2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 DIAGNOSTIC CODE INDEX DIAGNOSTIC CODE INDEX DTC Description C0010-01 LEFT FRONT INLET VALVE - GENERAL ELECTRICAL FAILURE C0011-01 LEFT FRONT OUTLET VALVE - GENERAL ELECTRICAL FAILURE C0014-01 RIGHT FRONT INLET VALVE - GENERAL ELECTRICAL FAILURE C0015-01 RIGHT FRONT OUTLET VALVE - GENERAL ELECTRICAL FAILURE C0018-01 LEFT REAR INLET VALVE - GENERAL ELECTRICAL FAILURE C0019-01 LEFT REAR OUTLET VALVE - GENERAL ELECTRICAL FAILURE C001C-01 RIGHT REAR INLET VALVE - GENERAL ELECTRICAL FAILURE C001D-01 RIGHT REAR OUTLET VALVE - GENERAL ELECTRICAL FAILURE C0020-49 RECIRCULATION PUMP - INTERNAL ELECTRONIC FAILURE C0030-29 LEFT FRONT TONE WHEEL - INVALID SIGNAL C0031-01 LEFT FRONT SPEED SENSOR - GENERAL ELECTRICAL FAILURE C0031-29 LEFT FRONT SPEED SENSOR - INVALID SIGNAL C0033-29 RIGHT FRONT TONE WHEEL - INVALID SIGNAL C0034-01 RIGHT FRONT SPEED SENSOR - GENERAL ELECTRICAL FAILURE C0034-29 RIGHT FRONT SPEED SENSOR - INVALID SIGNAL C0036-29 LEFT REAR TONE WHEEL - INVALID SIGNAL C0037-01 LEFT REAR SPEED SENSOR - GENERAL ELECTRICAL FAILURE C0037-29 LEFT REAR SPEED SENSOR - INVALID SIGNAL C0039-29 RIGHT REAR TONE WHEEL - INVALID SIGNAL C003A-01 RIGHT REAR SPEED SENSOR - GENERAL ELECTRICAL FAILURE C003A-29 RIGHT REAR SPEED SENSOR - INVALID SIGNAL C003B-29 WHEEL SPEED COMPARATIVE - INVALID SIGNAL C0047-01 BRAKE PRESSURE SENSOR - GENERAL ELECTRICAL FAILURE C0047-62 BRAKE PRESSURE SENSOR - SIGNAL COMPARE FAILURE C0051-29 STEERING ANGLE SENSOR (ESP) - INVALID SIGNAL C0051-54 STEERING ANGLE SENSOR (EPS) - MISSING CONFIGURED C0051-86 STEERING ANGLE SENSOR (EPS) - BUS SIGNAL INVALID C0061-29 LATERAL ACCELERATION SENSOR - INVALID SIGNAL C0061-86 LATERAL ACCELERATION SENSOR - BUS SIGNAL INVALID C0062-29 LONGITUDINAL ACCELERATION SENSOR - INVALID SIGNAL C0062-54 LONGITUDINAL ACCELERATION SENSOR - MISSING CALIBRATION C0062-86 LONGITUDINAL ACCELERATION SENSOR - BUS SIGNAL INVALID C0063-29 YAW RATE SENSOR - INVALID SIGNAL C0063-62 YAW RATE SENSOR - SIGNAL COMPARE FIGURE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 5002012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 DIAGNOSIS AND TESTING C0010-01-LEFT FRONT INLET VALVE - GENERAL ELECTRICAL FAILURE C0063-86 YAW RATE SENSOR - BUS SIGNAL INVALID C1115-16 VALVE SUPPLY VOLTAGE - BELOW THRESHOLD C1200-16 BATTERY VOLTAGE - BELOW THRESHOLD C1200-17 BATTERY VOLTAGE - ABOVE THRESHOLD C1205-49 VALVE RELAY - INTERNAL ELECTRONIC FAILURE C1206-01 PRIMING VALVE 1 - GENERAL ELECTRICAL FAILURE C1207-01 PRIMING VALVE 2 - GENERAL ELECTRICAL FAILURE C1208-01 PILOT VALVE 1 - GENERAL ELECTRICAL FAILURE C1209-01 PILOT VALVE 2 - GENERAL ELECTRICAL FAILURE C120A-24 ESC SWITCH - SIGNAL STUCK HIGH C1210-86 ABS/ESC LAMP COMMUNICATION - INVALID SIGNAL C1211-49 ABS INTERNAL ELECTRONIC FAILURE C1212-55 VARIANT CODING - NOT CONFIGURED C1213-54 EOL MISSING CALIBRATION C1213-55 EOL NOT CONFIGURED C1214-01 YAW/LATERAL/LONGITUDINAL SENSOR CLUSTER - GENERAL ELECTRICAL FAILURE C1215-24 BRAKE SWITCH - STUCK HIGH C1215-29 BRAKE LIGHT SWITCH - INVALID SIGNAL C1217-72 REVERSE GEAR SWITCH - ACTUATOR STUCK OPEN C1217-73 REVERSE GEAR SWITCH - ACTUATOR STUCK CLOSED C1218-4B VALVES ACTUATED TOO LONG BY TESTER - OVER TEMPERATURE C1219-16 PUMP SUPPLY VOLTAGE - BELOW THRESHOLD C1220-95 WHEEL SPEED SENSORS SWAPPED C1221-86 PCM BUS SIGNAL INVALID U0001-87 CAN-C BUS MISSING MESSAGE U0001-88 CAN-C BUS OFF U1700-86 IMPLAUSIBLE DATA RECEIVED FROM BCM U1700-87 LOST COMMUNICATION WITH BCM U1701-86 IMPLAUSIBLE DATA RECEIVED FROM PCM U1701-87 LOST COMMUNICATION WITH PCM U1702-86 ABS/EPS SIGNAL INVALID U1702-87 ABS/EPS MISSING MESSAGE U1711-86 IMPLAUSIBLE DATA RECEIVED FROM TCM U1711-87 LOST COMMUNICATION WITH TCM U1715-86 YAW RATE SENSOR SIGNAL INVALID U1715-87 YAW RATE SENSOR MISSING MESSAGE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage condition present. SET CONDITION: The Antilock Brake System (ABS) Module is unable to activate the correct solenoid valve. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read and record DTCs. 3. With the scan tool, read and record Freeze Fame information. 4. With the scan tool, erase DTCs. 5. Start the engine. 6. Press the brake pedal firmly and release. 7. With the scan tool, read and record DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. ANTI-LOCK BRAKE SYSTEM (ABS) 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Turn the ignition off to the lock position. 3. Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE HYDRAULIC CONTROL UNIT (HCU) NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 4. Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Replace the Hydraulic Control Unit (HCU) in accordance with the Service Information. Refer to HYDRAULIC CONTROL UNIT (HCU), REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C0011-01-LEFT FRONT OUTLET VALVE - GENERAL ELECTRICAL FAILURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage condition present. SET CONDITION: The Antilock Brake System (ABS) Module is unable to activate the correct solenoid valve. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE NOTE: For this failure it is necessary to replace both the ABS Module and the HCU as a complete unit. Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE HYDRAULIC CONTROL UNIT (HCU) NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Turn the ignition on. 2. With the scan tool, read and record DTCs. 3. With the scan tool, read and record Freeze Fame information. 4. With the scan tool, erase DTCs. 5. Start the engine. 6. Press the brake pedal firmly and release. 7. With the scan tool, read and record DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. ANTI-LOCK BRAKE SYSTEM (ABS) 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Turn the ignition off to the lock position. 3. Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. 4. Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Replace the Hydraulic Control Unit (HCU) in accordance with the Service Information. Refer to HYDRAULIC CONTROL UNIT (HCU), REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. NOTE: For this failure it is necessary to replace both the ABS Module and the HCU as a complete unit. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 C0014-01-RIGHT FRONT INLET VALVE - GENERAL ELECTRICAL FAILURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage condition present. SET CONDITION: The Antilock Brake System (ABS) Module is unable to activate the correct solenoid valve. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read and record DTCs. 3. With the scan tool, read and record Freeze Fame information. 4. With the scan tool, erase DTCs. 5. Start the engine. 6. Press the brake pedal firmly and release. 7. With the scan tool, read and record DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. ANTI-LOCK BRAKE SYSTEM (ABS) 1. Perform any Technical Service Bulletins (TSBs) that may apply. Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE HYDRAULIC CONTROL UNIT (HCU) NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 2. Turn the ignition off to the lock position. 3. Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. 4. Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Replace the Hydraulic Control Unit (HCU) in accordance with the Service Information. Refer to HYDRAULIC CONTROL UNIT (HCU), REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C0015-01-RIGHT FRONT OUTLET VALVE - GENERAL ELECTRICAL FAILURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage condition present. SET CONDITION: The Antilock Brake System (ABS) Module is unable to activate the correct solenoid valve. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE NOTE: For this failure it is necessary to replace both the ABS Module and the HCU as a complete unit. Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE HYDRAULIC CONTROL UNIT (HCU) 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Turn the ignition on. 2. With the scan tool, read and record DTCs. 3. With the scan tool, read and record Freeze Fame information. 4. With the scan tool, erase DTCs. 5. Start the engine. 6. Press the brake pedal firmly and release. 7. With the scan tool, read and record DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. ANTI-LOCK BRAKE SYSTEM (ABS) 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Turn the ignition off to the lock position. 3. Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. 4. Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Replace the Hydraulic Control Unit (HCU) in accordance with the Service Information. Refer to HYDRAULIC CONTROL UNIT (HCU), REMOVAL . NOTE: This DTC must be active for the results of this test to be valid. NOTE: For this failure it is necessary to replace both the ABS Module and the HCU as a complete unit. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C0018-01-LEFT REAR INLET VALVE - GENERAL ELECTRICAL FAILURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage condition present. SET CONDITION: The Antilock Brake System (ABS) Module is unable to activate the correct solenoid valve. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read and record DTCs. 3. With the scan tool, read and record Freeze Fame information. 4. With the scan tool, erase DTCs. 5. Start the engine. 6. Press the brake pedal firmly and release. 7. With the scan tool, read and record DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. ANTI-LOCK BRAKE SYSTEM (ABS) Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE HYDRAULIC CONTROL UNIT (HCU) NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Turn the ignition off to the lock position. 3. Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. 4. Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Replace the Hydraulic Control Unit (HCU) in accordance with the Service Information. Refer to HYDRAULIC CONTROL UNIT (HCU), REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C0019-01-LEFT REAR OUTLET VALVE - GENERAL ELECTRICAL FAILURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage condition present. SET CONDITION: The Antilock Brake System (ABS) Module is unable to activate the correct solenoid valve. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE NOTE: For this failure it is necessary to replace both the ABS Module and the HCU as a complete unit. Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE HYDRAULIC CONTROL UNIT (HCU) 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Turn the ignition on. 2. With the scan tool, read and record DTCs. 3. With the scan tool, read and record Freeze Fame information. 4. With the scan tool, erase DTCs. 5. Start the engine. 6. Press the brake pedal firmly and release. 7. With the scan tool, read and record DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. ANTI-LOCK BRAKE SYSTEM (ABS) 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Turn the ignition off to the lock position. 3. Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. 4. Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Replace the Hydraulic Control Unit (HCU) in accordance with the Service Information. Refer to HYDRAULIC CONTROL UNIT (HCU), REMOVAL . NOTE: This DTC must be active for the results of this test to be valid. NOTE: For this failure it is necessary to replace both the ABS Module and the HCU as a complete unit. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C001C-01-RIGHT REAR INLET VALVE - GENERAL ELECTRICAL FAILURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage condition present. SET CONDITION: The Antilock Brake System (ABS) Module is unable to activate the correct solenoid valve. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read and record DTCs. 3. With the scan tool, read and record Freeze Fame information. 4. With the scan tool, erase DTCs. 5. Start the engine. 6. Press the brake pedal firmly and release. 7. With the scan tool, read and record DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. ANTI-LOCK BRAKE SYSTEM (ABS) Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE HYDRAULIC CONTROL UNIT (HCU) NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Turn the ignition off to the lock position. 3. Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. 4. Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Replace the Hydraulic Control Unit (HCU) in accordance with the Service Information. Refer to HYDRAULIC CONTROL UNIT (HCU), REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C001D-01-RIGHT REAR OUTLET VALVE - GENERAL ELECTRICAL FAILURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage condition present. SET CONDITION: The Antilock Brake System (ABS) Module is unable to activate the correct solenoid valve. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE NOTE: For this failure it is necessary to replace both the ABS Module and the HCU as a complete unit. Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE HYDRAULIC CONTROL UNIT (HCU) 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Turn the ignition on. 2. With the scan tool, read and record DTCs. 3. With the scan tool, read and record Freeze Fame information. 4. With the scan tool, erase DTCs. 5. Start the engine. 6. Press the brake pedal firmly and release. 7. With the scan tool, read and record DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. ANTI-LOCK BRAKE SYSTEM (ABS) 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Turn the ignition off to the lock position. 3. Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. 4. Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Replace the Hydraulic Control Unit (HCU) in accordance with the Service Information. Refer to HYDRAULIC CONTROL UNIT (HCU), REMOVAL . NOTE: This DTC must be active for the results of this test to be valid. NOTE: For this failure it is necessary to replace both the ABS Module and the HCU as a complete unit. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C0020-49-RECIRCULATION PUMP - INTERNAL ELECTRONIC FAILURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage condition present. SET CONDITION: The Antilock Brake System (ABS) Module has detected an internal failure for the pump being stuck or is damaged. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read and record DTCs. 3. With the scan tool, read and record Freeze Fame information. 4. With the scan tool, erase DTCs. 5. Start the engine. 6. Press the brake pedal firmly and release. 7. With the scan tool, read and record DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE HYDRAULIC CONTROL UNIT (HCU) NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 2. ANTI-LOCK BRAKE SYSTEM (ABS) 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Turn the ignition off to the lock position. 3. Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. 4. Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Replace the Hydraulic Control Unit (HCU) in accordance with the Service Information. Refer to HYDRAULIC CONTROL UNIT (HCU), REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C0030-29-LEFT FRONT TONE WHEEL - INVALID SIGNAL For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no overvoltage or undervoltage is present. SET CONDITION: When the Anti-Lock Brake Module detects periodic drops of a WSS signal. POSSIBLE CAUSES NOTE: For this failure it is necessary to replace both the ABS Module and the HCU as a complete unit. Possible Causes IMPROPER LEFT FRONT TIRE PRESSURE/MISMATCHED TIRES TONE WHEEL/ BEARING DAMAGE LEFT FRONT WHEEL SPEED SENSOR ANTI-LOCK BRAKE SYSTEM (ABS) MODULE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, record and erase DTCs. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. CHECK WHEEL SPEED SENSOR SIGNALS 1. Turn the ignition on. 2. With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant drives the vehicle. 3. Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph). Is the Left Front WSS speed showing 0 km/h (0 mph) or not matching other wheels or showing erratic behavior? NOTE: If DTC C0030-01 is present it must be repaired before continuing with this diagnostic procedure. NOTE: This DTC must be active for the results of this test to be valid. CAUTION: Make sure brake capability is available before road testing. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. NOTE: If graph shows periodic dropouts pay close attention to the tone wheel. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Yes  Go To 3. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 3. CHECK FOR IMPROPER TIRE PRESSURE/MISMATCHED TIRES 1. Turn the ignition off. 2. Check and adjust the Left Front Tire pressure. 3. Check and adjust all other tire pressures. 4. Inspect for mismatched tires on vehicle. Is the tire improperly inflated or mismatched tires on vehicle? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 4. 4. CHECK LEFT FRONT WHEEL BEARING FOR DAMAGE 1. Inspect the Left Front wheel bearing for excessive runout or clearance. Is the Left Front Wheel Bearing Damaged? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 5. 5. LEFT FRONT WHEEL SPEED SENSOR 1. Replace the Left Front Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL . 2. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. NOTE: Refer to the appropriate service information, if necessary, for procedures or specifications. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read the ABS DTCs. Does the DTC remain active? Yes  Replace the Anti-Lock Brakes Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test Complete. C0031-01-LEFT FRONT SPEED SENSOR - GENERAL ELECTRICAL FAILURE CAUTION: Make sure brake capability is available before road testing. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 1: Wheel Speed Sensor Wiring Diagram Courtesy of CHRYSLER GROUP, LLC For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage or over voltage condition present. SET CONDITION: 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 When the Left Front Wheel Speed Sensor circuit fails the diagnostic test. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Ignition on, engine not running. 2. With the scan tool, erase DTCs. 3. Cycle the ignition switch from off to on. 4. With the scan tool, select View DTCs. Is the DTC active at this time? Yes  Go To 2. No  The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. CHECK CONNECTOR/TERMINAL FOR DAMAGE 1. Turn the ignition off to the lock position. 2. Inspect the Wheel Speed Sensor for proper mounting. Possible Causes WHEEL SPEED SENSOR CONNECTOR/TERMINAL DAMAGE (B8) LEFT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE (B9) LEFT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE (B8) LEFT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND (B9) LEFT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO GROUND (B8) LEFT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN (B9) LEFT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR AN OPEN (B9) LEFT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO THE (B8) LEFT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT LEFT FRONT WHEEL SPEED SENSOR ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: Check all terminals for broken, bent, pushed out, or corroded terminals. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 3. Inspect the Wheel Speed Sensor harness and connector. 4. Inspect the Wheel Speed Sensor for excessive debris on the sensor. Were any problems found? Yes  Repair as necessary in accordance with the Service Information.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 3. 3. CHECK (B9) LEFT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT VOLTAGE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 2: Measuring Left Front Wheel Speed Sensor Supply Circuit Voltage Courtesy of CHRYSLER GROUP, LLC 1. Disconnect the Left Front Wheel Speed Sensor harness connector. 2. Turn the ignition on. 3. Measure the voltage between the (B9) Left Front Wheel Speed Sensor Supply circuit and ground. Is the voltage above 10 volts? Yes  Go To 6. No  Go To 4. 4. (B9) LEFT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO GROUND 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 3: Checking Left Front Wheel Speed Sensor Supply Circuit For A Short To Ground Courtesy of CHRYSLER GROUP, LLC 1. Turn the ignition off. 2. Disconnect the ABS Module harness connector. 3. Measure the resistance between the (B9) Left Front Wheel Speed Sensor Supply circuit and ground. Is the resistance below 5.0 Ohms? Yes  Repair the (B9) Left Front Wheel Speed Sensor Supply circuit for a short to ground.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Go To 5. 5. (B9) LEFT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR AN OPEN 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 4: Checking Left Front Wheel Speed Sensor Supply Circuit For An Open Courtesy of CHRYSLER GROUP, LLC 1. Measure the resistance of the (B9) Left Front Wheel Speed Sensor Supply circuit between the Left Front Wheel Speed Sensor harness connector and the ABS harness connector. Is the resistance below 5 Ohms? Yes  Go To 6. No  Repair the open (B9) Left Front Wheel Speed Sensor Supply circuit.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 6. (B8) LEFT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 5: Checking Left Front Wheel Speed Sensor Signal Circuit For A Short To Voltage Courtesy of CHRYSLER GROUP, LLC 1. Turn the ignition on. 2. Measure the voltage of the (B8) Left Front Wheel Speed Sensor Signal circuit at the Left Front Wheel Speed Sensor harness connector. Is there any voltage present? Yes  Repair the (B8) Left Front Wheel Speed Sensor Signal circuit for a short to voltage.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 7. 7. (B8) LEFT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 6: Checking Left Front Wheel Speed Sensor Signal Circuit For A Short To Ground Courtesy of CHRYSLER GROUP, LLC 1. Turn the ignition off. 2. Measure the resistance between the (B8) Left Front Wheel Speed Sensor Signal circuit and ground. Is the resistance below 5.0 Ohms? Yes  Repair the (B8) Left Front Wheel Speed Sensor Signal circuit for a short to ground.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 8. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 8. (B8) LEFT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN Fig. 7: Checking Left Front Wheel Speed Sensor Signal Circuit For An Open Courtesy of CHRYSLER GROUP, LLC 1. Measure the resistance of the (B8) Left Front Wheel Speed Sensor Signal circuit between the Left Front Wheel Speed Sensor harness connector and the ABS harness connector. Is the resistance below 5 Ohms? Yes 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Go To 9. No  Repair the open (B8) Left Front Wheel Speed Sensor Signal circuit.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 9. (B9) LEFT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO THE (B8) LEFT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT Fig. 8: Checking Left Front Wheel Speed Sensor Supply Circuit For A Short To The Left Front Wheel Speed Sensor Signal Circuit Courtesy of CHRYSLER GROUP, LLC 1. Turn the ignition off to the lock position. 2. Measure the resistance between the (B9) Left Front Wheel Speed Sensor Supply circuit and the (B8) Left Front Wheel Speed Sensor Signal circuit at the ABS Module harness connector. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Is the resistance below 5.0 Ohms? Yes  Repair (B9) Left Front Wheel Speed Sensor Supply circuit for a short to the (B8) Left Front Wheel Speed Sensor Signal circuit.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 10. 10. LEFT FRONT WHEEL SPEED SENSOR 1. Replace the Left Front Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL . 2. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read ABS DTCs. Does the remain active at this DTC? Yes  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. C0031-29-LEFT FRONT SPEED SENSOR - INVALID SIGNAL CAUTION: Make sure brake capability is available before road testing. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be meet. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 9: Wheel Speed Sensor Wiring Diagram Courtesy of CHRYSLER GROUP, LLC For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage or over voltage condition present. SET CONDITION: 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 When the Antilock Brake System (ABS) Module detects multiple drastic changes in Left Front wheel speed. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, record and erase DTCs. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read DTCs. Is the DTC active at this time? Yes  Go To 3. No  Go To 2. 2. CHECK WHEEL SPEED SENSOR SIGNALS 1. Turn the ignition on. 2. With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant drives the vehicle. Possible Causes CHECK LEFT FRONT WHEEL SPEED SENSOR FOR LOOSENESS INSPECT CIRCUITS/CONNECTOR/TERMINALS FOR DAMAGE LEFT FRONT WHEEL BEARING AND HUB OR ENCODER FOR DAMAGE LEFT FRONT WHEEL SPEED SENSOR ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: If DTC C0031-01 is present, perform the diagnostics for this DTC before continuing with this diagnostic procedure. CAUTION: Make sure brake capability is available before road testing. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 3. Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph). Is the Left Front WSS speed showing 0 km/h (0 mph), not matching other wheels, or showing erratic behavior? Yes  Go To 3. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 3. CHECK LEFT FRONT WSS FOR LOOSENESS, INSPECT CIRCUITS/CONNECTORS/TERMINALS FOR DAMAGE 1. Turn the ignition off to the lock position. 2. Inspect the ABS Module harness connector and the Left Front WSS harness connector. 3. Check the Left Front WSS for looseness, excessive corrosion and not properly fastened. 4. Inspect the (B8) Left Front WSS Signal and (B9) Left Front WSS Supply circuits between the Left Front WSS and Anti-Lock Brake Module for damage. Is the Left Front WSS loose or any of the wiring/connectors/terminals damaged? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 4. 4. CHECK LEFT FRONT WHEEL SPEED SENSOR FOR DAMAGE 1. Remove the Left Front Wheel Speed Sensor. 2. Inspect the Wheel Speed Sensor for proper mounting. 3. Inspect the Wheel Speed Sensor harness and connector. 4. Inspect the Wheel Speed Sensor for excessive debris on the sensor. Is the Left Front Wheel Speed Sensor damaged? NOTE: If graph shows periodic dropouts pay close attention to the tone wheel. NOTE: Check all terminals for broken, bent, pushed out, or corroded terminals. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Yes  Replace the Left Front Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 5. 5. CHECK LEFT FRONT WHEEL BEARING AND HUB OR ENCODER FOR DAMAGE 1. Inspect the Left Front wheel bearing, hub and Encoder for excessive runout, clearance or damage. Is the Left Front Wheel Bearing, Hub or Encoder Damaged? Yes  Replace the Hub and Wheel Bearing in accordance with the Service Information. Refer to HUB AND BEARING, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 6. 6. LEFT FRONT WHEEL SPEED SENSOR 1. Replace the Left Front Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL . 2. Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read ABS DTCs. Does the DTC remain active? Yes  Replace the Anti-Lock Brakes Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. NOTE: Refer to the appropriate service information, if necessary, for procedures or specifications. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 No  Test Complete. C0033-29-RIGHT FRONT TONE WHEEL - INVALID SIGNAL For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no overvoltage or undervoltage is present. SET CONDITION: When the Anti-Lock Brake Module detects periodic drops of a WSS signal. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, record and erase DTCs. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read DTCs. Possible Causes IMPROPER RIGHT FRONT TIRE PRESSURE/MISMATCHED TIRES TONE WHEEL/ BEARING DAMAGE RIGHT FRONT WHEEL SPEED SENSOR ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: If DTC C0034-01 is present it must be repaired before continuing with this diagnostic procedure. NOTE: This DTC must be active for the results of this test to be valid. CAUTION: Make sure brake capability is available before road testing. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. CHECK WHEEL SPEED SENSOR SIGNALS 1. Turn the ignition on. 2. With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant drives the vehicle. 3. Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph). Is the Right Front WSS speed showing 0 km/h (0 mph) or not matching other wheels or showing erratic behavior? Yes  Go To 3. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 3. CHECK FOR IMPROPER TIRE PRESSURE/MISMATCHED TIRES 1. Turn the ignition off. 2. Check and adjust the Right Front Tire pressure. 3. Check and adjust all other tire pressures. 4. Inspect for mismatched tires on vehicle. Is the tire improperly inflated or mismatched tires on vehicle? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No NOTE: If graph shows periodic dropouts pay close attention to the tone wheel. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Go To 4. 4. CHECK RIGHT REAR WHEEL BEARING FOR DAMAGE 1. Inspect the Right Front wheel bearing for excessive runout or clearance. Is the Right Front Wheel Bearing Damaged? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 5. 5. RIGHT FRONT WHEEL SPEED SENSOR 1. Replace the Right Front Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL . 2. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read the ABS DTCs. Does the DTC remain active? Yes  Replace the Anti-Lock Brakes Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test Complete. NOTE: Refer to the appropriate service information, if necessary, for procedures or specifications. CAUTION: Make sure brake capability is available before road testing. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 C0034-01-RIGHT FRONT SPEED SENSOR - GENERAL ELECTRICAL FAILURE Fig. 10: Wheel Speed Sensor Wiring Diagram Courtesy of CHRYSLER GROUP, LLC For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage or over voltage condition present. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 SET CONDITION: When the Right Front Wheel Speed Sensor circuit fails the diagnostic test. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Ignition on, engine not running. 2. With the scan tool, erase DTCs. 3. Cycle the ignition switch from off to on. 4. With the scan tool, select View DTCs. Is the DTC active at this time? Yes  Go To 2. No  The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. CHECK CONNECTOR/TERMINAL FOR DAMAGE Possible Causes WHEEL SPEED SENSOR CONNECTOR/TERMINAL DAMAGE (B6) RIGHT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE (B7) RIGHT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE (B6) RIGHT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND (B7) RIGHT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO GROUND (B6) RIGHT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN (B7) RIGHT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR AN OPEN (B7) RIGHT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO THE (B6) RIGHT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT RIGHT FRONT WHEEL SPEED SENSOR ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: Check all terminals for broken, bent, pushed out, or corroded terminals. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Turn the ignition off to the lock position. 2. Inspect the Wheel Speed Sensor for proper mounting. 3. Inspect the Wheel Speed Sensor harness and connector. 4. Inspect the Wheel Speed Sensor for excessive debris on the sensor. Were any problems found? Yes  Repair as necessary in accordance with the Service Information.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 3. 3. CHECK (B7) RIGHT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT VOLTAGE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 11: Measuring Left Front Wheel Speed Sensor Supply Circuit Voltage Courtesy of CHRYSLER GROUP, LLC 1. Disconnect the Right Front Wheel Speed Sensor harness connector. 2. Turn the ignition on. 3. Measure the voltage between the (B7) Right Front Wheel Speed Sensor Supply circuit and ground. Is the voltage above 10 volts? Yes  Go To 6. No 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Go To 4. 4. (B7) RIGHT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO GROUND Fig. 12: Checking Left Front Wheel Speed Sensor Supply Circuit For A Short To Ground Courtesy of CHRYSLER GROUP, LLC 1. Turn the ignition off. 2. Disconnect the ABS Module harness connector. 3. Measure the resistance between the (B7) Right Front Wheel Speed Sensor Supply circuit and ground. Is the resistance below 5.0 Ohms? Yes  Repair the (B7) Right Front Wheel Speed Sensor Supply circuit for a short to ground. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 5. 5. (B7) RIGHT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR AN OPEN 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 13: Checking Right Front Wheel Speed Sensor Supply Circuit For An Open Courtesy of CHRYSLER GROUP, LLC 1. Measure the resistance of the (B7) Right Front Wheel Speed Sensor Supply circuit between the 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Right Front Wheel Speed Sensor harness connector and the ABS harness connector. Is the resistance below 5 Ohms? Yes  Go To 6. No  Repair the open (B7) Right Front Wheel Speed Sensor Supply circuit.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 6. (B6) RIGHT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Fig. 14: Checking Left Front Wheel Speed Sensor Signal Circuit For A Short To Voltage Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Turn the ignition on. 2. Measure the voltage of the (B6) Right Front Wheel Speed Sensor Signal circuit at the Right Front Wheel Speed Sensor harness connector. Is there any voltage present? Yes  Repair the (B6) Right Front Wheel Speed Sensor Signal circuit for a short to voltage.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 7. 7. (B6) RIGHT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 15: Checking Left Front Wheel Speed Sensor Signal Circuit For A Short To Ground Courtesy of CHRYSLER GROUP, LLC 1. Turn the ignition off. 2. Measure the resistance between the (B6) Right Front Wheel Speed Sensor Signal circuit and ground. Is the resistance below 5.0 Ohms? Yes  Repair the (B6) Right Front Wheel Speed Sensor Signal circuit for a short to ground.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 8. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 8. (B6) RIGHT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN Fig. 16: Checking Right Front Wheel Speed Sensor Signal Circuit For An Open Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Measure the resistance of the (B6) Right Front Wheel Speed Sensor Signal circuit between the Right Front Wheel Speed Sensor harness connector and the ABS harness connector. Is the resistance below 5 Ohms? Yes  Go To 9. No  Repair the open (B6) Right Front Wheel Speed Sensor Signal circuit.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 9. (B7) RIGHT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO THE (B6) RIGHT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 17: Checking Left Front Wheel Speed Sensor Supply Circuit For A Short To The Left Front Wheel Speed Sensor Signal Circuit Courtesy of CHRYSLER GROUP, LLC 1. Turn the ignition off to the lock position. 2. Measure the resistance between the (B7) Right Front Wheel Speed Sensor Supply circuit and the (B6) Right Front Wheel Speed Sensor Signal circuit at the ABS Module harness connector. Is the resistance below 5.0 Ohms? Yes  Repair (B7) Right Front Wheel Speed Sensor Supply circuit for a short to the (B6) Right Front Wheel Speed Sensor Signal circuit.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 10. 10. RIGHT FRONT WHEEL SPEED SENSOR 1. Replace the Right Front Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL . 2. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read ABS DTCs. Is the status Active for this DTC? Yes  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. CAUTION: Make sure brake capability is available before road testing. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be meet. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 C0034-29-RIGHT FRONT SPEED SENSOR - INVALID SIGNAL Fig. 18: Wheel Speed Sensor Wiring Diagram Courtesy of CHRYSLER GROUP, LLC For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage or over voltage condition present. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 SET CONDITION: When the Antilock Brake System (ABS) Module detects multiple drastic changes in Left Front wheel speed. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, record and erase DTCs. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read DTCs. Is the DTC active at this time? Yes  Go To 3. No Possible Causes CHECK RIGHT FRONT WHEEL SPEED SENSOR FOR LOOSENESS INSPECT CIRCUITS/CONNECTOR/TERMINALS FOR DAMAGE RIGHT FRONT WHEEL BEARING AND HUB OR ENCODER FOR DAMAGE RIGHT FRONT WHEEL SPEED SENSOR ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: If DTC C0034-01 is present, perform the diagnostics for this DTC before continuing with this diagnostic procedure. NOTE: If DTC C0034-1D is present, perform the diagnostics for this DTC before continuing with this diagnostic procedure. CAUTION: Make sure brake capability is available before road testing. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Go To 2. 2. CHECK WHEEL SPEED SENSOR SIGNALS 1. Turn the ignition on. 2. With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant drives the vehicle. 3. Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph). Is the Right Front WSS speed showing 0 km/h (0 mph), not matching other wheels, or showing erratic behavior? Yes  Go To 3. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 3. CHECK RIGHT FRONT WSS FOR LOOSENESS, INSPECT CIRCUITS/CONNECTORS/TERMINALS FOR DAMAGE 1. Turn the ignition off to the lock position. 2. Inspect the ABS Module harness connector and the Right Front WSS harness connector. 3. Check the Right Front WSS for looseness, excessive corrosion and not properly fastened. 4. Inspect the (B6) Right Front WSS Signal and (B7) Right Front WSS Supply circuits between the Right Front WSS and Anti-Lock Brake Module for damage. Is the Right Front WSS loose or any of the wiring/connectors/terminals damaged? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 4. 4. CHECK RIGHT FRONT WHEEL SPEED SENSOR FOR DAMAGE NOTE: If graph shows periodic dropouts pay close attention to the tone wheel. NOTE: Check all terminals for broken, bent, pushed out, or corroded terminals. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Remove the Right Front Wheel Speed Sensor. 2. Inspect the Wheel Speed Sensor for proper mounting. 3. Inspect the Wheel Speed Sensor harness and connector. 4. Inspect the Wheel Speed Sensor for excessive debris on the sensor. Is the Right Front Wheel Speed Sensor damaged? Yes  Replace the Right Front Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 5. 5. CHECK RIGHT FRONT WHEEL BEARING AND HUB OR ENCODER FOR DAMAGE 1. Inspect the Right Front wheel bearing, hub and Encoder for excessive runout, clearance or damage. Is the Right Front Wheel Bearing, Hub or Encoder Damaged? Yes  Replace the Hub and Wheel Bearing in accordance with the Service Information. Refer to HUB AND BEARING, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 6. 6. RIGHT FRONT WHEEL SPEED SENSOR 1. Replace the Right Front Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL . 2. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read ABS DTCs. NOTE: Refer to the appropriate service information, if necessary, for procedures or specifications. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Does the DTC remain active? Yes  Replace the Anti-Lock Brakes Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test Complete. C0036-29-LEFT REAR TONE WHEEL - INVALID SIGNAL For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no overvoltage or undervoltage is present. SET CONDITION: When the Anti-Lock Brake Module detects periodic drops of a WSS signal. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, record and erase DTCs. Possible Causes IMPROPER LEFT REAR TIRE PRESSURE/MISMATCHED TIRES TONE WHEEL/ BEARING DAMAGE LEFT REAR WHEEL SPEED SENSOR ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: If DTC C0037-01 is present it must be repaired before continuing with this diagnostic procedure. NOTE: This DTC must be active for the results of this test to be valid. CAUTION: Make sure brake capability is available before road testing. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. CHECK WHEEL SPEED SENSOR SIGNALS 1. Turn the ignition on. 2. With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant drives the vehicle. 3. Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph). Is the Left Rear WSS speed showing 0 km/h (0 mph) or not matching other wheels or showing erratic behavior? Yes  Go To 3. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 3. CHECK FOR IMPROPER TIRE PRESSURE/MISMATCHED TIRES 1. Turn the ignition off. 2. Check and adjust the Left Rear Tire pressure. 3. Check and adjust all other tire pressures. 4. Inspect for mismatched tires on vehicle. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. NOTE: If graph shows periodic dropouts pay close attention to the tone wheel. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Is the tire improperly inflated or mismatched tires on vehicle? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 4. 4. CHECK LEFT REAR WHEEL BEARING FOR DAMAGE 1. Inspect the Left Rear wheel bearing for excessive runout or clearance. Is the Left Rear Wheel Bearing Damaged? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 5. 5. LEFT REAR WHEEL SPEED SENSOR 1. Replace the Left Rear Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, REAR, REMOVAL . 2. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read the ABS DTCs. Does the DTC remain active? Yes NOTE: Refer to the appropriate service information, if necessary, for procedures or specifications. CAUTION: Make sure brake capability is available before road testing. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Replace the Anti-Lock Brakes Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test Complete. C0037-01-LEFT REAR SPEED SENSOR - GENERAL ELECTRICAL FAILURE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 19: Wheel Speed Sensor Wiring Diagram Courtesy of CHRYSLER GROUP, LLC For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage or over voltage condition present. SET CONDITION: When the Left Rear Wheel Speed Sensor circuit fails the diagnostic test. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Ignition on, engine not running. 2. With the scan tool, erase DTCs. 3. Cycle the ignition switch from off to on. 4. With the scan tool, select View DTCs. Is the DTC active at this time? Yes  Go To 2. No  The condition that caused the symptom is currently not present. Inspect the related wiring for Possible Causes WHEEL SPEED SENSOR CONNECTOR/TERMINAL DAMAGE (B3) LEFT REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE (B4) LEFT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE (B3) LEFT REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO GROUND (B4) LEFT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND (B3) LEFT REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR AN OPEN (B4) LEFT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN (B4) LEFT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO THE (B3) LEFT REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT LEFT REAR WHEEL SPEED SENSOR ANTI-LOCK BRAKE SYSTEM (ABS) MODULE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. CHECK CONNECTOR/TERMINAL FOR DAMAGE 1. Turn the ignition off to the lock position. 2. Inspect the Wheel Speed Sensor for proper mounting. 3. Inspect the Wheel Speed Sensor harness and connector. 4. Inspect the Wheel Speed Sensor for excessive debris on the sensor. Were any problems found? Yes  Repair as necessary in accordance with the Service Information.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 3. 3. CHECK (B4) LEFT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT VOLTAGE NOTE: Check all terminals for broken, bent, pushed out, or corroded terminals. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 20: Measuring Left Front Wheel Speed Sensor Supply Circuit Voltage Courtesy of CHRYSLER GROUP, LLC 1. Disconnect the Left Rear Wheel Speed Sensor harness connector. 2. Turn the ignition on. 3. Measure the voltage between the (B4) Left Rear Wheel Speed Sensor Signal circuit and ground. Is the voltage above 10 volts? Yes  Go To 6. No 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Go To 4. 4. (B4) LEFT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Fig. 21: Checking Left Front Wheel Speed Sensor Supply Circuit For A Short To Ground Courtesy of CHRYSLER GROUP, LLC 1. Turn the ignition off. 2. Disconnect the ABS Module harness connector. 3. Measure the resistance between the (B4) Left Rear Wheel Speed Sensor Signal circuit and ground. Is the resistance below 5.0 Ohms? Yes  Repair the (B4) Left Rear Wheel Speed Sensor Signal circuit for a short to ground.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 No  Go To 5. 5. (B4) LEFT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 22: Checking Left Rear Wheel Speed Sensor Signal Circuit For An Open Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Measure the resistance of the (B4) Left Rear Wheel Speed Sensor Signal circuit between the Left Rear Wheel Speed Sensor harness connector and the ABS harness connector. Is the resistance below 5 Ohms? Yes  Go To 6. No  Repair the open (B4) Left Rear Wheel Speed Sensor Signal circuit.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 6. (B3) LEFT REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE Fig. 23: Checking Left Front Wheel Speed Sensor Signal Circuit For A Short To Voltage Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Turn the ignition on. 2. Measure the voltage of the (B3) Left Rear Wheel Speed Sensor Supply circuit at the Left Rear Wheel Speed Sensor harness connector. Is there any voltage present? Yes  Repair the (B3) Left Rear Wheel Speed Sensor Supply circuit for a short to voltage.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 7. 7. (B3) LEFT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 24: Checking Left Front Wheel Speed Sensor Signal Circuit For A Short To Ground Courtesy of CHRYSLER GROUP, LLC 1. Turn the ignition off. 2. Measure the resistance between the (B3) Left Rear Wheel Speed Sensor Supply circuit and ground. Is the resistance below 5.0 Ohms? Yes  Repair the (B3) Left Rear Wheel Speed Sensor Supply circuit for a short to ground.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 8. 8. (B3) LEFT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 25: Checking Left Rear Wheel Speed Sensor Signal Circuit For An Open Courtesy of CHRYSLER GROUP, LLC 1. Measure the resistance of the (B3) Left Rear Wheel Speed Sensor Supply circuit between the Left 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Rear Wheel Speed Sensor harness connector and the ABS harness connector. Is the resistance below 5 Ohms? Yes  Go To 9. No  Repair the open (B3) Left Rear Wheel Speed Sensor Supply circuit.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 9. (B4) LEFT REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO THE (B3) LEFT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT Fig. 26: Checking Left Front Wheel Speed Sensor Supply Circuit For A Short To The Left Front 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Wheel Speed Sensor Signal Circuit Courtesy of CHRYSLER GROUP, LLC 1. Turn the ignition off to the lock position. 2. Measure the resistance between the (B3) Left Rear Wheel Speed Sensor Supply circuit and the (B4) Left Rear Wheel Speed Sensor Signal circuit at the ABS Module harness connector. Is the resistance below 5.0 Ohms? Yes  Repair (B3) Left Rear Wheel Speed Sensor Supply circuit for a short to the (B4) Left Rear Wheel Speed Sensor Signal circuit.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 10. 10. LEFT REAR WHEEL SPEED SENSOR 1. Replace the Left Rear Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL . 2. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read ABS DTCs. Is the status Active for this DTC? Yes  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. CAUTION: Make sure brake capability is available before road testing. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be meet. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 C0037-29-LEFT REAR SPEED SENSOR - INVALID SIGNAL Fig. 27: Wheel Speed Sensor Wiring Diagram Courtesy of CHRYSLER GROUP, LLC For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage or over voltage condition present. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 SET CONDITION: When the Antilock Brake System (ABS) Module detects multiple drastic changes in Left Front wheel speed. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, record and erase DTCs. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read DTCs. Is the DTC active at this time? Yes  Go To 3. No  Go To 2. 2. CHECK WHEEL SPEED SENSOR SIGNALS 1. Turn the ignition on. 2. With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant Possible Causes CHECK LEFT REAR WHEEL SPEED SENSOR FOR LOOSENESS INSPECT CIRCUITS/CONNECTOR/TERMINALS FOR DAMAGE LEFT REAR WHEEL BEARING AND HUB OR ENCODER FOR DAMAGE LEFT REAR WHEEL SPEED SENSOR ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: If DTC C0037-01 is present, perform the diagnostics for this DTC before continuing with this diagnostic procedure. CAUTION: Make sure brake capability is available before road testing. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 drives the vehicle. 3. Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph). Is the Left Rear WSS speed showing 0 km/h (0 mph), not matching other wheels, or showing erratic behavior? Yes  Go To 3. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 3. CHECK LEFT REAR WSS FOR LOOSENESS, INSPECT CIRCUITS/CONNECTORS/TERMINALS FOR DAMAGE 1. Turn the ignition off to the lock position. 2. Inspect the ABS Module harness connector and the Left Rear WSS harness connector. 3. Check the Left Rear WSS for looseness, excessive corrosion and not properly fastened. 4. Inspect the (B3) Left Rear WSS Signal and (B4) Left Rear WSS Supply circuits between the Left Rear WSS and Anti-Lock Brake Module for damage. Is the Left Rear WSS loose or any of the wiring/connectors/terminals damaged? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 4. 4. CHECK LEFT REAR WHEEL SPEED SENSOR FOR DAMAGE 1. Remove the Left Rear Wheel Speed Sensor. 2. Inspect the Wheel Speed Sensor for proper mounting. 3. Inspect the Wheel Speed Sensor harness and connector. 4. Inspect the Wheel Speed Sensor for excessive debris on the sensor. NOTE: If graph shows periodic dropouts pay close attention to the tone wheel. NOTE: Check all terminals for broken, bent, pushed out, or corroded terminals. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Is the Left Rear Wheel Speed Sensor damaged? Yes  Replace the Left Rear Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 5. 5. CHECK LEFT REAR WHEEL BEARING AND HUB OR ENCODER FOR DAMAGE 1. Inspect the Left Rear wheel bearing, hub and Encoder for excessive runout, clearance or damage. Is the Left Rear Wheel Bearing, Hub or Encoder Damaged? Yes  Replace the Hub and Wheel Bearing in accordance with the Service Information. Refer to HUB AND BEARING, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 6. 6. LEFT REAR WHEEL SPEED SENSOR 1. Replace the Left Rear Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL . 2. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read ABS DTCs. Does the DTC remain active? Yes  Replace the Anti-Lock Brakes Module in accordance with the Service Information. Refer to NOTE: Refer to the appropriate service information, if necessary, for procedures or specifications. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test Complete. C0039-29-RIGHT REAR TONE WHEEL - INVALID SIGNAL For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no overvoltage or undervoltage is present. SET CONDITION: When the Anti-Lock Brake Module detects periodic drops of a WSS signal. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, record and erase DTCs. 3. Road test the vehicle over 40 km/h (25 mph). Possible Causes IMPROPER RIGHT REAR TIRE PRESSURE/MISMATCHED TIRES TONE WHEEL/ BEARING DAMAGE RIGHT REAR WHEEL SPEED SENSOR ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: If DTC C003A-01 is present it must be repaired before continuing with this diagnostic procedure. NOTE: This DTC must be active for the results of this test to be valid. CAUTION: Make sure brake capability is available before road testing. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 4. With the scan tool, read DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. CHECK WHEEL SPEED SENSOR SIGNALS 1. Turn the ignition on. 2. With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant drives the vehicle. 3. Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph). Is the Right Rear WSS speed showing 0 km/h (0 mph) or not matching other wheels or showing erratic behavior? Yes  Go To 3. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 3. CHECK FOR IMPROPER TIRE PRESSURE/MISMATCHED TIRES 1. Turn the ignition off. 2. Check and adjust the Right Rear Tire pressure. 3. Check and adjust all other tire pressures. 4. Inspect for mismatched tires on vehicle. Is the tire improperly inflated or mismatched tires on vehicle? NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. NOTE: If graph shows periodic dropouts pay close attention to the tone wheel. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 4. 4. CHECK RIGHT REAR WHEEL BEARING FOR DAMAGE 1. Inspect the Right Rear wheel bearing for excessive runout or clearance. Is the Right Rear Wheel Bearing Damaged? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 5. 5. RIGHT REAR WHEEL SPEED SENSOR 1. Replace the Right Rear Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, REAR, REMOVAL . 2. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read the ABS DTCs. Does the DTC remain active? Yes  Replace the Anti-Lock Brakes Module in accordance with the Service Information. Refer to NOTE: Refer to the appropriate service information, if necessary, for procedures or specifications. CAUTION: Make sure brake capability is available before road testing. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test Complete. C003A-01-RIGHT REAR SPEED SENSOR - GENERAL ELECTRICAL FAILURE Fig. 28: Wheel Speed Sensor Wiring Diagram 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Courtesy of CHRYSLER GROUP, LLC For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage or over voltage condition present. SET CONDITION: When the Right Rear Wheel Speed Sensor circuit fails the diagnostic test. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Ignition on, engine not running. 2. With the scan tool, erase DTCs. 3. Cycle the ignition switch from off to on. 4. With the scan tool, select View DTCs. Is the DTC active at this time? Yes  Go To 2. No  The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken Possible Causes WHEEL SPEED SENSOR CONNECTOR/TERMINAL DAMAGE (B1) RIGHT REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE (B2) RIGHT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE (B1) RIGHT REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO GROUND (B2) RIGHT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND (B1) RIGHT REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR AN OPEN (B2) RIGHT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN (B2) RIGHT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO THE (B1) RIGHT REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT RIGHT REAR WHEEL SPEED SENSOR ANTI-LOCK BRAKE SYSTEM (ABS) MODULE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 wires.  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. CHECK CONNECTOR/TERMINAL FOR DAMAGE 1. Turn the ignition off to the lock position. 2. Inspect the Wheel Speed Sensor for proper mounting. 3. Inspect the Wheel Speed Sensor harness and connector. 4. Inspect the Wheel Speed Sensor for excessive debris on the sensor. Were any problems found? Yes  Repair as necessary in accordance with the Service Information.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 3. 3. CHECK (B2) RIGHT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT VOLTAGE NOTE: Check all terminals for broken, bent, pushed out, or corroded terminals. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 29: Measuring Left Front Wheel Speed Sensor Supply Circuit Voltage Courtesy of CHRYSLER GROUP, LLC 1. Disconnect the Right Rear Wheel Speed Sensor harness connector. 2. Turn the ignition on. 3. Measure the voltage between the (B2) Right Rear Wheel Speed Sensor Signal circuit and ground. Is the voltage above 10 volts? Yes  Go To 6. No 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Go To 4. 4. (B2) RIGHT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Fig. 30: Checking Left Front Wheel Speed Sensor Supply Circuit For A Short To Ground Courtesy of CHRYSLER GROUP, LLC 1. Turn the ignition off. 2. Disconnect the ABS Module harness connector. 3. Measure the resistance between the (B2) Right Rear Wheel Speed Sensor Signal circuit and ground. Is the resistance below 5.0 Ohms? Yes  Repair the (B2) Right Rear Wheel Speed Sensor Signal circuit for a short to ground.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 No  Go To 5. 5. (B2) RIGHT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 31: Checking Right Rear Wheel Speed Sensor Signal Circuit For An Open 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Courtesy of CHRYSLER GROUP, LLC 1. Measure the resistance of the (B2) Right Rear Wheel Speed Sensor Signal circuit between the Right Rear Wheel Speed Sensor harness connector and the ABS harness connector. Is the resistance below 5 Ohms? Yes  Go To 6. No  Repair the open (B2) Right Rear Wheel Speed Sensor Signal circuit.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 6. (B1) RIGHT REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 32: Checking Left Front Wheel Speed Sensor Signal Circuit For A Short To Voltage Courtesy of CHRYSLER GROUP, LLC 1. Turn the ignition on. 2. Measure the voltage of the (B1) Right Rear Wheel Speed Sensor Supply circuit at the Right Rear Wheel Speed Sensor harness connector. Is there any voltage present? Yes  Repair the (B1) Right Rear Wheel Speed Sensor Supply circuit for a short to voltage.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 7. 7. (B1) RIGHT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 33: Checking Left Front Wheel Speed Sensor Signal Circuit For A Short To Ground Courtesy of CHRYSLER GROUP, LLC 1. Turn the ignition off. 2. Measure the resistance between the (B1) Right Rear Wheel Speed Sensor Supply circuit and ground. Is the resistance below 5.0 Ohms? Yes  Repair the (B1) Right Rear Wheel Speed Sensor Supply circuit for a short to ground.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 8. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 8. (B1) RIGHT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN Fig. 34: Checking Right Rear Wheel Speed Sensor Signal Circuit For An Open Courtesy of CHRYSLER GROUP, LLC 1. Measure the resistance of the (B1) Right Rear Wheel Speed Sensor Supply circuit between the Right Rear Wheel Speed Sensor harness connector and the ABS harness connector. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Is the resistance below 5 Ohms? Yes  Go To 9. No  Repair the open (B1) Right Rear Wheel Speed Sensor Supply circuit.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 9. (B2) RIGHT REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO THE (B1) RIGHT REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT Fig. 35: Checking Left Front Wheel Speed Sensor Supply Circuit For A Short To The Left Front Wheel Speed Sensor Signal Circuit Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Turn the ignition off to the lock position. 2. Measure the resistance between the (B1) Right Rear Wheel Speed Sensor Supply circuit and the (B2) Right Rear Wheel Speed Sensor Signal circuit at the ABS Module harness connector. Is the resistance below 5.0 Ohms? Yes  Repair (B1) Right Rear Wheel Speed Sensor Supply circuit for a short to the (B2) Right Rear Wheel Speed Sensor Signal circuit.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 10. 10. RIGHT REAR WHEEL SPEED SENSOR 1. Replace the Right Rear Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL . 2. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read ABS DTCs. Is the status Active for this DTC? Yes  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. C003A-29-RIGHT REAR SPEED SENSOR - INVALID SIGNAL CAUTION: Make sure brake capability is available before road testing. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be meet. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 36: Wheel Speed Sensor Wiring Diagram Courtesy of CHRYSLER GROUP, LLC For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage or over voltage condition present. SET CONDITION: 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 When the Antilock Brake System (ABS) Module detects multiple drastic changes in Right Rear wheel speed. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, record and erase DTCs. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read DTCs. Is the DTC active at this time? Yes  Go To 3. No  Go To 2. 2. CHECK WHEEL SPEED SENSOR SIGNALS 1. Turn the ignition on. 2. With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant drives the vehicle. Possible Causes CHECK RIGHT REAR WHEEL SPEED SENSOR FOR LOOSENESS INSPECT CIRCUITS/CONNECTOR/TERMINALS FOR DAMAGE RIGHT REAR WHEEL BEARING AND HUB OR ENCODER FOR DAMAGE RIGHT REAR WHEEL SPEED SENSOR ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: If DTC C003A-01 is present, perform the diagnostics for this DTC before continuing with this diagnostic procedure. CAUTION: Make sure brake capability is available before road testing. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 3. Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph). Is the Right Rear WSS speed showing 0 km/h (0 mph), not matching other wheels, or showing erratic behavior? Yes  Go To 3. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 3. CHECK RIGHT REAR WSS FOR LOOSENESS, INSPECT CIRCUITS/CONNECTORS/TERMINALS FOR DAMAGE 1. Turn the ignition off to the lock position. 2. Inspect the ABS Module harness connector and the Right Rear WSS harness connector. 3. Check the Right Rear WSS for looseness, excessive corrosion and not properly fastened. 4. Inspect the (B1) Right Rear WSS Signal and (B2) Right Rear WSS Supply circuits between the Right Rear WSS and Anti-Lock Brake Module for damage. Is the Right Rear WSS loose or any of the wiring/connectors/terminals damaged? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 4. 4. CHECK RIGHT REAR WHEEL SPEED SENSOR FOR DAMAGE 1. Remove the Right Rear Wheel Speed Sensor. 2. Inspect the Wheel Speed Sensor for proper mounting. 3. Inspect the Wheel Speed Sensor harness and connector. 4. Inspect the Wheel Speed Sensor for excessive debris on the sensor. Is the Right Rear Wheel Speed Sensor damaged? NOTE: If graph shows periodic dropouts pay close attention to the tone wheel. NOTE: Check all terminals for broken, bent, pushed out, or corroded terminals. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Yes  Replace the Right Rear Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 5. 5. CHECK RIGHT REAR WHEEL BEARING AND HUB OR ENCODER FOR DAMAGE 1. Inspect the Right Rear wheel bearing, hub and Encoder for excessive runout, clearance or damage. Is the Right Rear Wheel Bearing, Hub or Encoder Damaged? Yes  Replace the Hub and Wheel Bearing in accordance with the Service Information. Refer to HUB AND BEARING, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 6. 6. RIGHT REAR WHEEL SPEED SENSOR 1. Replace the Right Rear Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL . 2. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read ABS DTCs. Does the DTC remain active? Yes  Replace the Anti-Lock Brakes Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. NOTE: Refer to the appropriate service information, if necessary, for procedures or specifications. NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 No  Test Complete. C003B-29-WHEEL SPEED COMPARATIVE - INVALID SIGNAL Fig. 37: Wheel Speed Sensor Wiring Diagram Courtesy of CHRYSLER GROUP, LLC For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 WHEN MONITORED: With the ignition on and vehicle speed above 15 km/h (9 mph) driving straight with no braking. SET CONDITION: This DTC will set when one or more wheel speed sensor speeds constantly shows a speed that is 25% lower then any of the other wheel speed sensor speeds. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, record and erase DTCs. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read DTCs. Is the DTC active? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT Possible Causes IMPROPER LEFT FRONT TIRE PRESSURE/MISMATCHED TIRES WHEEL SPEED SENSOR (WSS) HUB AND WHEEL BEARING DAMAGED OR INSTALLED INCORRECTLY ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: Repair all other wheel speed sensor DTCs first before continuing with this diagnostic procedure. NOTE: Inspect the tires for improper air pressure and or mismatched tires before continuing, repair as necessary. CAUTION: Make sure brake capability is available before road testing. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 CONDITION. 2. CHECK WHEEL SPEED SENSOR SIGNALS 1. Turn the ignition on. 2. With the scan tool, monitor and graph ALL the Wheel Speed Sensors speeds and compare. 3. Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph). Is one or more of the WSS speeds showing 0 km/h (0 mph) or not matching the other WSS speeds? Yes  Go To 3. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 3. INSPECT WHEEL SPEED SENSOR FOR DAMAGE 1. Turn the ignition off. 2. Inspect each WSS for looseness and or not properly fastened. Are any WSS loose or any of the wiring/connectors/terminals damaged? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 4. 4. CHECK EACH HUB AND WHEEL BEARING FOR DAMAGE 1. Turn the ignition off. 2. Inspect each Hub and Wheel Bearing for damage, corrosion, cracks, looseness, or improper installation. Are any of the Hub and or Wheel Bearings damaged? Yes  Replace the Hub and Wheel Bearing in accordance with the Service Information. Refer to FRONT - HUB AND BEARING, REMOVAL , or REAR - HUB AND BEARING, NOTE: Check all terminals for broken, bent, pushed out, or corroded terminals. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 5. 5. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE 1. Replace the Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL . 2. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. With the scan tool, monitor and graph ALL the Wheel Speed Sensors speeds and compare. 4. Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph). 5. With the scan tool, read the DTCs. Does this DTC remain active? Yes  Replace the Anti-Lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. C0047-01-BRAKE PRESSURE SENSOR - GENERAL ELECTRICAL FAILURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage condition present. SET CONDITION: The Antilock Brake System (ABS) Module is unable to activate the correct solenoid valve. POSSIBLE CAUSES DIAGNOSTIC TEST Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE HYDRAULIC CONTROL UNIT (HCU) 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read and record DTCs. 3. With the scan tool, read and record Freeze Fame information. 4. With the scan tool, erase DTCs. 5. Start the engine. 6. Press the brake pedal firmly and release. 7. With the scan tool, read and record DTCs. Is the DTC active at this time? Yes  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Replace the Hydraulic Control Unit (HCU) in accordance with the Service Information. Refer to HYDRAULIC CONTROL UNIT (HCU), REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. C0047-62-BRAKE PRESSURE SENSOR - SIGNAL COMPARE FAILURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage condition present. SET CONDITION: The Antilock Brake System (ABS) Module is unable to activate the correct solenoid valve. POSSIBLE CAUSES NOTE: This DTC must be active for the results of this test to be valid. NOTE: For this failure it is necessary to replace both the ABS Module and the HCU as a complete unit. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read and record DTCs. 3. With the scan tool, read and record Freeze Fame information. 4. With the scan tool, erase DTCs. 5. Start the engine. 6. Press the brake pedal firmly and release. 7. With the scan tool, read and record DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. CHECK BRAKE PRESSURE SENSOR 1. Start the engine. 2. With the scan tool look at Brake Pressure Sensor Signal and the Brake Switch Signal. 3. With the brakes not applied the Pressure Sensor should read ±15 bar (218 psi). 4. Apply the brakes the Pressure Sensor should read above 15 bar (218 psi). Did Brake Pressure Sensor increase above 15 bar (218 psi)? Yes Possible Causes AIR IN BRAKE SYSTEM BRAKE SWITCH SIGNAL OPEN ANTI-LOCK BRAKE SYSTEM (ABS) MODULE HYDRAULIC CONTROL UNIT (HCU) NOTE: This DTC must be active for the results of this test to be valid. NOTE: For this failure it is necessary to replace both the ABS Module and the HCU as a complete unit. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Replace the Hydraulic Control Unit (HCU) in accordance with the Service Information. Refer to HYDRAULIC CONTROL UNIT (HCU), REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 3. 3. CHECK FOR AIR IN BRAKE SYSTEM 1. Turn ignition off. 2. Bleed brake system. Was there any air in the brake system? Yes  Repair as needed.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Replace the Hydraulic Control Unit (HCU) in accordance with the Service Information. Refer to HYDRAULIC CONTROL UNIT (HCU), REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C0051-29-STEERING ANGLE SENSOR (ESP) - INVALID SIGNAL For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article WHEN MONITORED: With the ignition on. SET CONDITION: NOTE: Before continuing the brake system must be bled to verify there is no air in the brake system. NOTE: For this failure it is necessary to replace both the ABS Module and the HCU as a complete unit. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 When the Anti-Lock Brake (ABS) Module detects too rapid of a change in the Steering Angle Sensor (SAS). POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Perform any Technical Service Bulletins (TSBs) that may apply 2. Ignition on, engine not running. 3. With the scan tool, read and record DTCs. 4. Using the scan tool, read and record Environmental Data. 5. With the scan tool, erase DTCs. 6. With scan tool, graph the steering angle while slowly rotating steering wheel from lock to lock. 7. With the scan tool, read DTCs. Is the graph displaying erratic signal behavior or is the DTC active at this time? Yes  Replace the Steering Angle Sensor (SAS) in accordance with service information. Refer to CLOCKSPRING, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No Go To 2. 2. CHECK THE TERMINALS/CONNECTORS/WIRING HARNESS FOR DAMAGE Possible Causes STEERING ANGLE SENSOR (SAS) LOOSE OR WIRING HARNESS DAMAGE CLOCKSPRING ASSEMBLY ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: This DTC must be active for the results of this test to be valid. WARNING: To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Inspect the Steering Angle Sensor (SAS). 2. Check all related wiring for bruised, chafed, pierced, or partially broken wires. 3. Check all related connectors for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with service information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C0051-54-STEERING ANGLE SENSOR (EPS) - MISSING CONFIGURED For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Ignition on. SET CONDITION: When the ABS Module detects that a new Steering Angle Sensor has been placed on the vehicle, but it has not been calibrated. POSSIBLE CAUSES DIAGNOSTIC TEST SRS. Failure to take the proper precautions could result in accidental airbag deployment. NOTE: Proper Steering Angle Sensor (SAS) installation is crucial for proper operation. Possible Causes STEERING ANGLE SENSOR (SAS) LOOSE OR WIRING HARNESS DAMAGE CLOCKSPRING ASSEMBLY ANTI-LOCK BRAKE SYSTEM (ABS) MODULE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. PERFORM THE LONGITUDINAL G-SENSOR ROUTINE 1. Turn the ignition on. 2. With the scan tool, read and record the ABS DTCs. 3. With the scan tool, perform the "Longitudinal G-Sensor" routine and perform and the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. Was the routine successful? Yes  Go To 2. No  Perform the "Longitudinal G-Sensor" routine again, if still unsuccessful.  Go To 3. 2. VERIFY IF THE DTC IS STILL ACTIVE 1. Turn the ignition on. 2. With the scan tool, erase the DTCs. 3. Test drive the vehicle by turning the vehicle left and right in a curving manner at a velocity between 15 and 35 km/h (9 and 22 mph). 4. Park the vehicle. 5. With the scan tool, read ABS DTCs. Is this DTC still active? Yes  Go To 3. No  Test complete. 3. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE 1. Turn the ignition off to the lock position. WARNING: To avoid possible serious or fatal injury, check brake capability is available before road testing. WARNING: To avoid possible serious or fatal injury, check brake capability is available before road testing. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 2. Replace the Steering Angle Sensor (SAS) in accordance with the Service Information. Refer to CLOCKSPRING, REMOVAL . 3. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 4. Test drive the vehicle by turning the vehicle left and right in a curving manner at a velocity between 15 and 35 km/h (9 and 22 mph). 5. With the scan tool, read the DTCs. Does the DTC remain active? Yes  Replace the Anti-Lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. C0051-86-STEERING ANGLE SENSOR (EPS) - BUS SIGNAL INVALID For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on. SET CONDITION: When the Anti-Lock Brake (ABS) Module detects too rapid of a change in the Steering Angle Sensor (SAS). POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Perform any Technical Service Bulletins (TSBs) that may apply. Possible Causes STEERING ANGLE SENSOR (SAS) LOOSE OR WIRING HARNESS DAMAGE CLOCKSPRING ASSEMBLY ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 2. Ignition on, engine not running. 3. With the scan tool, read and record DTCs. 4. Using the scan tool, read and record Environmental Data. 5. With the scan tool, erase DTCs. 6. With scan tool, graph the steering angle while slowly rotating steering wheel from lock to lock. 7. With the scan tool, read DTCs. Is the graph displaying erratic signal behavior or is the DTC active at this time? Yes  Replace the Steering Angle Sensor (SAS) in accordance with service information. Refer to CLOCKSPRING, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No Go To 2. 2. CHECK THE TERMINALS/CONNECTORS/WIRING HARNESS FOR DAMAGE 1. Inspect the Steering Angle Sensor (SAS). 2. Check all related wiring for bruised, chafed, pierced, or partially broken wires. 3. Check all related connectors for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. WARNING: To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the SRS. Failure to take the proper precautions could result in accidental airbag deployment. NOTE: Proper Steering Angle Sensor (SAS) installation is crucial for proper operation. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 No  Replace the Antilock Brake System (ABS) Module in accordance with service information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C0061-29-LATERAL ACCELERATION SENSOR - INVALID SIGNAL For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on. SET CONDITION: When the Anti-Lock Brake (ABS) Module detects a invalid signal from the Dynamics Sensor. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Ignition on, engine not running. 3. With the scan tool, record and erase the DTCs. 4. Using the scan tool, read and record Environmental Data. 5. With the scan tool, read the DTCs. Is the DTC active at this time? Yes  Go To 2. No Possible Causes DYNAMICS SENSOR IMPROPERLY INSTALLED/LOOSE OR WIRING HARNESS DAMAGE DYNAMICS SENSOR ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. DYNAMICS SENSOR IMPROPERLY INSTALLED/LOOSE OR WIRING HARNESS DAMAGE 1. Inspect the Dynamics Sensor and mounting. 2. Check all related wiring for bruised, chafed, pierced, or partially broken wires. 3. Check all related connectors for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 3. 3. DYNAMICS SENSOR 1. Replace the Dynamics Sensor in accordance with service information. Refer to SENSOR, DYNAMICS, REMOVAL . Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 2. With the scan tool, read the DTCs. Does the DTC remain active? Yes  Replace the Antilock Brake System (ABS) Module in accordance with service information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. C0061-86-LATERAL ACCELERATION SENSOR - BUS SIGNAL INVALID For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 With the ignition on. SET CONDITION: When the Anti-Lock Brake (ABS) Module detects an invalid signal from the Dynamics Sensor. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Ignition on, engine not running. 3. With the scan tool, record and erase the DTCs. 4. Using the scan tool, read and record Environmental Data. 5. With the scan tool, read the DTCs. Is the DTC active at this time? Yes  Go To 2. No  The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. DYNAMICS SENSOR IMPROPERLY INSTALLED/LOOSE OR WIRING HARNESS DAMAGE 1. Inspect the Dynamics Sensor and mounting. 2. Check all related wiring for bruised, chafed, pierced, or partially broken wires. 3. Check all related connectors for broken, bent, pushed out, or corroded terminals. Were any problems found? Possible Causes DYNAMICS SENSOR IMPROPERLY INSTALLED/LOOSE OR WIRING HARNESS DAMAGE DYNAMICS SENSOR ASSEMBLY ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 3. 3. DYNAMICS SENSOR 1. Replace the Dynamics Sensor in accordance with service information. Refer to SENSOR, DYNAMICS, REMOVAL . Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 2. With the scan tool, read the DTCs. Does the DTC remain active? Yes  Replace the Antilock Brake System (ABS) Module in accordance with service information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. C0062-29-LONGITUDINAL ACCELERATION SENSOR - INVALID SIGNAL For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on. SET CONDITION: When the Anti-Lock Brake (ABS) Module detects an invalid signal from the Dynamics Sensor. POSSIBLE CAUSES Possible Causes DYNAMICS SENSOR IMPROPERLY INSTALLED/LOOSE OR WIRING HARNESS DAMAGE DYNAMICS SENSOR ANTI-LOCK BRAKE SYSTEM (ABS) MODULE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Ignition on, engine not running. 3. With the scan tool, record and erase the DTCs. 4. Using the scan tool, read and record Environmental Data. 5. With the scan tool, read the DTCs. Is the DTC active at this time? Yes  Go To 2. No  The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. DYNAMICS SENSOR IMPROPERLY INSTALLED/LOOSE OR WIRING HARNESS DAMAGE 1. Inspect the Dynamics Sensor and mounting. 2. Check all related wiring for bruised, chafed, pierced, or partially broken wires. 3. Check all related connectors for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 3. 3. DYNAMICS SENSOR 1. Replace the Dynamics Sensor in accordance with service information. Refer to SENSOR, DYNAMICS, REMOVAL . NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 2. With the scan tool, read the DTCs. Does the DTC remain active? Yes  Replace the Antilock Brake System (ABS) Module in accordance with service information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. C0062-54-LONGITUDINAL ACCELERATION SENSOR - MISSING CALIBRATION For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Ignition on. SET CONDITION: When the ABS Module detects that a new Dynamics Sensor has been placed on the vehicle, but it has not been calibrated. POSSIBLE CAUSES DIAGNOSTIC TEST 1. PERFORM THE LONGITUDINAL G-SENSOR ROUTINE 1. Turn the ignition on. 2. With the scan tool, read and record the ABS DTCs. Possible Causes DYNAMICS SENSOR IMPROPERLY INSTALLED/LOOSE OR WIRING HARNESS DAMAGE DYNAMICS SENSOR ASSEMBLY ANTI-LOCK BRAKE SYSTEM (ABS) MODULE WARNING: To avoid possible serious or fatal injury, check brake capability is available before road testing. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 3. With the scan tool, perform the "Longitudinal G-Sensor" routine and perform and the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. Was the routine successful? Yes  Go To 2. No  Perform the "Longitudinal G-Sensor" routine again, if still unsuccessful.  Go To 3. 2. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, erase the DTCs. 3. Test drive the vehicle by turning the vehicle left and right in a curving manner at a velocity between 15 and 35 km/h (9 and 22 mph). 4. Park the vehicle. 5. With the scan tool, read ABS DTCs. Does the DTC remain active? Yes  Go To 3. No  Test complete. 3. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE 1. Turn the ignition off to the lock position. 2. Replace the Dynamics Sensor in accordance with service information. Refer to SENSOR, DYNAMICS, REMOVAL . 3. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 4. Test drive the vehicle by turning the vehicle left and right in a curving manner at a velocity between 15 and 35 km/h (9 and 22 mph). 5. With the scan tool, read the DTCs. WARNING: To avoid possible serious or fatal injury, check brake capability is available before road testing. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Does the DTC remain active? Yes  Replace the Anti-Lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. C0062-86-LONGITUDINAL ACCELERATION SENSOR - BUS SIGNAL INVALID For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on. SET CONDITION: When the Anti-Lock Brake (ABS) Module detects an invalid signal from the Dynamics Sensor. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Ignition on, engine not running. 3. With the scan tool, record and erase the DTCs. 4. Using the scan tool, read and record Environmental Data. 5. With the scan tool, read the DTCs. Is the DTC active at this time? Possible Causes DYNAMICS SENSOR IMPROPERLY INSTALLED/LOOSE OR WIRING HARNESS DAMAGE DYNAMICS SENSOR ASSEMBLY ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Yes  Go To 2. No  The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. DYNAMICS SENSOR IMPROPERLY INSTALLED/LOOSE OR WIRING HARNESS DAMAGE 1. Inspect the Dynamics Sensor and mounting. 2. Check all related wiring for bruised, chafed, pierced, or partially broken wires. 3. Check all related connectors for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 3. 3. DYNAMICS SENSOR 1. Replace the Dynamics Sensor in accordance with service information. Refer to SENSOR, DYNAMICS, REMOVAL . Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 2. With the scan tool, read the DTCs. Does the DTC remain active? Yes  Replace the Antilock Brake System (ABS) Module in accordance with service information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 C0063-29-YAW RATE SENSOR - INVALID SIGNAL For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on. SET CONDITION: When the Anti-Lock Brake (ABS) Module detects an invalid signal from the Dynamics Sensor. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Ignition on, engine not running. 3. With the scan tool, record and erase the DTCs. 4. Using the scan tool, read and record Environmental Data. 5. With the scan tool, read the DTCs. Is the DTC active at this time? Yes  Go To 2. No  The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. DYNAMICS SENSOR IMPROPERLY INSTALLED/LOOSE OR WIRING HARNESS DAMAGE Possible Causes DYNAMICS SENSOR IMPROPERLY INSTALLED/LOOSE OR WIRING HARNESS DAMAGE DYNAMICS SENSOR ASSEMBLY ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Inspect the Dynamics Sensor and mounting. 2. Check all related wiring for bruised, chafed, pierced, or partially broken wires. 3. Check all related connectors for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 3. 3. DYNAMICS SENSOR 1. Replace the Dynamics Sensor in accordance with service information. Refer to SENSOR, DYNAMICS, REMOVAL . Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 2. With the scan tool, read the DTCs. Does the DTC remain active? Yes  Replace the Antilock Brake System (ABS) Module in accordance with service information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. C0063-62-YAW RATE SENSOR - SIGNAL COMPARE FIGURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on. SET CONDITION: When the Anti-Lock Brake (ABS) Module detects a invalid signal from the Dynamics Sensor. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Ignition on, engine not running. 3. With the scan tool, record and erase the DTCs. 4. Using the scan tool, read and record Environmental Data. 5. With the scan tool, read the DTCs. Is the DTC active at this time? Yes  Go To 2. No  The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. DYNAMICS SENSOR IMPROPERLY INSTALLED/LOOSE OR WIRING HARNESS DAMAGE 1. Inspect the Dynamics Sensor and mounting. 2. Check all related wiring for bruised, chafed, pierced, or partially broken wires. 3. Check all related connectors for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. Possible Causes DYNAMICS SENSOR IMPROPERLY INSTALLED/LOOSE OR WIRING HARNESS DAMAGE DYNAMICS SENSOR ASSEMBLY ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 No  Go To 3. 3. DYNAMICS SENSOR 1. Replace the Dynamics Sensor in accordance with service information. Refer to SENSOR, DYNAMICS, REMOVAL . Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 2. With the scan tool, read the DTCs. Does the DTC remain active? Yes  Replace the Antilock Brake System (ABS) Module in accordance with service information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. C0063-86-YAW RATE SENSOR - BUS SIGNAL INVALID For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Continuously with the ignition on, one valid CAN message received at least once. SET CONDITION: When the Anti-Lock Brake system (ABS) Module detects an invalid signal from the Dynamics Sensor. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE Possible Causes DYNAMICS SENSOR ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Ignition on, engine not running. 3. With the scan tool, record and erase the DTCs. 4. Using the scan tool, read and record Environmental Data. 5. With the scan tool, read the DTCs. Is the DTC active at this time? Yes  Go To 2. No  The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. DYNAMICS SENSOR IMPROPERLY INSTALLED/LOOSE OR WIRING HARNESS DAMAGE 1. Inspect the Dynamics Sensor and mounting. 2. Check all related wiring for bruised, chafed, pierced, or partially broken wires. 3. Check all related connectors for broken, bent, pushed out, or corroded terminals. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 3. 3. DYNAMICS SENSOR 1. Replace the Dynamics Sensor in accordance with service information. Refer to SENSOR, DYNAMICS, REMOVAL . Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 2. With the scan tool, read the DTCs. Does the DTC remain active? 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Yes  Replace the Antilock Brake System (ABS) Module in accordance with service information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. C1115-16-VALVE SUPPLY VOLTAGE - BELOW THRESHOLD 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 38: ABS Module Power Supply Wiring Diagram Courtesy of CHRYSLER GROUP, LLC For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 WHEN MONITORED: Ignition on. SET CONDITION: If the sensed ignition voltage drops below 9 volts with engine running or vehicle speed present for 100 msec or if voltage is below 7 volts the maturation time changes to 15 ms. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Ignition on, engine not running. 2. With the scan tool, record and erase DTCs. 3. Turn ignition off to the lock position. 4. Start the engine. 5. With the scan tool, read DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. POWER CIRCUITS FOR AN OPEN OR HIGH RESISTANCE Possible Causes CHARGING SYSTEM POWER CIRCUITS OPEN OR HIGH RESISTANCE GROUND CIRCUITS OPEN OR HIGH RESISTANCE ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: Diagnose and repair any Powertrain Charging system DTCs before continuing with this procedure. NOTE: Make sure the battery is fully charged. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 39: Checking Power Circuits For An Open Or High Resistance Courtesy of CHRYSLER GROUP, LLC 1. Turn ignition off to the lock position. 2. Disconnect the ABS Module harness connector. 3. Ignition on, engine not running. 4. With a 12-volt test light connected to ground, check the (A107) Fused B+, (A111) Fused B+ and (F941) Fused Ignition Switch Output circuits at the ABS harness connector. Does the test light illuminate brightly? Yes  Go To 3. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 No  Repair the Power circuits for an open or high resistance.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. GROUND CIRCUITS OPEN OR HIGH RESISTANCE Fig. 40: Checking Ground Circuits For An Open Or High Resistance Courtesy of CHRYSLER GROUP, LLC 1. Turn ignition off to the lock position. 2. With a test light connected to B+ check (Z907) and (Z908) Ground circuits at the ABS harness connector. Does the test light illuminate brightly? Yes 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Replace the Antilock Brake System (ABS) Module in accordance with the service information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Repair the Ground circuits for an open or high resistance.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1200-16-BATTERY VOLTAGE - BELOW THRESHOLD 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 41: ABS Module Power Supply Wiring Diagram Courtesy of CHRYSLER GROUP, LLC For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 WHEN MONITORED: Ignition on. SET CONDITION: If the sensed ignition voltage drops below 9 volts with engine running or vehicle speed present for 100 msec or if voltage is below 7 volts the maturation time changes to 15 ms. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Ignition on, engine not running. 2. With the scan tool, record and erase DTCs. 3. Turn ignition off to the lock position. 4. Start the engine. 5. With the scan tool, read DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. POWER CIRCUITS FOR AN OPEN OR HIGH RESISTANCE Possible Causes CHARGING SYSTEM POWER CIRCUITS OPEN OR HIGH RESISTANCE GROUND CIRCUITS OPEN OR HIGH RESISTANCE ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: Diagnose and repair any Powertrain Charging system DTCs before continuing with this procedure. NOTE: Make sure the battery is fully charged. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 42: Checking Power Circuits For An Open Or High Resistance Courtesy of CHRYSLER GROUP, LLC 1. Turn ignition off to the lock position. 2. Disconnect the ABS Module harness connector. 3. Ignition on, engine not running. 4. With a 12-volt test light connected to ground, check the Fused B+ and Fused Ignition Switch Output circuits at the ABS Module harness connector. Does the test light illuminate brightly? Yes  Go To 3. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 No  Repair the Power circuits for an open or high resistance.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. GROUND CIRCUITS OPEN OR HIGH RESISTANCE Fig. 43: Checking Ground Circuits For An Open Or High Resistance Courtesy of CHRYSLER GROUP, LLC 1. Turn ignition off to the lock position. 2. With a test light connected to B+ check the Ground circuits at the ABS Module harness connector. Does the test light illuminate brightly? Yes 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Replace the Antilock Brake System (ABS) Module in accordance with the service information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Repair the Ground circuits for an open or high resistance.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1200-17-BATTERY VOLTAGE - ABOVE THRESHOLD For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Ignition on. SET CONDITION: If the sensed ignition voltage is greater than 16.5 volts for 100 msec. POSSIBLE CAUSES DIAGNOSTIC TEST 1. CHARGING SYSTEM DTCS PRESENT 1. Start the engine. 2. With the scan tool, read DTCs in the PCM. Are there any Charging System or related voltage DTCs present? Yes  Perform the appropriate Charging System DTC diagnostic procedures before continuing with this test. Refer to CHARGING SYSTEM - DIAGNOSIS AND TESTING . No  Go To 2. Possible Causes POWERTRAIN CONTROL MODULE (PCM) CHARGING SYSTEM DTCS PRESENT ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: Disconnect battery charger before continuing. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 2. VERIFY THE DTC IS ACTIVE 1. Ignition on, engine not running. 2. With the scan tool, record and erase DTCs. 3. Turn ignition off to the lock position. 4. Start the engine. 5. With the scan tool, read DTCs. Is the DTC active at this time? Yes  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Perform the ABS-INTERMITTENT TEST. Refer to ABS INTERMITTENT CONDITION. C1205-49-VALVE RELAY - INTERNAL ELECTRONIC FAILURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Ignition on. SET CONDITION: The Antilock Brake System (ABS) Module has detected an internal error. POSSIBLE CAUSES DIAGNOSTIC TEST 1. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE INTERNAL CONDITION 1. The ABS Module is reporting internal errors. Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: Before continuing, check the Antilock Brake System (ABS) Module harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 2. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. 3. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1206-01-PRIMING VALVE 1 - GENERAL ELECTRICAL FAILURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Ignition on. SET CONDITION: The Antilock Brake System (ABS) Module has detected an internal error. POSSIBLE CAUSES DIAGNOSTIC TEST 1. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE INTERNAL CONDITION 1. The ABS Module is reporting internal errors. 2. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: Before continuing, check the Antilock Brake System (ABS) Module harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 3. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1207-01-PRIMING VALVE 2 - GENERAL ELECTRICAL FAILURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Ignition on. SET CONDITION: The Antilock Brake System (ABS) Module has detected an internal error. POSSIBLE CAUSES DIAGNOSTIC TEST 1. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE INTERNAL CONDITION 1. The ABS Module is reporting internal errors. 2. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. 3. Perform any Technical Service Bulletins that may apply. Were there any problems found? Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: Before continuing, check the Antilock Brake System (ABS) Module harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1208-01-PILOT VALVE 1 - GENERAL ELECTRICAL FAILURE For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Ignition on. SET CONDITION: The Antilock Brake System (ABS) Module has detected an internal error. POSSIBLE CAUSES DIAGNOSTIC TEST 1. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE INTERNAL CONDITION 1. The ABS Module is reporting internal errors. 2. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. 3. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes  Repair as necessary. Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: Before continuing, check the Antilock Brake System (ABS) Module harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1209-01-PILOT VALVE 2 - GENERAL ELECTRICAL FAILURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Ignition on. SET CONDITION: The Antilock Brake System (ABS) Module has detected an internal error. POSSIBLE CAUSES DIAGNOSTIC TEST 1. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE INTERNAL CONDITION 1. The ABS Module is reporting internal errors. 2. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. 3. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: Before continuing, check the Antilock Brake System (ABS) Module harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C120A-24-ESC SWITCH - SIGNAL STUCK HIGH For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Continuous monitoring. SET CONDITION: If the Anti-Lock Brake System (ABS) Module senses voltage from the Electronic Stability Control (ESC) Switch for longer than 20 seconds. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Ignition on, engine not running. 3. With the scan tool, read and record DTCs. 4. Using the scan tool, read and record Environmental Data. 5. With the scan tool, record and erase DTCs. 6. With the scan tool, read DTCs. Is the DTC active at this time? Yes  Go To 2. No Possible Causes ESC ON/OFF SENSE CIRCUIT FOR A SHORT TO VOLTAGE ELECTRONIC STABILITY CONTROL (ESC) SWITCH ANTI-LOCK BRAKES SYSTEM (ABS) MODULE NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. ELECTRONIC STABILITY CONTROL (ESC) SWITCH 1. Turn the ignition off. 2. Disconnect the ESC Switch harness connector. 3. Turn the ignition on. 4. With the scan tool, read DTCs. Does the DTC remain active? Yes  Go To 3. No  Replace the Electronic Stability Control (ESC) Switch in accordance with the Service Information. Refer to SWITCH, ELECTRONIC STABILITY PROGRAM (ESP), DESCRIPTION .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. ESC ON/OFF SENSE CIRCUIT FOR A SHORT TO VOLTAGE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 44: Checking ESC On/Off Sense Circuit For A Short To Voltage Courtesy of CHRYSLER GROUP, LLC 1. Turn the ignition off. 2. Disconnect the ABS Module harness connector. 3. Turn the ignition on. 4. Measure the voltage of the ESC ON/OFF Sense circuit at the ABS MODULE harness connector. Is there any voltage present? Yes  Repair the ESC ON/OFF Sense circuit for a short to voltage.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Replace the Antilock Bake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1210-86-ABS/ESC LAMP COMMUNICATION - INVALID SIGNAL For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Ignition on. SET CONDITION: The Antilock Brake System (ABS) Module is receiving invalid messages from the Body Control Module (BCM) this DTC is set. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Turn the ignition on. 3. With the scan tool, read and record the DTCs. 4. With the scan tool, read and record the Environmental Data to help identify the conditions in which the DTC was set. 5. With the scan tool, erase the DTCs. 6. Start the engine. 7. With the scan tool, read the DTCs. Is the DTC active at this time? Yes  Go To 2. No Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE BODY CONTROL MODULE (BCM) NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE 1. Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL . Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 2. Turn the ignition on. 3. With the scan tool, record and erase DTCs. 4. Cycle the ignition switch from off to on. 5. With the scan tool, read DTCs. Does the DTC remain active? Yes  Replace the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. C1211-49-ABS INTERNAL ELECTRONIC FAILURE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Ignition on. SET CONDITION: The Antilock Brake System (ABS) Module has detected an internal error. POSSIBLE CAUSES DIAGNOSTIC TEST 1. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE INTERNAL CONDITION Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. The ABS Module is reporting internal errors. 2. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. 3. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Antilock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1212-55-VARIANT CODING - NOT CONFIGURED For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Ignition on. SET CONDITION: If the Anti-Lock Brake Module detects an invalid variant code. POSSIBLE CAUSES DIAGNOSTIC TEST 1. PERFORM THE LONGITUDINAL G-SENSOR ROUTINE 1. Turn the ignition on. 2. With the scan tool, record and erase the DTCs NOTE: Before continuing, check the Antilock Brake System (ABS) Module harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 3. With the scan tool, perform the "Longitudinal G-Sensor" routine and perform and the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. Was the routine successful? Yes  Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. No  Perform the "Longitudinal G-Sensor" routine again, if still unsuccessful.  Replace the Anti-Lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1213-54-EOL MISSING CALIBRATION For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Ignition on. SET CONDITION: If the Anti-Lock Brake Module detects an invalid variant code. POSSIBLE CAUSES DIAGNOSTIC TEST 1. PERFORM THE LONGITUDINAL G-SENSOR ROUTINE 1. Turn the ignition on. 2. With the scan tool, record and erase the DTCs WARNING: To avoid possible serious or fatal injury, check brake capability is available before road testing. Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE WARNING: To avoid possible serious or fatal injury, check brake capability 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 3. With the scan tool, perform the "Longitudinal G-Sensor" routine and perform and the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. Was the routine successful? Yes  Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. No  Perform the "Longitudinal G-Sensor" routine again, if still unsuccessful.  Replace the Anti-Lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1213-55-EOL NOT CONFIGURED For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Ignition on. SET CONDITION: If the Anti-Lock Brake Module detects an invalid variant code. POSSIBLE CAUSES DIAGNOSTIC TEST 1. PERFORM THE LONGITUDINAL G-SENSOR ROUTINE 1. Turn the ignition on. 2. With the scan tool, record and erase the DTCs is available before road testing. Possible Causes ANTI-LOCK BRAKE SYSTEM (ABS) MODULE WARNING: To avoid possible serious or fatal injury, check brake capability is available before road testing. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 3. With the scan tool, perform the "Longitudinal G-Sensor" routine and perform and the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. Was the routine successful? Yes  Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. No  Perform the "Longitudinal G-Sensor" routine again, if still unsuccessful.  Replace the Anti-Lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1214-01-YAW/LATERAL/LONGITUDINAL SENSOR CLUSTER - GENERAL ELECTRICAL FAILURE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 45: Dynamic Sensor Wiring Diagram Courtesy of CHRYSLER GROUP, LLC For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and no system under voltage or over voltage condition present. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 SET CONDITION: When the Dynamics Sensor has detected an over or under voltage. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read and record DTCs. 3. With the scan tool, read and record Freeze Fame information. 4. With the scan tool, erase DTCs. 5. Start the engine. 6. Press the brake pedal firmly and release. 7. With the scan tool, read and record DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. POWER CIRCUIT FOR AN OPEN OR SHORTED Possible Causes POWER CIRCUIT FOR AN OPEN OR SHORTED GROUND CIRCUIT FOR AN OPEN DYNAMICS SENSOR NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 46: Checking Power Circuit For An Open Or A Short Courtesy of CHRYSLER GROUP, LLC 1. Turn the ignition off. 2. Disconnect the Dynamics Sensor harness connector. 3. Using a 12-volt test light connected to ground, check the Fused B(+) circuit. Does the test light illuminate brightly? Yes  Go To 3. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 No  Repair the Fused B(+) circuit for an open or short.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. GROUND CIRCUIT FOR AN OPEN Fig. 47: Checking Ground Circuit For An Open Courtesy of CHRYSLER GROUP, LLC 1. Using a 12-volt test light connected to 12-volts, check the (Z910) Ground circuit. Does the test light illuminate brightly? Yes 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Replace the Dynamics Sensor in accordance with the Service Information. Refer to SENSOR, DYNAMICS, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Repair the Ground circuit for an open.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1215-24-BRAKE SWITCH - STUCK HIGH For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Continuously monitored. SET CONDITION: If the Anti-Lock Brakes System (ABS) Module detects that the Stop Lamp Switch is stuck high. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read and record the ABS DTCs. 3. With the scan tool, read and record Environmental Data (EV Data). 4. With the scan tool, erase the ABS DTCs. 5. Cycle the ignition switch. 6. Test drive the vehicle by turning the vehicle left or right in a curving manner at a velocity between Possible Causes STOP LAMP SWITCH INSTALLATION STOP LAMP SWITCH ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: Diagnose and repair any Powertrain Control Module (PCM), VIN or Communication DTCs before continuing with this diagnostic procedure. WARNING: Make sure brake capability is available before road testing. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 10 and 20 km/h (6 and 12 mph). 7. Park the vehicle. 8. With the scan tool, read the ABS DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. CHECK THE STOP LAMP SWITCH INSTALLATION 1. Turn the ignition off. 2. Inspect the Stop lamp Switch to make sure it is properly installed. 3. Check all related connectors for broken, bent, pushed out, or corroded terminals. 4. Check the Stop lamp Switch to make sure it is returning to the proper position. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 3. 3. STOP LAMP SWITCH OPERATION 1. Turn the ignition on. 2. With the scan tool, observe the PRIMARY BRAKE SWITCH status. 3. Press the brake pedal. 4. Release the brake pedal. Is the brake pedal switch status operating correctly? Yes  Replace the Stop Lamp Switch in accordance with the Service Information. Refer to SWITCH, STOP LAMP, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 No  Replace the Anti-Lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1215-29-BRAKE LIGHT SWITCH - INVALID SIGNAL For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With ignition on, but not if supply voltage faults are detected. SET CONDITION: If the Anti-Lock Brake System (ABS) Module detects that the Brake Lamp Switch is sending an internal failure message. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read and record the ABS DTCs. 3. With the scan tool, read and record Environmental Data (EV Data). 4. With the scan tool, erase the ABS DTCs. 5. Cycle the ignition switch. 6. Test drive the vehicle by turning the vehicle left or right in a curving manner at a velocity between 10 and 20 km/h (6 and 12 mph). 7. With the scan tool, read the ABS DTCs. Possible Causes STOP LAMP SWITCH INSTALLATION STOP LAMP SWITCH ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: Diagnose and repair any Powertrain Control Module (PCM), VIN or Communication DTCs before continuing with this diagnostic procedure. WARNING: Make sure brake capability is available before road testing. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. CHECK THE STOP LAMP SWITCH INSTALLATION 1. Turn the ignition off. 2. Inspect the Stop lamp Switch to make sure it is properly installed. 3. Check all related connectors for broken, bent, pushed out, or corroded terminals. 4. Check the Stop lamp Switch to make sure it is returning to the proper position. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Go To 3. 3. STOP LAMP SWITCH 1. Replace the Stop Lamp Switch in accordance with the Service Information. Refer to SWITCH, STOP LAMP, REMOVAL . 2. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. With the scan tool, read the ABS DTCs. Does the DTC remain active? Yes  Replace the Anti-Lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 C1217-72-REVERSE GEAR SWITCH - ACTUATOR STUCK OPEN For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article WHEN MONITORED: With the ignition on. SET CONDITION: When the Anti-Lock Brake System (ABS) Module detects the signal from the reverse gear switch actuator is stuck open. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read and record the DTCs. 3. With the scan tool, read and record the Environmental Data to help identify the conditions in which the DTC was set. 4. With the scan tool, erase the DTCs. 5. Start the engine. 6. Shift the transmission into Reverse. 7. With the scan tool, read and the DTCs. Is the DTC active at this time? Yes  Go To 2. No Possible Causes REVERSE GEAR SWITCH ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: If any other DTCs are present, repair them first before continuing with this diagnostic procedure. NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. REVERSE GEAR SWITCH OPERATION 1. Turn the ignition on. 2. With the scan tool, actuate the reverse gear switch. Does the reverse gear switch actuate correctly? Yes  Replace the Anti-Lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Reverse Gear Switch in accordance with the Service Information. For Automatic Transmissions, Refer to SHIFTER, TRANSMISSION, REMOVAL . For Manual Transmissions refer to C510 M/T - SWITCH, BACKUP LAMP, REMOVAL or C514 M/T - SWITCH, BACKUP LAMP, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1217-73-REVERSE GEAR SWITCH - ACTUATOR STUCK CLOSED For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on. SET CONDITION: When the Anti-Lock Brake System (ABS) Module detects the signal from the reverse gear switch actuator is stuck closed. POSSIBLE CAUSES DIAGNOSTIC TEST Possible Causes REVERSE GEAR SWITCH ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: If any other DTCs are present, repair them first before continuing with this diagnostic procedure. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read and record the DTCs. 3. With the scan tool, read and record the Environmental Data to help identify the conditions in which the DTC was set. 4. With the scan tool, erase the DTCs. 5. Start the engine. 6. Shift the transmission into Reverse. 7. With the scan tool, read and the DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. REVERSE GEAR SWITCH OPERATION 1. Turn the ignition on. 2. With the scan tool, actuate the reverse gear switch. Does the reverse gear switch actuate correctly? Yes  Replace the Anti-Lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Reverse Gear Switch in accordance with the Service Information. For Automatic Transmissions, Refer to SHIFTER, TRANSMISSION, REMOVAL . For Manual Transmissions refer to C510 M/T - SWITCH, BACKUP LAMP, REMOVAL or C514 M/T - SWITCH, BACKUP LAMP, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1218-4B-VALVES ACTUATED TOO LONG BY TESTER - OVER TEMPERATURE NOTE: This DTC must be active for the results of this test to be valid. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on. SET CONDITION: When the Antilock Brake System (ABS) Module calculated thermal model has determined that there has been excessive system activation. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Ignition on, engine not running. 3. With the scan tool, read and record DTCs. 4. Using the scan tool, read and record Environmental Data. 5. With the scan tool, record and erase DTCs. 6. With the scan tool, read DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. ANTI-LOCK BRAKE SYSTEM (ABS) Possible Causes ABS, TCS, ESP CONTROL TOO LONG OR TO FREQUENT ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: This DTC must be active for the results of this test to be valid. NOTE: Check with customer on driving terrain (e.g. mud, snow, ice) for set condition. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Visually inspect the ABS Module wiring. 2. Visually inspect the braking system. Were any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace the Hydraulic Control Unit (HCU) in accordance with the Service Information. Refer to HYDRAULIC CONTROL UNIT (HCU), REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1219-16-PUMP SUPPLY VOLTAGE - BELOW THRESHOLD 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 48: ABS Module Power Supply Wiring Diagram Courtesy of CHRYSLER GROUP, LLC For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 WHEN MONITORED: Ignition on. SET CONDITION: If the sensed ignition voltage drops below 9 volts with engine running or vehicle speed present for 100 msec or if voltage is below 7 volts the maturation time changes to 15 ms. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Ignition on, engine not running. 2. With the scan tool, record and erase DTCs. 3. Turn ignition off to the lock position. 4. Start the engine. 5. With the scan tool, read DTCs. Is the DTC active at this time? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. POWER CIRCUITS FOR AN OPEN OR HIGH RESISTANCE Possible Causes CHARGING SYSTEM POWER CIRCUITS OPEN OR HIGH RESISTANCE GROUND CIRCUITS OPEN OR HIGH RESISTANCE ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: Diagnose and repair any Powertrain Charging system DTCs before continuing with this procedure. NOTE: Make sure the battery is fully charged. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 49: Checking Power Circuits For An Open Or High Resistance Courtesy of CHRYSLER GROUP, LLC 1. Turn ignition off to the lock position. 2. Disconnect the ABS Module harness connector. 3. Ignition on, engine not running. 4. With a 12-volt test light connected to ground, check the (A107) Fused B+, (A111) Fused B+ and (F941) Fused Ignition Switch Output circuits at the ABS harness connector. Does the test light illuminate brightly? Yes  Go To 3. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 No  Repair the Power circuits for an open or high resistance.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. 3. GROUND CIRCUITS OPEN OR HIGH RESISTANCE Fig. 50: Checking Ground Circuits For An Open Or High Resistance Courtesy of CHRYSLER GROUP, LLC 1. Turn ignition off to the lock position. 2. With a test light connected to B+ check (Z907) and (Z908) Ground circuits at the ABS harness connector. Does the test light illuminate brightly? Yes 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Replace the Antilock Brake System (ABS) Module in accordance with the service information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Repair the Ground circuits for an open or high resistance.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1220-95-WHEEL SPEED SENSORS SWAPPED 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Fig. 51: Wheel Speed Sensor Wiring Diagram Courtesy of CHRYSLER GROUP, LLC For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: With the ignition on and vehicle speed above 15 km/h (9 mph) driving straight with no braking. SET CONDITION: 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 This DTC will set when the Antilock Brake System (ABS) Module detects that the rear wheel speed sensors are transposed. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, record and erase DTCs. 3. Road test the vehicle over 40 km/h (25 mph). 4. With the scan tool, read DTCs. Is the DTC active? Yes  Go To 2. No  Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION. 2. INSPECT THE REAR WHEEL SPEED SENSOR WIRING 1. Turn the ignition off. 2. Check that the rear wheel speed sensor wiring harnesses are correctly routed to the proper rear wheel speed sensor. Are the Wheel Speed Sensor's wired correctly? Possible Causes WHEEL SPEED SENSOR (WSS) ANTI-LOCK BRAKE SYSTEM (ABS) MODULE NOTE: Repair all other wheel speed sensor DTCs first before continuing with this diagnostic procedure. NOTE: Inspect the tires for improper air pressure and or mismatched tires before continuing, repair as necessary. CAUTION: Make sure brake capability is available before road testing. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Yes  Replace the Anti-Lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. C1221-86-PCM BUS SIGNAL INVALID For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Continuously when the ignition is on. The battery voltage between 10 and 16 Volts. Body Control Module (BCM) is configured correctly. SET CONDITION: Bus messages not received from the Powertrain Control Module (PCM) for approximately two to five seconds. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read the DTCs. Possible Causes CAN BUS CIRCUITS OPEN OR SHORTED DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES POWERTRAIN CONTROL MODULE POWER AND GROUND BCM NOT CONFIGURED CORRECTLY POWERTRAIN CONTROL MODULE (PCM) MODULE THAT SET THIS DTC NOTE: Make sure the battery is fully charged before proceeding. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Is the DTC active at this time? Yes  Refer to U1701-87-LOST COMMUNICATION WITH PCM and perform the U1701-87- Lost Communication with PCM diagnostic procedure. No  Refer to DIAGNOSIS AND TESTING and perform the Stored Lost Communication DTCs diagnostic procedure. U0001-87-CAN-C BUS MISSING MESSAGE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Continuously when the ignition is on. The battery voltage between 10 and 16 Volts. Body Control Module (BCM) is configured correctly. SET CONDITION: The controller detects an open, short to ground or a short to voltage on the High Speed CAN Bus circuits. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read the DTCs. Is this DTC active at this time? Yes  Refer to U0001-87-CAN C BUS - NO SIGNAL and perform the U0001-87-CAN C BUS - Possible Causes HIGH SPEED CAN BUS CIRCUITS OPEN OR SHORTED DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES ANY HIGH SPEED CAN BUS MODULE 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 NO SIGNAL diagnostic procedure. No  Refer to DIAGNOSIS AND TESTING and perform the Stored Lost Communication DTCs diagnostic procedure. U0001-88-CAN-C BUS OFF For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Ignition on, battery voltage between 9 and 16 volts. SET CONDITION: The Antilock Brake Module (ABS) Module has detected catastrophic failure on the CAN bus. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Ignition on, engine not running. 2. With the scan tool, read the DTCs. Is the DTC Active at this time? Yes  Refer to BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX and perform the appropriate diagnostic procedure. No  Refer to DIAGNOSIS AND TESTING and perform the Stored Lost Communication DTCs diagnostic procedure. Possible Causes CAN BUS CIRCUITS OPEN OR SHORTED DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES BODY CONTROL MODULE (BCM) POWER AND GROUND BODY CONTROL MODULE (BCM) NOT CONFIGURED CORRECTLY BODY CONTROL MODULE (BCM) MODULE THAT SET THIS DTC 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 U1700-86-IMPLAUSIBLE DATA RECEIVED FROM BCM For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Continuously when the ignition is on. The battery voltage between 10 and 16 volts. Body Control Module (BCM) is configured correctly. SET CONDITION: Whenever the communication data sent over the CAN BUS from the Body Control Module (BCM) is missing part of the message, the message is corrupted, or the message is an irrational value. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read active DTCs. Is this DTC active? Yes  Go To 2. No  Go To 3. 2. VERIFY IF THIS DTC SET IN OTHER MODULES 1. Turn the ignition on. 2. With the scan tool, read active DTCs. Are any other modules on the CAN BUS reporting this DTC? Yes Possible Causes BODY CONTROL MODULE MODULE THAT SET THIS DTC 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Replace and program the Body Control Module in accordance with the Service Information. Refer to MODULE, BODY CONTROL, REMOVAL .  Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE . No  Replace and program the module that set this DTC in accordance to the Service Information. Perform its respective verification test. 3. CHECK THE WIRING AND CONNECTORS 1. The conditions necessary to set the DTC are not present at this time. 2. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set. 3. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. 4. Wiggle the wiring and connectors while checking for shorted and open circuits. Were there any problems found? Yes  Repair as necessary.  Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE . No  Test complete. U1700-87-LOST COMMUNICATION WITH BCM For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Continuously when the ignition is on. The battery voltage between 10 and 16 Volts. Body Control Module (BCM) is configured correctly. SET CONDITION: Bus messages not received from the Body Control Module (BCM) for approximately two to five seconds. POSSIBLE CAUSES 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 DIAGNOSTIC TEST 1. VERIFY THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read the active DTCs. Does the scan tool display: U1700-87-LOST COMMUNICATION WITH BCM? Yes  Refer to DIAGNOSIS AND TESTING and perform the NO RESPONSE FROM BCM (BODY CONTROL MODULE) diagnostic procedure. No  Refer to DIAGNOSIS AND TESTING and perform the Stored Lost Communication DTCs diagnostic procedure. U1701-86-IMPLAUSIBLE DATA RECEIVED FROM PCM For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Continuously when the ignition is on. The battery voltage between 10 and 16 volts. Powertrain Control Module (PCM) is configured correctly. SET CONDITION: Whenever the communication data sent over the CAN BUS from the Powertrain Control Module (PCM) is missing part of the message, the message is corrupted, or the message is an irrational value. Possible Causes CAN BUS CIRCUITS OPEN OR SHORTED DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES BODY CONTROL MODULE (BCM) POWER AND GROUND BCM NOT CONFIGURED CORRECTLY BODY CONTROL MODULE (BCM) MODULE THAT SET THIS DTC NOTE: Make sure the battery is fully charged before proceeding. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read active DTCs. Is this DTC active? Yes  Go To 2. No  Go To 3. 2. VERIFY IF THIS DTC SET IN OTHER MODULES 1. Turn the ignition on. 2. With the scan tool, read active DTCs. Are any other modules on the CAN BUS reporting this DTC? Yes  Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL [EAB], REMOVAL or MODULE, POWERTRAIN CONTROL [EAJ], REMOVAL .  Perform the PCM VERIFICATION TEST. Refer to EAB - POWERTRAIN VERIFICATION TEST or EAJ - POWERTRAIN VERIFICATION TEST . No  Replace and program the module that set this DTC in accordance with the Service Information. Perform its respective verification test. 3. CHECK THE WIRING AND CONNECTORS 1. The conditions necessary to set the DTC are not present at this time. 2. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set. 3. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water Possible Causes POWERTRAIN CONTROL MODULE MODULE THAT SET THIS DTC 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 intrusion, corrosion, pushed out or bent terminals, and correct pin tension. 4. Wiggle the wiring and connectors while checking for shorted and open circuits. Were there any problems found? Yes  Repair as necessary.  Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE . No  Test complete. U1701-87-LOST COMMUNICATION WITH PCM For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Continuously when the ignition is on. The battery voltage between 10 and 16 Volts. Body Control Module (BCM) is configured correctly. SET CONDITION: Bus messages not received from the Powertrain Control Module (PCM) for approximately two to five seconds. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE Possible Causes CAN BUS CIRCUITS OPEN OR SHORTED DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES POWERTRAIN CONTROL MODULE POWER AND GROUND BCM NOT CONFIGURED CORRECTLY POWERTRAIN CONTROL MODULE (PCM) MODULE THAT SET THIS DTC NOTE: Make sure the battery is fully charged before proceeding. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 1. Turn the ignition on. 2. With the scan tool, read the active DTCs. Does the scan tool display: U1701-87-LOST COMMUNICATION WITH PCM? Yes  Refer to U1701-87-LOST COMMUNICATION WITH PCM and perform the U1701-87- Lost Communication with PCM diagnostic procedure. No  Refer to DIAGNOSIS AND TESTING and perform the Stored Lost Communication DTCs diagnostic procedure. U1702-86-ABS/EPS SIGNAL INVALID For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Continuously when the ignition is on and the battery voltage is between 10 and 16 volts. Body Control Module (BCM) is configured correctly. SET CONDITION: Whenever the communication data sent over the CAN BUS from the Electric Power Steering (EPS) Module is missing part of the message, the message is corrupted, or the message is an irrational value. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read the DTCs. Is the DTC active at this time? Yes Possible Causes ELECTRONIC POWER STEERING (EPS) MODULE MODULE THAT SET THIS DTC 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Go To 2. No  Go To 3. 2. VERIFY IF THIS DTC SET IN OTHER MODULES 1. Turn the ignition on. 2. With the scan tool, read active DTCs. Are any other modules on the CAN BUS reporting this DTC? Yes  Replace the Electric Power Steering (EPS) module in accordance with the Service Information. Refer to LOCK HOUSING, STEERING COLUMN, REMOVAL .  Perform the EPS VERIFICATION TEST. Refer to STANDARD PROCEDURE . No  Replace and program the module that set this DTC in accordance to the Service Information. Perform its respective verification test. 3. CHECK THE WIRING AND CONNECTORS 1. The conditions necessary to set the DTC are not present at this time. 2. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set. 3. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. 4. Wiggle the wiring and connectors while checking for shorted and open circuits. Were there any problems found? Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. U1702-87-ABS/EPS MISSING MESSAGE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 WHEN MONITORED: Continuously when the ignition is on and the battery voltage is between 10 and 16 Volts. Body Control Module (BCM) is configured correctly. SET CONDITION: Bus messages not received from the Electric Power Steering (EPS) Module for approximately two to five seconds. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read the active DTCs. Is the DTC active at this time? Yes  Refer to U1702-87-LOST COMMUNICATION WITH EPS and perform the U1702-87- Lost Communication with EPS diagnostic procedure. No  Refer to DIAGNOSIS AND TESTING and perform the Stored Lost Communication DTCs diagnostic procedure. U1711-86-IMPLAUSIBLE DATA RECEIVED FROM TCM For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . Possible Causes CAN BUS CIRCUITS OPEN OR SHORTED DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES ELECTRIC POWER STEERING (EPS) MODULE POWER AND GROUND BCM NOT CONFIGURED CORRECTLY ELECTRIC POWER STEERING (EPS) MODULE MODULE THAT SET THIS DTC NOTE: Make sure the battery is fully charged before proceeding. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 WHEN MONITORED: Continuously when the ignition is on. The battery voltage between 10 and 16 volts. Body Control Module (BCM) is configured correctly. SET CONDITION: Whenever the communication data sent over the CAN BUS from the Transmission Control Module (TCM) is missing part of the message, the message is corrupted, or the message is an irrational value. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read active DTCs. Is this DTC active? Yes  Go To 2. No  Go To 3. 2. VERIFY IF THIS DTC SET IN OTHER MODULES 1. Turn the ignition on. 2. With the scan tool, read active DTCs. Are any other modules on the CAN BUS reporting this DTC? Yes  Replace and program the Transmission Control Module (TCM) in accordance with the Service Information. Refer to MODULE, TRANSMISSION CONTROL [EAJ, DDG], REMOVAL or MODULE, TRANSMISSION CONTROL [EAB, DF1], REMOVAL . Possible Causes TRANSMISSION CONTROL MODULE (TCM) MODULE THAT SET THIS DTC 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500  Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE . No  Replace and program the module that set this DTC in accordance to the Service Information. Perform its respective verification test. 3. CHECK THE WIRING AND CONNECTORS 1. The conditions necessary to set the DTC are not present at this time. 2. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set. 3. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. 4. Wiggle the wiring and connectors while checking for shorted and open circuits. Were there any problems found? Yes  Repair as necessary.  Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE . No  Test complete. U1711-87-LOST COMMUNICATION WITH TCM For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Continuously when the ignition is on. The battery voltage between 10 and 16 Volts. Body Control Module (BCM) is configured correctly. SET CONDITION: Bus messages not received from the Transmission Control Module (TCM) for approximately two to five seconds. POSSIBLE CAUSES Possible Causes 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 DIAGNOSTIC TEST 1. VERIFY THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read the active DTCs. Does the scan tool display: U1711-87-LOST COMMUNICATION WITH TCM? Yes  Refer to U1711-87-LOST COMMUNICATION WITH TCM/MTA and perform the U1711-87-Lost Communication with TCM diagnostic procedure. No  Refer to DIAGNOSIS AND TESTING and perform the Stored Lost Communication DTCs diagnostic procedure. U1715-86-YAW RATE SENSOR SIGNAL INVALID For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Continuously when the ignition is on and the battery voltage is between 10 and 16 volts. Body Control Module (BCM) is configured correctly. SET CONDITION: Whenever the communication data sent over the CAN BUS from the Dynamics Sensor is missing part of the message, the message is corrupted, or the message is an irrational value. POSSIBLE CAUSES CAN BUS CIRCUITS OPEN OR SHORTED DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES TRANSMISSION CONTROL MODULE POWER AND GROUND BCM NOT CONFIGURED CORRECTLY TRANSMISSION CONTROL MODULE (TCM) MODULE THAT SET THIS DTC NOTE: Make sure the battery is fully charged before proceeding. Possible Causes 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read the DTCs. Is the DTC active at this time? Yes  Go To 2. No  Go To 3. 2. VERIFY IF THIS DTC SET IN OTHER MODULES 1. Turn the ignition on. 2. With the scan tool, read active DTCs. Are any other modules on the CAN BUS reporting this DTC? Yes  Replace the Dynamics Sensor in accordance with the Service Information. Refer to SENSOR, DYNAMICS, REMOVAL .  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Replace and program the module that set this DTC in accordance to the Service Information. Perform its respective verification test. 3. CHECK THE WIRING AND CONNECTORS 1. The conditions necessary to set the DTC are not present at this time. 2. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set. 3. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. 4. Wiggle the wiring and connectors while checking for shorted and open circuits. Were there any problems found? DYNAMICS SENSOR MODULE THAT SET THIS DTC 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Yes  Repair as necessary.  Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test complete. U1715-87-YAW RATE SENSOR MISSING MESSAGE For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . WHEN MONITORED: Continuously when the ignition is on. The battery voltage between 10 and 16 Volts. Body Control Module (BCM) is configured correctly. SET CONDITION: Bus messages not received from the Dynamics Sensor for approximately two to five seconds. POSSIBLE CAUSES DIAGNOSTIC TEST 1. VERIFY THE DTC IS ACTIVE 1. Turn the ignition on. 2. With the scan tool, read the active DTCs. Does the scan tool display: U1715-87-LOST COMMUNICATION WITH YRS? Possible Causes CAN BUS CIRCUITS OPEN OR SHORTED DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES DYNAMICS SENSOR POWER AND GROUND BCM NOT CONFIGURED CORRECTLY DYNAMICS SENSOR MODULE THAT SET THIS DTC NOTE: Make sure the battery is fully charged before proceeding. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 Yes  Refer to U1715-87-LOST COMMUNICATION WITH YRS and perform the U1715-87- Lost Communication with YRS diagnostic procedure. No  Refer to DIAGNOSIS AND TESTING and perform the Stored Lost Communication DTCs diagnostic procedure. STANDARD PROCEDURE ABS INTERMITTENT CONDITION For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article . DIAGNOSTIC TEST 1. PERFORM ABS INTERMITTENT CONDITION TEST 1. Perform any Technical Service Bulletins (TSBs) that may apply. 2. Review the scan tool Environmental Data (EV Data). If possible, try to duplicate the conditions under which the DTC set. 3. Turn the ignition off. 4. Visually inspect the related wire harness. Disconnect all the related harness connectors. Look for any chafed, pierced, pinched, partially broken wires and broken, bent, pushed out, or corroded terminals. 5. Wiggle the wires while checking for shorts and open circuits. 6. Perform a voltage drop test on the related circuits between the suspected inoperative component and the Anti-Lock Brake Module. 7. Inspect and clean all PCM, ABS, engine, and chassis grounds that are related to the most current DTC. 8. If numerous trouble codes were set, use a wire schematic and look for any common ground or supply circuits 9. For any Relay DTCs, actuate the Relay with the scan tool and wiggle the related wire harness to try to interrupt the actuation. NOTE: The conditions that set the DTC are not present at this time. The following list may help in identifying the intermittent condition. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 10. Use the scan tool to perform a System Test if one applies to failing component. 11. A co-pilot, data recorder, or lab scope should be used to help diagnose intermittent conditions. 12. Test drive the vehicle over 15 km/h (9 mph). Were any problems found during the above inspections? Yes  Perform the necessary repairs.  Perform ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST. No  Test Complete, the condition or conditions that originally set this DTC are not present at this time. ABS VERIFICATION TEST DIAGNOSTIC TEST 1. ABS VERIFICATION TEST 1. Turn the ignition off. 2. Connect all previously disconnected components and connectors. 3. Verify all accessories are turned off and the battery is fully charged. 4. Verify that the ignition is on, with the scan tool, erase all Diagnostic Trouble Codes from All modules. Start the engine and allow it to run for two minutes and fully operate the system that was indicating the failure. 5. Turn the ignition off and wait five seconds. Turn the ignition on and using the scan tool, read DTCs from all modules. 6. If any Diagnostic Trouble Codes are present, Refer to DIAGNOSIS AND TESTING and perform WARNING: To avoid possible serious or fatal injury, check brake capability is available before road testing. NOTE: If the Anti-Lock Brake System (ABS) Module, Clockspring/Steering Angle Sensor (SAS), or Dynamics Sensor were replaced, or if any mounting problems with Clockspring/SAS or Dynamics Sensor, ABS Module must be initialized using the scan tool. If not initialized, the ABS indicator will flash continuously with no DTCs. To initialize the ABS Module and clear offsets have wheels pointing straight ahead and follow the directions on the scan tool. The drive test requires a 90° turn. If the Dynamics Sensor was replaced, test drive the vehicle by turning the vehicle left or right in a curving manner at a velocity between 10 and 25 km/h (6 and 15 mph). 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 the diagnostic procedure. 7. If there are no DTCs present after turning ignition on, road test the vehicle for at least five minutes. Perform several antilock braking stops. 8. If there are no DTCs present after turning ignition on, road test the vehicle for at least five minutes.  Slowly turn the steering wheel from lock to lock.  Test drive the vehicle by turning the vehicle left or right in a curving manner at a speeds between 10 and 25 km/h (6 and 15 mph).  Perform several antilock braking stops. 9. Again, with the scan tool read DTCs. If any DTCs are present, Refer to DIAGNOSIS AND TESTING for the diagnostic procedure and troubleshoot the new or recurring DTC. 10. If there are no Diagnostic Trouble Codes (DTCs) present, and the customer's concern can no longer be duplicated, the repair is complete. Are any DTCs present or is the original concern still present? Yes  Repair is not complete, perform the appropriate diagnostic procedure. Refer to DIAGNOSIS AND TESTING. No  Repair is complete. NOTE: For Sensor Signal Plausibility and Pump Motor faults, the ABS Module must verify that the failure conditions are no longer present in the current ignition cycle before it can turn off the failure lamp(s). This may require the vehicle to be driven for several minutes above 15 k/mh (9 mph). Once it has been determined that the failure condition is no longer present the lamp(s) will be turned off. 2012 BRAKES Antilock Brake System - Electrical Diagnostics - Fiat 500 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 CAUTION CAUTION The antilock brake system uses an electronic control module known as the Antilock Brake Module (ABM). This module is designed to withstand normal current draws associated with vehicle operation. Care must be taken to avoid overloading the circuits. CAUTION: In testing for open or short circuits, do not ground or apply voltage to any of the circuits unless instructed to do so for a diagnostic procedure. CAUTION: These circuits should only be tested using a high impedance multi-meter or the designated scan tool as described in this service information. Power should never be removed or applied to any control module with the ignition in the ON position. Before removing or connecting battery cables, fuses, or connectors, always turn the ignition to the OFF position. CAUTION: The ABM 47-way connector should never be connected or disconnected with the ignition switch in the ON position. CAUTION: This vehicle utilizes active wheel speed sensors. Do not apply voltage to wheel speed sensors at any time. CAUTION: Use only factory wiring harnesses. Do not cut or splice wiring to the brake circuits. The addition of aftermarket electrical equipment (car phone, radar detector, citizen band radio, trailer lighting, trailer brakes, etc.) on a vehicle equipped with antilock brakes may affect the function of the antilock brake system. CAUTION: When performing any service procedure on a vehicle equipped with ABS, do not apply a 12-volt power source to the ground circuit of the pump motor in the HCU. Doing this will damage the pump motor and will require replacement of the entire HCU. CAUTION: An attempt to remove or disconnect certain system components may result in improper system operation. Only those components with approved removal and installation procedures in this information should be serviced. 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 5002012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 DESCRIPTION ANTILOCK BRAKE SYSTEM This vehicle uses an antilock brake system standard with Electronic Stability Control (ESC) and All-Speed Traction Control. This antilock brake system uses components of the base brake system, but also features the following components:  Integrated Control Unit (ICU) - Hydraulic Control Unit (HCU) (2) and Antilock Brake Module (ABM) (1)  Wheel Speed Sensors (WSS) - Four sensors (one at each wheel)  Steering Angle Sensor - Part of the Steering Column Module.  Dynamics Sensor Module - Includes Yaw rate and lateral acceleration sensors The ABS system is made up of the Hydraulic Control Unit (HCU) and the Antilock Brake Module (ABM). For additional information on these components. Refer to HYDRAULIC CONTROL UNIT (HCU), DESCRIPTION and MODULE, ANTI-LOCK BRAKE SYSTEM, DESCRIPTION . ABS The purpose of the antilock brake system (ABS) is to prevent wheel lockup under braking conditions on virtually any type of road surface. Antilock braking is desirable because a vehicle that is stopped without locking the wheels retains directional stability and some steering capability. This allows the driver to retain greater control of the vehicle during braking. All vehicles use Electronic Variable Brake Proportioning (EVBP) to balance front-to-rear braking when the brakes are applied in the partial braking range. For more information on electronic brake distribution. Refer to ELECTRONIC VARIABLE BRAKE PROPORTIONING . CAUTION: If welding work is to be performed on the vehicle using an electric arc welder, the ABM connector should be disconnected during the welding operation. CAUTION: Many components of the ABS are not serviceable and must be replaced as an assembly. Do not disassemble any component which is not designed to be serviced. CAUTION: Brake fluid will damage painted surfaces. If brake fluid is spilled on any painted surface, wash off with water immediately. CAUTION: Only the recommended jacking or hoisting positions for this vehicle are to be used whenever it is necessary to lift a vehicle. 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 ELECTRONIC STABILITY CONTROL For information on the Electronic Stability Control. Refer to ELECTRONIC STABILITY CONTROL. TRACTION CONTROL For information on the All-Speed Traction Control. Refer to TRACTION CONTROL. ELECTRONIC STABILITY CONTROL Electronic Stability Control (ESC), which includes Hydraulic Brake Assist, Traction Control, Electronic Roll Mitigation, and Brake Lock Differentials is standard on all vehicles. ESC aids the driver in maintaining vehicle directional stability. ESC will do whatever can be done, within the limits of available traction, to keep the car on course. ESC uses the ABS with Traction Control along with the following components to operate:  Dynamics (ESC) Sensor  Steering Angle Sensor (SAS) The Dynamics Sensor that is mounted under the center console, which is near the center of gravity of the car for effective sensing. Refer to SENSOR, DYNAMICS, DESCRIPTION. The Steering Angle Sensor is located in the steering column. Refer to SENSOR, STEERING WHEEL ANGLE, DESCRIPTION. On this vehicle, ESC has three modes: Full-On, Partial and Full-Off. The ESC default mode is Full-On with every key-on. Pressing the ESC Off switch button in the center stack once activates the Partial mode. In Partial mode, Traction Control is deactivated and ESC operates at a higher threshold, therefore, it will not come on as aggressively as in the Full-On mode. Pressing and holding the ESC Off switch button for five seconds or longer turns the system completely off. This condition is confirmed by a single warning chime and a text message in the odometer display "ESC FULL OFF." The system can be returned to "normal" Full-On mode by briefly pressing and releasing the ESC Off switch. HYDRAULIC BRAKE ASSIST Brake Assist is programmed into the ESC system. Brake assist helps the driver overcome the tendency to not apply the brakes hard enough or quick enough to achieve the minimum stopping distance during a panic stop. During this situation, the ESC system instantly applies the maximum available pressure to the brakes and the vehicle stops as quickly as available traction will allow. TRACTION CONTROL For information on the All-Speed Traction Control. Refer to TRACTION CONTROL. TRACTION CONTROL The traction control system that is part of the Electronic Stability Control (ESC®), is an all-speed traction control. All-Speed Traction Control enhances mobility and prevents wheel slip when accelerating on slippery surfaces. It also provides a measure of directional stability control. Using the wheel-speed sensors, it can detect 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 excessive yaw and help keep the car on the intended course, as for instance, when accelerating around a curve. All-Speed Traction Control is effective up to 85 mph (137 km/h). The traction control system may be turned off or on by depressing the ESC Off switch button. The button is either located on the instrument panel or in the shifter housing, depending on transmission. ELECTRONIC VARIABLE BRAKE PROPORTIONING Vehicles equipped with ABS use Electronic Variable Brake Proportioning (EVBP) to balance front-to-rear braking. The EVBP is used in place of a rear proportioning valve. The EVBP system uses the ABS system to control the slip of the rear wheels in partial braking range. The braking force of the rear wheels is controlled electronically by using the inlet and outlet valves located in the Integrated Control Unit (ICU). OPERATION ANTILOCK BRAKE SYSTEM ABS There are a few performance characteristics of the Antilock Brake System (ABS) that may at first seem abnormal, but in fact are normal. These characteristics are described below. NORMAL BRAKING Under normal braking conditions, the ABS functions the same as a standard base brake system with a diagonally split master cylinder and conventional vacuum assist. ABS BRAKING ABS operation is available at all vehicle speeds above 5-8 km/h (3-5 mph) If a wheel locking tendency is detected during a brake application, the brake system enters the ABS mode. During ABS braking, hydraulic pressure in the four wheel circuits is modulated to prevent any wheel from locking. Each wheel circuit is designed with a set of electric solenoids to allow modulation, although for vehicle stability, both rear wheel solenoids receive the same electrical signal. Wheel lockup may be perceived at the very end of an ABS stop and is considered normal. During an ABS event, the Integrated Control Unit (ICU) regulates hydraulic pressure at all four of the vehicle's wheels. The hydraulic pressure at each front wheel is controlled independently (relative to the amount of slip at each wheel) in order to maximize the braking force generated by the front brakes. The rear wheels are controlled such that the hydraulic pressure at either rear wheel does not exceed that of the highest slip rear wheel in order to maintain vehicle stability. The system can build and release pressure at each wheel, depending on signals generated by the Wheel Speed Sensors (WSS) at each wheel and received at the Antilock Brake Module (ABM). 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 NOISE AND BRAKE PEDAL FEEL During ABS braking, some brake pedal movement may be felt. In addition, ABS braking will create ticking, popping, or groaning noises heard by the driver. This is normal and is due to pressurized fluid being transferred between the master cylinder and the brakes. If ABS operation occurs during hard braking, some pulsation may be felt in the vehicle body due to fore and aft movement of the suspension as brake pressures are modulated. At the end of an ABS stop, ABS is turned off when the vehicle is slowed to a speed of 5-6 km/h (3-4 mph). There may be a slight brake pedal drop anytime that the ABS is deactivated, such as at the end of the stop when the vehicle speed is less than 3 mph (5 km/h) or during an ABS stop where ABS is no longer required. These conditions exist when a vehicle is being stopped on a road surface with patches of ice, loose gravel, or sand on it. Also, stopping a vehicle on a bumpy road surface activates ABS because of the wheel hop caused by the bumps. TIRE NOISE AND MARKS Although the ABS system prevents complete wheel lockup, some wheel slip is desired in order to achieve optimum braking performance. Wheel slip is defined as follows: 0 percent slip means the wheel is rolling freely and 100 percent slip means the wheel is fully locked. During brake pressure modulation, wheel slip is allowed to reach up to 25-30 percent. This means that the wheel rolling velocity is 25-30 percent less than that of a free rolling wheel at a given vehicle speed. This slip may result in some tire chirping, depending on the road surface. This sound should not be interpreted as total wheel lockup. Complete wheel lockup normally leaves black tire marks on dry pavement. The ABS will not leave dark black tire marks since the wheel never reaches a fully locked condition. However, tire marks may be noticeable as light patched marks. START-UP AND DRIVE-OFF CYCLES When the ignition is turned on, a popping sound and a slight brake pedal movement may be noticed. The ABS warning lamp will also be on for up to 5 seconds after the ignition is turned on. When the vehicle is first driven off, a humming may be heard or felt by the driver at approximately 12-25 mph (20-40 km/h). All of these conditions are a normal function of ABS as the system is performing a diagnosis check. PREMATURE ABS CYCLING Symptoms of premature ABS cycling include: clicking sounds from the solenoid valves; pump/motor running; and pulsations in the brake pedal. Premature ABS cycling can occur at any braking rate of the vehicle and on any type of road surface. Neither the red BRAKE indicator lamp, nor the amber ABS indicator lamp, illuminate and no faults are stored in the ABM. Premature ABS cycling is a condition that needs to be correctly assessed when diagnosing problems with the antilock brake system. It may be necessary to use a scan tool to detect and verify premature ABS cycling. Check the following common causes when diagnosing premature ABS cycling: damaged wheel bearings (causing tone wheel issues); damaged wheel speed sensor mounting bosses; and loose wheel speed sensor 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 mounting screws. After diagnosing the defective component, repair or replace it as required. When the component repair or replacement is completed, test drive the vehicle to verify that premature ABS cycling has been corrected. ELECTRONIC STABILITY CONTROL For information on the Electronic Stability Control. Refer to ELECTRONIC STABILITY CONTROL. TRACTION CONTROL For information on the All-Speed Traction Control. Refer to TRACTION CONTROL. ELECTRONIC STABILITY CONTROL To determine whether the car is responding properly to cornering commands, ESC uses steering wheel angle, yaw (turning) rate and lateral acceleration sensors (combined into Dynamics Sensor). Using signals from these sensors, in addition to individual wheel speed sensor signals, the system determines appropriate brake and throttle actions. Once initiated, ESC operates much like All-Speed Traction Control, except that the goal is directional stability. If the vehicle yaw response, or rate of turning, is inconsistent with the steering angle and vehicle speed indications, the ESC system applies the brakes and, if necessary closes the throttle, to restore control. This occurs whether the vehicle is turning too rapidly (oversteering) or not rapidly enough (understeering). HYDRAULIC BRAKE ASSIST Brake Assist is programmed into the ESC system. During a panic stop, a pressure sensor determines when the driver is doing so by measuring the brake pedal pressure application rate. A high rate of pedal pressure application causes the ESC system to apply maximum available pressure to the brakes and the vehicle stops as quickly as available traction will allow. TRACTION CONTROL For information on the All-Speed Traction Control. Refer to TRACTION CONTROL. TRACTION CONTROL Traction control systems sense impending wheel spin based on a model of the rate of change of wheel speed under normal traction conditions. The All-Speed Traction Control uses signals from the same wheel speed sensors as ABS to determine when to apply the brakes to one or more wheels and when to reduce engine torque output using the electronic throttle control (ETC) to prevent wheel slip during acceleration. Throttle control makes the vehicle less reliant on brake application alone to maintain traction, increasing the operating speed range and more closely modulates speed, resulting in smoother operation. With All-Speed Traction Control reducing engine torque as well as applying the brakes, it is possible to achieve almost seamless torque application at the wheels. If the wheel slip is severe enough to require throttle intervention, All-Speed Traction Control will reduce engine torque and sometimes upshift the transmission to avoid the condition. In milliseconds, All-Speed Traction 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Control interrogates the engine control system to determine the current torque output, determines how much the torque output the current conditions will allow, and signals this requirement to the engine control system, which reduces the torque by partially closing the throttle. With execution of the torque reduction, the brake system reduces brake pressure to make the transition smooth, while maintaining forward progress. By reducing engine power, braking effectiveness is maintained and the system can operate throughout the normal vehicle speed range. That is why the system is identified as providing "all-speed" traction control. The traction control system is enabled at each ignition cycle. It may be turned off by depressing the ESC OFF switch button. The ESC/TCS function indicator lamp illuminates immediately upon depressing the button. Pressing this button again or turning off and restarting the vehicle will enable the traction control system. ELECTRONIC VARIABLE BRAKE PROPORTIONING Upon entry into EVBP, the inlet valve for the rear brake circuit is switched on so that the fluid supply from the master cylinder is shut off. In order to decrease the rear brake pressure, the outlet valve for the rear brake circuit is pulsed. This allows fluid to enter the Low Pressure Accumulator (LPA) in the Hydraulic Control Unit (HCU) resulting in a drop in fluid pressure to the rear brakes. In order to increase the rear brake pressure, the outlet valve is switched off and the inlet valve is pulsed. This increases the pressure to the rear brakes. This back-and- forth process will continue until the required slip difference is obtained. At the end of EVBP braking (brakes released) the fluid in the LPA is pumped back to the master cylinder by switching on the motor for ABS systems or by opening the ESVs for ESC systems. At the same time the inlet valve is switched on in case of another brake application. The EVBP will remain functional during many ABS fault modes. If both the red BRAKE and amber ABS warning indicators are illuminated, the EVBP may not be functioning. DIAGNOSIS AND TESTING DIAGNOSIS AND TESTING - INSPECTION AND ROAD TEST 1. Visually inspect the ABS for damaged or disconnected components and connectors. 2. Verify the brake lamps are operational. If they are not, repair them prior to continuing. 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 1: Locating Data Link Connector Courtesy of CHRYSLER GROUP, LLC 3. Connect a scan tool to the Data Link Connector located under the instrument panel to the left of the steering column (1). If the scan tool does not power-up, check the power and ground supplies to the connector. 4. Turn the ignition key to the ON position. 5. Using the scan tool, read and record any Diagnostic Trouble Codes (DTCs). If any DTCs are present, refer to the appropriate diagnostic information. If no problems are observed, it will be necessary to road test the vehicle. Many ABS conditions judged to be a problem by the driver may be normal operating conditions. To become familiarized with the normal operating characteristics of this antilock brake system. Refer to OPERATION . Before road testing a brake complaint vehicle, note whether the red BRAKE warning indicator lamp, amber ABS warning indicator lamp, or both are turned on. If it is the red BRAKE warning indicator, there is a brake hydraulic problem that must be corrected before driving the vehicle. Refer to DIAGNOSIS AND TESTING - BASE BRAKE SYSTEM DIAGNOSIS CHARTS . If the amber ABS warning indicator is on, road test the vehicle as described below. While only the amber ABS warning indicator is on, the ABS is not functional. The ability to stop the car using the base brake system should not be affected. 6. Turn the key to the OFF position and then back to the ON position. Note whether the amber ABS warning WARNING: Conditions that result in turning on the red brake warning indicator lamp may indicate reduced braking ability. 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 indicator lamp continues to stay on. 7. If the amber ABS warning indicator lamp stays on, shift into gear and drive the car to a speed of approximately 25 km/h (15 mph) to complete the ABS Start-Up and Drive-Off Cycles. Refer to START- UP AND DRIVE-OFF CYCLES. If at this time the amber ABS warning indicator lamp stays on, refer to the appropriate diagnostic information. 8. If the amber ABS warning indicator lamp goes out at any time, drive the vehicle a short distance. Accelerate the vehicle to a speed of at least 64 km/h (40 mph). Bring the vehicle to a complete stop, braking hard enough to cause the ABS to cycle. Repeat this action several times. Using the scan tool, read and record any Diagnostic Trouble Codes (DTCs). If any DTCs are present, refer to the appropriate diagnostic information. STANDARD PROCEDURE STANDARD PROCEDURE - ANTILOCK BRAKE SYSTEM BLEEDING The base brake's hydraulic system must be bled anytime air enters the hydraulic system. The ABS must always be bled anytime it is suspected that the HCU has ingested air. Brake systems with ABS must be bled as two independent braking systems. The non-ABS portion of the brake system with ABS is to be bled the same as any non-ABS system. The ABS portion of the brake system must be bled separately. Use the following procedure to properly bleed the brake hydraulic system including the ABS. BLEEDING When bleeding the ABS system, the following bleeding sequence must be followed to insure complete and adequate bleeding. 1. Make sure all hydraulic fluid lines are installed and properly torqued. 2. Connect the scan tool to the diagnostics connector. The diagnostic connector is located under the lower steering column cover to the left of the steering column. 3. Using the scan tool, check to make sure the ABM does not have any fault codes stored. If it does, clear them. NOTE: During the brake bleeding procedure, be sure the brake fluid level remains close to the FULL level in the master cylinder fluid reservoir. Check the fluid level periodically during the bleeding procedure and add Mopar® DOT 3 brake fluid as required. 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 2: Clear Plastic Hose & Jar For Brake Fluid Bleeding Courtesy of CHRYSLER GROUP, LLC 4. Bleed the base brake system. Refer to Brakes - Standard Procedure. 5. Using the scan tool, select ECU VIEW, followed by ABS MISCELLANEOUS FUNCTIONS to access bleeding. Follow the instructions displayed. When finished, disconnect the scan tool and proceed. 6. Bleed the base brake system a second time. Check brake fluid level in the reservoir periodically to prevent emptying, causing air to enter the hydraulic system. WARNING: When bleeding the brake system wear safety glasses. A clear bleed tube (1) must be attached to the bleeder screws and submerged in a clear container filled part way with clean brake fluid (2). Direct the flow of brake fluid away from yourself and the painted surfaces of the vehicle. Brake fluid at high pressure may come out of the bleeder screws when opened. NOTE: Pressure bleeding is recommended to bleed the base brake system to ensure all air is removed from system. Manual bleeding may also be used, but additional time is needed to remove all air from system. 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 3: Master Cylinder Fill Markings Courtesy of CHRYSLER GROUP, LLC 7. Fill the master cylinder fluid reservoir (1) to the FULL level. 8. Test drive the vehicle to be sure the brakes are operating correctly and that the brake pedal does not feel spongy. SPECIFICATIONS TORQUE SPECIFICATIONS For ABS fastener torque specifications, see Brake Fastener Torque. Refer to SPECIFICATIONS . ELECTRICAL SENSOR, DYNAMICS DESCRIPTION DESCRIPTION 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 4: Dynamics Sensor Assembly Courtesy of CHRYSLER GROUP, LLC The Yaw Rate and Lateral Acceleration Sensors are housed into one unit known as the Dynamics Sensor (2). The sensor is used to measure side-to-side (Lateral) motion and vehicle rotational sensing (how fast the vehicle is turning - Yaw). Yaw and Lateral Acceleration Sensors cannot be serviced separately. The entire Dynamics Sensor must be replaced when necessary. REMOVAL REMOVAL Fig. 5: Dynamics Sensor Assembly Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 1. Disconnect and isolate the battery negative cable from the battery post. 2. Remove the floor console. Refer to CONSOLE, FLOOR, REMOVAL . 3. Disconnect the wiring harness connector (1) at the dynamics sensor (2). 4. Remove the two bolts (3) mounting the dynamics sensor to the floor pan tunnel. 5. Remove the dynamics sensor (2). INSTALLATION INSTALLATION Fig. 6: Dynamics Sensor Assembly Courtesy of CHRYSLER GROUP, LLC 1. Install the dynamics sensor (2) to the floor pan tunnel. 2. Install the two mounting bolts (3) and tighten the bolts to 9 N.m (80 in. lbs.). 3. Connect the wiring harness connector (1) to the dynamics sensor (2). 4. Install the center floor console. Refer to CONSOLE, FLOOR, INSTALLATION . 5. Reconnect the negative battery cable. 6. Perform the Verification Test and clear any faults. Refer to ABS VERIFICATION TEST . SENSOR, STEERING WHEEL ANGLE DESCRIPTION DESCRIPTION 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 7: Steering Wheel Clockspring Assembly Courtesy of CHRYSLER GROUP, LLC The steering angle sensor is an integral part of the clockspring (9) mounted on the steering column. Refer to CLOCKSPRING, DESCRIPTION . SENSOR, WHEEL SPEED, FRONT DESCRIPTION DESCRIPTION Fig. 8: Front Wheel Speed Sensor & Fastener Courtesy of CHRYSLER GROUP, LLC The antilock brake system uses two-wire wheel speed sensors, known as active wheel speed sensors. The sensors use an electronic principle known as magnetoresistive to help increase performance and durability. The 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 sensors convert wheel speed into a small digital signal. A Wheel Speed Sensor (WSS) is used at each wheel. A magnetic pole encoder serves as the trigger mechanism for each sensor. At each wheel of the vehicle there is one wheel speed sensor and one encoder. A front wheel speed sensor (2) is attached to a mounting boss on each front knuckle. The encoder is an integral part of the hub and bearing. WSS air gaps are not adjustable. REMOVAL REMOVAL Fig. 9: Wheel Speed Sensor Cable Connector & Retainers Courtesy of CHRYSLER GROUP, LLC 1. Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE . 2. Disconnect the wheel speed sensor cable connector (1) from the wiring harness connector on the inner fender. 3. Separate sensor cable clips from retainers (2, 3). NOTE: Before proceeding. Refer to CAUTION. Refer to WARNING . 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 10: Speed Sensor Cable Routing Clips Courtesy of CHRYSLER GROUP, LLC 4. Remove the speed sensor cable routing clips (1, 2, 3) from retainers. Fig. 11: Front Wheel Speed Sensor & Fastener Courtesy of CHRYSLER GROUP, LLC 5. Remove the mounting screw (1) fastening the wheel speed sensor head (2) to the knuckle. Pull the sensor head out of the knuckle and remove the wheel speed cable from the vehicle. INSTALLATION INSTALLATION 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 12: Front Wheel Speed Sensor & Fastener Courtesy of CHRYSLER GROUP, LLC 1. Install the wheel speed sensor head (2) into the knuckle. Install the mounting screw (1) and tighten it to 7 N.m (62 in. lbs.). 2. Install the routing clip securing the wheel speed sensor cable to the knuckle. Fig. 13: Speed Sensor Cable Routing Clips Courtesy of CHRYSLER GROUP, LLC 3. Route the wheel speed sensor cable as shown in illustration and clip into location (1, 2, & 3). CAUTION: Failure to install speed sensor cables properly may result in contact with moving parts or an over extension of cables causing an open circuit. Be sure that cables are installed, routed, and clipped properly. 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 14: Wheel Speed Sensor Cable Connector & Retainers Courtesy of CHRYSLER GROUP, LLC 4. Route the wheel speed sensor cable as shown in illustration and clip into location (2, 3). 5. Connect wheel speed sensor cable (1) to wiring harness. 6. Lower the vehicle. 7. Perform the Diagnostic Verification Test and clear any faults. Refer to ABS VERIFICATION TEST . SENSOR, WHEEL SPEED, REAR DESCRIPTION DESCRIPTION Fig. 15: Spindle To Axle Bolts & Rear Wheel Speed Sensor Screw Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 The antilock brake system uses two-wire wheel speed sensors, known as active wheel speed sensors. The sensors use an electronic principle known as magnetoresistive to help increase performance and durability. The sensors convert wheel speed into a small digital signal. A Wheel Speed Sensor (WSS) is used at each wheel. A magnetic pole encoder serves as the trigger mechanism for each sensor. At each wheel of the vehicle there is one wheel speed sensor and one encoder. The rear wheel speed sensor head is secured to the spindle assembly by a bolt (2). The encoder is integral to the hub and bearing assembly. The encoder is serviced as part of the rear hub and bearing. The WSS air gaps are not adjustable. REMOVAL REMOVAL Fig. 16: Wheel Speed Sensor Cable Connectors Courtesy of CHRYSLER GROUP, LLC 1. Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE . 2. Disconnect the wheel speed sensor cable connector (1) at the body wiring harness connector (2). NOTE: Before proceeding. Refer to CAUTION. Refer to WARNING . 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 17: Spindle To Axle Bolts & Rear Wheel Speed Sensor Screw Courtesy of CHRYSLER GROUP, LLC 3. Separate the wheels speed sensor cable from all retainers and clips. 4. Remove the screw (2) fastening the wheel speed sensor head in the spindle assembly. Remove the sensor from the vehicle. INSTALLATION INSTALLATION Fig. 18: Spindle To Axle Bolts & Rear Wheel Speed Sensor Screw Courtesy of CHRYSLER GROUP, LLC 1. Install the wheel speed sensor head into the rear of the hub and bearing. 2. Install the wheel speed sensor head mounting screw (2) and tighten to 7 N.m (62 in. lbs.). 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 19: Wheel Speed Sensor Cable Connectors Courtesy of CHRYSLER GROUP, LLC 3. Route wheel speed sensor cable and snap into clips and retainers. 4. Connect wheel speed sensor cable connector (1) to body wiring harness connector (2). 5. Lower the vehicle. SWITCH, ELECTRONIC STABILITY PROGRAM (ESP) DESCRIPTION DESCRIPTION On vehicles equipped with an automatic transmission, the Electronic Stability Control (ESC) Switch is located in the shifter housing bezel. On vehicle equipped with a manual transmission, the ESC Switch is part of the center stack bezel. It is serviced as an assembly along with the other switches in the bezel. The ESC Off switch turns the Electronic Stability Control off and back on. The system resets to ESC-on each time the ignition is cycled. When the ESC Off switch is depressed and released, turning ESC off, it does not completely turn the system off. The ESC system reduces torque management to a lesser amount, but ESC function can still occur if the system perceives the need. HYDRAULIC/MECHANICAL HYDRAULIC CONTROL UNIT (HCU) DESCRIPTION DESCRIPTION 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 The Hydraulic Control Unit (HCU) is mounted to the Antilock Brake Module (ABM) as part of the Integrated Control Unit (ICU). The HCU controls the flow of brake fluid to the brakes using a series of valves and accumulators. A pump/motor is mounted on the HCU to empty the accumulators during an ABS stop and supply build pressure to the brakes during a traction control or ESC event. VALVES AND SOLENOIDS The valve block contains four inlet valves and four outlet solenoid valves. The inlet valves are spring-loaded in the open position and the outlet valves are spring-loaded in the closed position during normal braking. The fluid is allowed to flow from the master cylinder to the wheel brakes. During an ABS stop, these valves cycle to maintain the proper slip ratio for each wheel. The inlet valve closes preventing further pressure increase and the outlet valve opens to provide a path from the wheel brake to the HCU accumulators and pump/motor. This releases (decays) pressure from the wheel brake, thus releasing the wheel from excessive slippage. Once the wheel is no longer slipping, the outlet valve is closed and the inlet valve is opened to reapply (build) pressure. If the ABS includes the traction control feature, there are four other valves in the HCU. Two Traction Control (TC) (or ESC) valves, mounted in the HCU valve block, are normally in the open position and close only when the traction control is applied. There are also two normally closed shuttle valves which open during traction control and ESC events to provide a direct fluid path from the brake fluid reservoir to the inlet of the HCU pump. These TC valves are used to isolate the rear (non-driving) wheels of the vehicle from the hydraulic pressure that the HCU pump/motor is sending to the front (driving) wheels when traction control is being applied. The rear brakes need to be isolated from the master cylinder when traction control is being applied so the rear wheels do not drag. BRAKE FLUID ACCUMULATORS There are two fluid accumulators in the HCU: one for the primary hydraulic circuit, and one for the secondary hydraulic circuit. Each hydraulic circuit uses a 3 cc accumulator. The fluid accumulators temporarily store brake fluid that is removed from the wheel brakes during an ABS cycle. This stored fluid is used by the pump/motor to provide build pressure for the brake hydraulic system. When the antilock stop is complete, the accumulators are drained by the pump/motor. There are two noise dampening chambers in the HCU on this vehicle equipped with traction control. PUMP/MOTOR There are two pump assemblies in the HCU: one for the primary hydraulic circuit, and one for the secondary hydraulic circuit. Both pumps are driven by a common electric motor. This DC-type motor is integral to the HCU and is controlled by the ABM. Brake fluid is released to the accumulators when the outlet valve is opened during an antilock stop. The pump mechanism consists of two opposing pistons operated by an eccentric camshaft. In operation, these pistons are used to purge fluid from the accumulators back into the master cylinder circuits. When the antilock stop is 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 complete, the pump/motor drains the accumulators. The pump motor is also used to build pressure when the system goes into Electronic Stability Control (ESC) and traction control mode. The ABM may turn on the pump/motor when an antilock stop is detected. The pump/motor continues to run during the antilock stop and is turned off after the stop is complete. Under some conditions, the pump/motor runs to drain the accumulators during the next drive-off. The pump/motor is not a serviceable item; if it requires replacement, the HCU must be replaced. REMOVAL REMOVAL To remove the HCU, the ICU must be removed and disassembled. Refer to INTEGRATED CONTROL UNIT (ICU), REMOVAL and INTEGRATED CONTROL UNIT (ICU), DISASSEMBLY. INSTALLATION INSTALLATION To install the HCU, assemble and install the ICU. Refer to INTEGRATED CONTROL UNIT (ICU), ASSEMBLY and INTEGRATED CONTROL UNIT (ICU), INSTALLATION. INTEGRATED CONTROL UNIT (ICU) DESCRIPTION DESCRIPTION Fig. 20: Integrated Control Unit (ICU) Assembly Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 The Hydraulic Control Unit (HCU) and the Antilock Brake Module (ABM) used with this antilock brake system are combined (integrated) into one unit, which is called the Integrated Control Unit (ICU). The ICU (3) is located in the engine compartment, mounted to the left side body frame rail near the brake master cylinder. The ABS with ESC and All-Speed Traction Control ICU consists of the following components: the ABM, 12 (build/decay) solenoid valves, two traction control solenoid valves, two hydraulic shuttle valves, valve block, fluid accumulators, a pump, and an electric pump/motor. The replaceable components of the ICU are the HCU and the ABM. No attempt should be made to service any components of the HCU or ABM. For additional information on the ABM. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, DESCRIPTION . For additional information on the HCU, refer to HYDRAULIC CONTROL UNIT (HCU), DESCRIPTION. OPERATION OPERATION For information of the ICU, refer to these individual components of the ICU:  ANTILOCK BRAKE MODULE (ABM). Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, DESCRIPTION .  HYDRAULIC CONTROL UNIT (HCU). Refer to HYDRAULIC CONTROL UNIT (HCU), DESCRIPTION. REMOVAL REMOVAL 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 21: Brake Pedal Holding Tool Courtesy of CHRYSLER GROUP, LLC 1. Disconnect and isolate battery negative cable from battery post. 2. Remove the battery tray. Refer to TRAY, BATTERY, REMOVAL . 3. Using a brake pedal holding tool as shown in illustration, depress the brake pedal past its first 25 mm (1 inch) of travel and hold it in this position. This will isolate the master cylinder from the brake hydraulic system and will not allow the brake fluid to drain out of the master cylinder reservoir while the lines are disconnected. 4. Remove the engine appearance cover. 5. Pull the brake tube bundle routing clips (with tubes) loose from studs on the dash panel. NOTE: Before proceeding. Refer to CAUTION. Refer to WARNING . 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 22: Antilock Brake Module (ABM) & Connector Cover Courtesy of CHRYSLER GROUP, LLC 6. Disconnect the ABM harness connector from the Antilock Brake Module (ABM). To do so: 1. Lift the connector cover (2) until it locks into position straight up and down. 2. The connector can then be pulled straight up and off the ABM (1). Fig. 23: Integrated Control Unit (ICU) Assembly Courtesy of CHRYSLER GROUP, LLC 7. Remove brake tubes from ICU, including two fittings (4) from the master cylinder. 8. Remove the two mounting screws (5) attaching the ICU (3) mounting bracket to the body. 9. Pull the ICU (3) away from the body to separate mounting pin from body hole (1). 10. Move the brake tubes around as necessary without bending them and remove the ICU with bracket through the opening between the dash panel and engine. 11. To separate the ABM from the HCU, refer to INTEGRATED CONTROL UNIT (ICU), DISASSEMBLY. DISASSEMBLY DISASSEMBLY 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 24: ICU, Bolt & Bracket Courtesy of CHRYSLER GROUP, LLC 1. If the mounting bracket (3) needs to be removed from the ICU, remove the single mounting bolt (2), then slide the ICU's mounting pins out of the grommets in the bracket and remove the bracket. Fig. 25: ICU & Mounting Pins Courtesy of CHRYSLER GROUP, LLC 1 - ICU 2 - MOUNTING BOLT 3 - MOUNTING BRACKET 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 2. Remove the mounting pins from the ICU. Fig. 26: ABM & Mounting Screws Courtesy of CHRYSLER GROUP, LLC 3. Remove the four screws (1) attaching the ABM (2) to the HCU. Fig. 27: ABM Assembly To HCU Courtesy of CHRYSLER GROUP, LLC 1 - MOUNTING SCREWS 2 - ABM 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 4. Separate the ABM (1) from the HCU (2). ASSEMBLY ASSEMBLY 1. Clean any debris off the mating surfaces of the HCU and ABM. Fig. 28: Solenoid Valve Stems & Seals Courtesy of CHRYSLER GROUP, LLC 2. If the seals (1) on the solenoid valve stems (2) are not new, replace them all. Each of the solenoid valve stem seals must be new to keep out moisture and debris;do not reuse solenoid valve stem seals. 1 - ABM 2 - HCU 3 - SOLENOID VALVE STEM CAUTION: When installing new O-rings or solenoid valve stem seals, do not use any type of lubricant. 1 - SEAL 2 - SOLENOID VALVE STEM 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 29: Pump/Motor Connector O-Ring & O-Ring Mounting Groove Courtesy of CHRYSLER GROUP, LLC 3. Replace the pump/motor connector O-ring (1) if it is not new. Be sure the O-ring is properly seated in the mounting groove (2). Fig. 30: ABM Assembly To HCU Courtesy of CHRYSLER GROUP, LLC 1 - O-RING 2 - O-RING MOUNTING GROOVE 1 - ABM 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 4. Align components and install the ABM (1) on the HCU (2). Fig. 31: ABM & Mounting Screws Courtesy of CHRYSLER GROUP, LLC 5. Install the four screws (1) attaching the ABM (2) to the HCU. Tighten the mounting screws to 2 N.m (17 in. lbs.). 2 - HCU 3 - SOLENOID VALVE STEM 1 - MOUNTING SCREWS 2 - ABM 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 32: ICU & Mounting Pins Courtesy of CHRYSLER GROUP, LLC 6. If necessary, install the mounting pins (1) in the ICU (2) and tighten to 11 N.m (97 in. lbs.). Fig. 33: ICU, Bolt & Bracket Courtesy of CHRYSLER GROUP, LLC 7. If the mounting bracket (3) needs to be installed on the ICU (1), install the mounting pins in the ICU as 1 - ICU 2 - MOUNTING BOLT 3 - MOUNTING BRACKET 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 necessary and tighten to 11 N.m (97 in. lbs.). Insert the mounting pins into the grommets mounted in the bracket, then install the single mounting bolt (2). Tighten the mounting bolt to 11 N.m (97 in. lbs.). 8. Install the ICU in the vehicle. Refer to INTEGRATED CONTROL UNIT (ICU), INSTALLATION. INSTALLATION INSTALLATION Fig. 34: Integrated Control Unit (ICU) Assembly Courtesy of CHRYSLER GROUP, LLC 1. Position the Integrated Control Unit (ICU) (3) and insert mounting pin into body hole (1). 2. Install mounting screws (5) and tighten to 23 N.m (17 ft. lbs.). Fig. 35: Antilock Brake Module (ABM) & Connector Cover Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 3. Insert the ABM wiring harness connector (2) into the socket of the ABM (1) and close the cover, locking the connector in place. Fig. 36: Brake Tubes & ICU Hydraulic Control Unit Courtesy of CHRYSLER GROUP, LLC 4. Install the four chassis brake tubes (2, 3, 5, 6) brake tubes at the ICU hydraulic control unit (7). Tighten the tube nuts to 17 N.m (150 in. lbs.). 5. Install the primary (4) and secondary (1) brake tubes at the ICU hydraulic control unit (7). Tighten the tube nuts to 17 N.m (150 in. lbs.). CAUTION: Before installing the ABM harness connector on the ABM, be sure the seal is properly installed in the connector. 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 Fig. 37: Brake Pedal Holding Tool Courtesy of CHRYSLER GROUP, LLC 6. Remove the brake pedal holding tool. 7. Install the engine appearance cover. 8. Reconnect the negative battery cable. Fig. 38: Clear Plastic Hose & Jar For Brake Fluid Bleeding Courtesy of CHRYSLER GROUP, LLC 9. Install a scan tool to initialize the ABM and perform the following: 1. Clear any faults. 2. Fill the master cylinder to the proper fill level and bleed the base and ABS hydraulic systems. Refer to Brakes - Standard Procedure. 3. Check for leaks. 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 10. Perform the Verification Test and clear any faults. Refer to ABS VERIFICATION TEST . 2012 BRAKES Antilock Brake System (ABS) - Service Information - Fiat 500 2012 BRAKES Base - Service Information - Fiat 500 WARNING WARNING CAUTION CAUTION DIAGNOSIS AND TESTING DIAGNOSIS AND TESTING - BASE BRAKE SYSTEM DIAGNOSIS CHARTS WARNING: Chrysler LLC does not manufacture any vehicles or replacement parts that contain asbestos. Aftermarket products may or may not contain asbestos. Refer to aftermarket product packaging for product information. Whether the product contains asbestos or not, dust and dirt can accumulate on brake parts during normal use. Follow practices prescribed by appropriate regulations for the handling, processing and disposing of dust and debris. CAUTION: Use only Mopar® Brake Fluid DOT 3 Motor Vehicle or equivalent from a tightly sealed container. Do not use petroleum-based fluid because seal damage in the brake system will result. Refer to FLUID, SPECIFICATIONS. CAUTION: Brake fluid will damage painted surfaces. If brake fluid is spilled on any painted surfaces, wash it off immediately with water. CAUTION: Never use gasoline, kerosene, alcohol, motor oil, transmission fluid, or any fluid containing mineral oil to clean system components. These fluids damage rubber cups and seals. CAUTION: During service procedures, grease or any other foreign material must be kept off the caliper assembly, brake linings, brake rotor and external surfaces of the hub. CAUTION: When handling the brake rotor and caliper, be careful to avoid damaging the brake rotor and caliper, and scratching or nicking the brake shoe lining. 2012 BRAKES Base - Service Information - Fiat 5002012 BRAKES Base - Service Information - Fiat 500 RED BRAKE WARNING INDICATOR BRAKE NOISE OTHER BRAKE CONDITIONS NOTE: There are three diagnosis charts following that cover the RED BRAKE WARNING INDICATOR, BRAKE NOISE and OTHER BRAKE CONDITIONS. CONDITION POSSIBLE CAUSES CORRECTION RED BRAKE WARNING INDICATOR ON 1. Parking brake lever not fully released. 1. Release parking brake lever. 2. Parking brake warning switch on parking brake lever. 2. Inspect and replace switch as necessary. 3. Brake fluid level low in reservoir. 3. Fill reservoir. Check entire system for leaks. Repair or replace as required. 4. Brake fluid level switch. 4. Disconnect switch wiring connector. If lamp goes out, replace switch. 5. Mechanical instrument cluster (MIC) problem. 5. Refer to appropriate diagnostic information. 6. ABS EVBP malfunction. 6. Refer to ABS service information and appropriate diagnostic information. CONDITION POSSIBLE CAUSES CORRECTION DISC BRAKE CHIRP 1. Excessive brake rotor runout. 1. Diagnose and correct as necessary. Refer to ROTOR, BRAKE, DIAGNOSIS AND TESTING. DISC BRAKE RATTLE OR CLUNK 1. Broken or missing brake pad spring clips/shims. 1. Replace spring clips/shims. 2. Caliper guide pin bolts loose. 2. Tighten guide pin bolts. DISC BRAKE SQUEAK AT LOW SPEED (WHILE APPLYING LIGHT BRAKE PEDAL EFFORT) 1. Brake pad linings. 1. Replace brake pads. SCRAPING (METAL-TO-METAL). 1. Foreign object interference with brakes. 1. Inspect brakes and remove foreign object. 2. Brake pads worn out. 2. Replace brake pads. Inspect rotors. Reface or replace as necessary. SCRAPING OR WHIRRING 1. Wheel speed sensor hitting tone wheel. 1. Inspect, correct or replace faulty component(s). CONDITION POSSIBLE CAUSES CORRECTION BRAKES CHATTER 1. Disc brake rotor has 1. Isolate condition as rear or front. 2012 BRAKES Base - Service Information - Fiat 500 excessive thickness variation. Reface or replace brake rotors as necessary. BRAKES DRAG (FRONT OR ALL) 1. Contaminated brake fluid. 1. Check for swollen seals. Replace all system components containing rubber. 2. Binding caliper pins or bushings. 2. Replace pins and bushings 3. Misadjusted stop lamp switch. 3. Replace stop lamp switch. Refer to SWITCH, STOP LAMP, REMOVAL . 4. Master cylinder not fully returning. 4. Inspect master cylinder and replace as necessary. 5. Binding brake pedal. 5. Replace brake pedal/bushings. BRAKES DRAG (REAR ONLY) 1. Parking brake cables binding or froze up. 1. Check cable routing. Replace cables as necessary. 2. Parking brake cable return spring not returning shoes. 2. Replace cables as necessary. 3. Obstruction inside the center console preventing full return of the parking brake cables. 3. Remove console and remove obstruction. BRAKES GRAB 1. Contaminated brake linings. 1. Inspect and clean, or replace pads. Repair source of contamination. 2. Improper power brake booster assist. 2. Refer to BOOSTER, POWER BRAKE. EXCESSIVE PEDAL EFFORT 1. Obstruction of brake pedal. 1. Inspect, remove or move obstruction. 2. Low power brake booster assist. 2. Refer to BOOSTER, POWER BRAKE. 3. Glazed brake linings. 3. Reface or replace brake rotors as necessary. Replace brake pads. 4. Brake lining transfer to brake rotor. 4. Reface or replace brake rotors as necessary. Replace brake pads. EXCESSIVE PEDAL EFFORT (HARD PEDAL - CAN'T SKID WHEELS) 1. Power brake booster runout (vacuum assist). 1. Check booster vacuum hose and engine tune for adequate vacuum supply. Refer to BOOSTER, POWER BRAKE. EXCESSIVE PEDAL TRAVEL (VEHICLE STOPS OK) 1. Air in brake lines. 1. Bleed brakes. EXCESSIVE PEDAL TRAVEL (ONE FRONT WHEEL LOCKS UP DURING HARD BRAKING) 1. One of the two hydraulic circuits is malfunctioning. 1. Inspect system for leaks. Check master cylinder for internal malfunction. PEDAL PULSATES/SURGES DURING BRAKING 1. Disc brake rotor has excessive thickness variation. 1. Isolate condition as rear or front. Reface or replace brake rotors as necessary. 2012 BRAKES Base - Service Information - Fiat 500 STANDARD PROCEDURE STANDARD PROCEDURE - BASE BRAKE BLEEDING Do not pump the brake pedal at any time while having a bleeder screw open during the bleeding process. This will only increase the amount of air in the system and make additional bleeding necessary. PEDAL IS SPONGY 1. Air in brake lines. 1. Bleed brakes. PREMATURE REAR WHEEL LOCKUP 1. Contaminated brake linings. 1. Inspect and clean, or replace pads. Repair source of contamination. 2. EVBP not functioning. 2. Refer to the ABS service information and appropriate diagnostic information. STOP LAMPS STAY ON 1. Stop lamp switch out of adjustment. 1. Replace stop lamp switch. Refer to SWITCH, STOP LAMP, REMOVAL . 2. Brake pedal binding. 2. Inspect and replace as necessary. 3. Power brake booster not allowing pedal to return completely. 3. Replace power brake booster. VEHICLE PULLS TO RIGHT OR LEFT ON BRAKING 1. Frozen brake caliper piston. 1. Replace frozen piston or caliper. Bleed brakes. 2. Contaminated brake lining (most likely front lining). 2. Inspect and clean, or replace pads. Repair source of contamination. 3. Pinched brake lines. 3. Replace pinched line. 4. Leaking piston seal. 4. Replace piston seal or brake caliper. 5. Suspension problem. 5. Refer to FRONT SUSPENSION & WHEEL ALIGNMENT . PARKING BRAKE - EXCESSIVE HANDLE TRAVEL 1. Parking brake shoes out of adjustment. 1. Adjust parking brake shoes. NOTE: For bleeding the ABS hydraulic system, refer to STANDARD PROCEDURE - ANTILOCK BRAKE SYSTEM BLEEDING . CAUTION: Before removing the master cylinder cap, wipe it clean to prevent dirt and other foreign matter from dropping into the master cylinder reservoir. CAUTION: Use only Mopar® brake fluid or an equivalent from a fresh, tightly sealed container. Brake fluid must conform to DOT 3 specifications. NOTE: For bleeding of the Antilock Brake System, refer to STANDARD PROCEDURE - ANTILOCK BRAKE SYSTEM BLEEDING . . 2012 BRAKES Base - Service Information - Fiat 500 Do not allow the master cylinder reservoir to run out of brake fluid while bleeding the system. An empty reservoir will allow additional air into the brake system. Check the fluid level frequently and add fluid as needed. The following wheel circuit sequence for bleeding the brake hydraulic system should be used to ensure adequate removal of all trapped air from the hydraulic system.  Left rear wheel  Right front wheel  Right rear wheel  Left front wheel MANUAL BLEEDING Fig. 1: Bleeding Brakes Courtesy of CHRYSLER GROUP, LLC 1. Attach a clear plastic hose (1) to the bleeder screw and feed the hose into a clear jar (2) containing enough fresh brake fluid to submerge the end of the hose. 2. Have a helper pump the brake pedal three or four times and hold it in the down position. 3. With the pedal in the down position, open the bleeder screw at least one full turn. 4. Once the brake pedal has dropped, close the bleeder screw. After the bleeder screw is closed, release the brake pedal. 5. Repeat the above steps until all trapped air is removed from that wheel circuit (usually four or five times). NOTE: To bleed the brakes manually, the aid of a helper will be required. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 2: Master Cylinder Fill Markings Courtesy of CHRYSLER GROUP, LLC 6. Bleed the remaining wheel circuits in the same manner until all air is removed from the brake system. Monitor the fluid level in the master cylinder reservoir (2) to make sure it does not go dry. 7. Check and adjust brake fluid level to the FULL mark. 8. Check the brake pedal travel. If pedal travel is excessive or has not been improved, some air may still be trapped in the system. Re-bleed the brakes as necessary. 9. Test drive the vehicle to verify the brakes are operating properly and pedal feel is correct. PRESSURE BLEEDING NOTE: Follow pressure bleeder manufacturer's instructions for use of pressure bleeding equipment. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 3: Master Cylinder Cap, Bleeder Tank & Master Cylinder Reservoir Courtesy of CHRYSLER GROUP, LLC 1. Attach Master Cylinder Cap (special tool #6921, Cap, Master Cylinder) (2) in place of the filler cap on the master cylinder reservoir (3). 2. Attach Bleeder Tank C-3496-B (1) or an equivalent, to the Master Cylinder Cap (special tool #6921, Cap, Master Cylinder) (2). Fig. 4: Bleeding Brakes Courtesy of CHRYSLER GROUP, LLC 3. Attach a clear plastic hose (1) to the bleeder screw and feed the hose into a clear jar (2) containing enough fresh brake fluid to submerge the end of the hose. 4. Open the bleeder screw at least one full turn or more to obtain a steady stream of brake fluid. 5. After approximately 120-240 ml (4-8 ounces) of fluid have been bled through the brake circuit and an air- free flow is maintained in the clear plastic hose and jar, close the bleeder screw. 2012 BRAKES Base - Service Information - Fiat 500 6. Repeat this procedure at all the remaining bleeder screws. Fig. 5: Master Cylinder Fill Markings Courtesy of CHRYSLER GROUP, LLC 7. Check and adjust brake fluid level to the FULL mark on the reservoir (2). 8. Check the brake pedal travel. If pedal travel is excessive or has not been improved, some air may still be trapped in the system. Re-bleed the brakes as necessary. 9. Test drive the vehicle to verify the brakes are operating properly and pedal feel is correct. SPECIFICATIONS SPECIFICATIONS ACTUATION: Vacuum Operated Power Brakes Standard Hydraulic System Dual-Diagonally Split BRAKE PEDAL: Pedal Ratio 3.2:1 POWER BRAKE BOOSTER: Type Vacuum Assist Mounting Studs M8 x 1.25 Diaphragm Size/Type 228 mm /Single Diaphragm MASTER CYLINDER ASSEMBLY: Type Compact Body Material Anodized Aluminum Reservoir Material Polypropelene 2012 BRAKES Base - Service Information - Fiat 500 TORQUE SPECIFICATIONS SPECIAL TOOLS Bore and Stroke 22.2 mm x 36 mm (0.874 in. x 1.417 in.) Displacement Split 50 / 50 MASTER CYLINDER FLUID OUTLET PORTS: Tube Fitting Type ISO Flare Primary Tube Nut Thread M10 x 1 Secondary Tube Nut Thread M10 x 1 ABS HYDRAULIC CONTROL UNIT PORTS: Tube Fitting Type ISO Flare Inlet Port Threads (Both) M12 x 1 Outlet Port Threads-Left Front and Left Rear M10 x 1 Outlet Port Threads-Right Front and Right Rear M12 x 1 DESCRIPTION N.m Ft. Lbs. In. Lbs. ABS ICU Mounting Bolt (To Bracket) 11 - 97 ABS ICU Mounting Pins 11 - 97 ABS ICU Mounting Bracket Screws (To Frame) 23 17 203 ABS ABM Mounting Screws (To HCU) 2 - 17 ABS Dynamics Sensor Mounting Nuts 9 - 80 ABS Wheel Speed Sensor Head Mounting Screw - Front 7 - 62 ABS Wheel Speed Sensor Head Mounting Screw - Rear 7 - 62 ABS Wheel Speed Sensor Routing Bracket Mounting Screw 18 13 160 Brake Flex Hose Banjo Bolt - Front Caliper 24 18 210 Brake Flex Hose Fitting- Rear Caliper 16 12 142 Brake Pedal/Booster Mounting Nuts 23 17 200 Brake Tube Nuts 16 12 142 Disc Brake Caliper Adapter Bracket (To Knuckle) - Front 105 77 - Disc Brake Caliper Adapter Bracket (To Axle) - Rear 57 42 - Disc Brake Caliper Guide Pin Bolts - Front 28 21 - Disc Brake Caliper Guide Pin Bolts - Rear 34 25 - Disc Brake Caliper Bleeder Screw 8 - 71 Disc Brake Rotor Retaining Pins 12 - 106 Master Cylinder Mounting Nuts 25 18 - Parking Brake Lever Mounting Nuts 30 22 - Wheel Mounting (Lug) Bolts - Aluminum Wheels 100 75 - Wheel Mounting (Lug) Bolts - Steel Wheels 85 63 - 2012 BRAKES Base - Service Information - Fiat 500 SPECIAL TOOLS ELECTRICAL SWITCH, BRAKE FLUID LEVEL DESCRIPTION DESCRIPTION Fig. 6: Fluid Level Switch, Reservoir, Brake Tubes & Nuts Courtesy of CHRYSLER GROUP, LLC The brake fluid level switch (3) is mounted through the center of the master cylinder fluid reservoir (4). The switch can be serviced separately from the reservoir. 25-W - Roller Contact Point 6921 - Cap, Master Cylinder (Originally Shipped In Kit Number(s) 6907.) 8358-1 - Bleed Tube (Originally Shipped In Kit Number(s) 8646, 8647, 8648.) 8807 - Retractor, Rear Caliper Piston (Originally Shipped In Kit Number(s) 10105, 8632.) 8807-1 - Assembly, Forcing Screw (Originally Shipped In Kit Number(s) 10105, 8632.) 8807-2 - Adapter (Originally Shipped In Kit Number(s) 10105, 8632.) 8822-2 - Adapter, M12 X 1.0 (Originally Shipped In Kit Number(s) 9974.) C-3339A - Set, Dial Indicator (Originally Shipped In Kit Number(s) 9202.) 2012 BRAKES Base - Service Information - Fiat 500 REMOVAL REMOVAL Fig. 7: Fluid Level Switch, Reservoir, Brake Tubes & Nuts Courtesy of CHRYSLER GROUP, LLC 1. Remove the wiring harness connector (3) from the brake fluid level switch in the master cylinder brake fluid reservoir. 2. Depress the tab on the underside of the reservoir and remove the brake fluid switch from the reservoir. INSTALLATION INSTALLATION NOTE: Before proceeding, refer to CAUTION and WARNING. . 2012 BRAKES Base - Service Information - Fiat 500 Fig. 8: Fluid Level Switch, Reservoir, Brake Tubes & Nuts Courtesy of CHRYSLER GROUP, LLC 1. Insert brake fluid switch into reservoir until it is firmly in place. 2. Connect the wiring harness connector (3) to the switch. HYDRAULIC/MECHANICAL DESCRIPTION DESCRIPTION All vehicles are equipped with both front and rear disc brake assemblies. Each disc brake assembly consists of the following major components:  Caliper  Caliper adapter bracket  Pads  Rotor All calipers are the low-drag type. New technology caliper construction allows minimal drag of the pads on the discs with low clearance to the rotors to maintain maximum pedal feel and responsiveness. All calipers are coated, giving them a bright appearance. This coating offers corrosion protection and a long- term neat appearance. Steel pistons are used in all calipers. Front disc brakes are equipped with an audible wear indicator on the right side inboard brake pad only. The left side pads do not include an audible wear indicator. Rear disc brakes are equipped with audible wear indicators on both left side and right side inboard brake pads. 2012 BRAKES Base - Service Information - Fiat 500 When the brake pads are replaced, only brake pads meeting the Original Equipment Manufacturer (OEM) formulation (such as Mopar® replacement parts) should be used. All brake rotors are fully coated with zinc dust, water-soluble, environmentally friendly corrosion preventive. Both the friction surfaces and the vents are coated. During initial brake applications of a new rotor, the brake pads scrub the coating off the friction surfaces, ensuring that the remainder will be rust free. Coating the vents also ensures that there will not be a loss of heat capacity over time. BOOSTER, POWER BRAKE DESCRIPTION DESCRIPTION Fig. 9: Power Brake Booster, Master Cylinder & Push Rod Courtesy of CHRYSLER GROUP, LLC The power brake booster (2) is mounted to the engine side of the dash panel. The master cylinder is bolted to the front of the booster. A vacuum check valve is also mounted on the front of the booster. A vacuum line connects the check valve to engine source vacuum. The booster input rod extends through the dash panel and connects to the brake pedal. The power brake booster can be identified by the tag attached to the body of the booster. This tag contains the following information:  The production part number  The date it was built, and  The booster manufacturer. DIAGNOSIS AND TESTING DIAGNOSIS AND TESTING - MASTER CYLINDER/POWER BOOSTER 2012 BRAKES Base - Service Information - Fiat 500 1. Start the engine and check the booster vacuum hose connections. A hissing noise indicates a vacuum leak. Correct any vacuum leaks before proceeding. 2. Stop the engine and pump the brake pedal until all vacuum reserve in the booster is depleted. 3. Press and hold the brake pedal under light foot pressure. The pedal should hold firm. If the pedal falls away, there may be an external leak or the master cylinder is faulty (internal leakage). 4. Start the engine and note pedal action. It should fall away slightly under light foot pressure, then hold firm. If no pedal action is discernible, the power booster, vacuum supply or vacuum check valve is faulty. Refer to POWER BOOSTER VACUUM TEST. 5. If the POWER BOOSTER VACUUM TEST passes, rebuild the booster vacuum reserve as follows: Release the brake pedal. Increase engine speed to 1500 RPM, close the throttle and immediately turn off the ignition to stop the engine. 6. Wait a minimum of 90 seconds and try brake action again. The booster should provide two or more vacuum assisted pedal applications. If the vacuum assist is not provided, the booster is faulty. POWER BOOSTER VACUUM TEST 1. Connect a vacuum gauge to the booster check valve with a short length of hose and T-fitting. 2. Start and run the engine at curb idle for one minute. 3. Observe the vacuum supply. If the vacuum supply is less that 12 inches HG (406 millibars), repair the vacuum supply. 4. Clamp the hose shut between the intake vacuum source and the check valve. 5. Stop the engine and observe the vacuum gauge. 6. If the vacuum drops more than one inch HG (33 millibars) within 15 seconds, the booster diaphragm or check valve is faulty. POWER BOOSTER CHECK VALVE TEST 1. Remove the power booster check valve from the power booster. 2. Using a hand operated vacuum pump, apply 15-20 inches HG (508-677 millibars) vacuum at the booster side of the check valve. 3. The vacuum should hold steady. If the gauge on the pump indicates vacuum loss, the check valve is faulty and should be replaced. REMOVAL REMOVAL 2012 BRAKES Base - Service Information - Fiat 500 Fig. 10: Engine Cover Courtesy of CHRYSLER GROUP, LLC 1. With the engine not running, pump the brake pedal 4-5 strokes until the pedal feel is firm. 2. Remove the engine cover (1). CAUTION: The vacuum in the power brake booster must be pumped down before removing the master cylinder to prevent the booster from sucking in any contamination. This can be done by pumping the brake pedal while the engine is not running until a firm brake pedal is achieved. NOTE: Before proceeding, refer to CAUTION and WARNING. . 2012 BRAKES Base - Service Information - Fiat 500 Fig. 11: Air Cleaner Body Assembly Courtesy of CHRYSLER GROUP, LLC 3. Disconnect and isolate the battery negative cable from its post on the battery. 4. Remove the air cleaner body (5). Refer to BODY, AIR CLEANER, REMOVAL or BODY, AIR CLEANER, REMOVAL or BODY, AIR CLEANER, REMOVAL . Fig. 12: PCM Electrical Connectors Courtesy of CHRYSLER GROUP, LLC 5. Disconnect and remove the battery. Refer to REMOVAL . 6. Disconnect the powertrain control module (PCM) electrical connectors (1 and 2). Fig. 13: Battery Tray, Connectors, Retainers, Nut & Bolts Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Base - Service Information - Fiat 500 7. Disengage two starter wire harness retainers (6) from the battery tray (3). 8. Disengage two engine wire harness retainers (4) from the battery tray (3). 9. Disengage the engine wire harness connector (2) from the battery tray (3) and reposition the wire harness. 10. Remove the nut (5) and two bolts (1). Fig. 14: PCM, Retainers, Ground Strap & Nuts Courtesy of CHRYSLER GROUP, LLC 11. Open the two wire harness retainers (3) and reposition the wire harness. 12. Remove the battery tray with the PCM (2) attached. Fig. 15: Antilock Brake Module (ABM) & Connector Cover Courtesy of CHRYSLER GROUP, LLC 13. Disconnect the Antilock Brake Module (ABM) harness connector (2) from the ABM (1). To do so: 2012 BRAKES Base - Service Information - Fiat 500 1. Lift the connector cover (2) until it locks into position straight up and down. 2. The connector can then be pulled straight up and off the ABM (1). Fig. 16: Integrated Control Unit (ICU) Assembly Courtesy of CHRYSLER GROUP, LLC 14. Siphon as much fluid as possible from master cylinder reservoir. 15. Remove brake tubes from Integrated Control Unit (ICU) (3), including two fittings (4) from the master cylinder. 16. Remove the two mounting screws (5) attaching the ICU (3) mounting bracket to the body. 17. Pull the ICU (3) away from the body to separate mounting pin from body hole (1). 18. Move the brake tubes around as necessary without bending them and remove the ICU with bracket from the vehicle. Fig. 17: Fluid Level Switch, Reservoir, Brake Tubes & Nuts 2012 BRAKES Base - Service Information - Fiat 500 Courtesy of CHRYSLER GROUP, LLC 19. Disconnect the vacuum hose from the check valve on the power brake booster. 20. Remove brake fluid switch (3) from master cylinder reservoir (4). 21. Remove master cylinder retaining nuts (2) and remove master cylinder from vehicle. Fig. 18: Lower Coupling Bolt Courtesy of CHRYSLER GROUP, LLC 22. Remove intermediate shaft pinch bolt (3) and separate intermediate shaft (2) from steering gear pinion shaft (4). Fig. 19: Brake Pedal Sled & Nuts Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Base - Service Information - Fiat 500 23. Press the tabs together and separate the booster push rod from the pedal assembly. 24. Remove the four nuts (3) attaching the power brake booster to the dash panel. Fig. 20: Power Brake Booster, Master Cylinder & Push Rod Courtesy of CHRYSLER GROUP, LLC 25. Slide the power brake booster (2) forward until its mounting studs clear the dash panel, then remove it through the engine compartment. INSTALLATION INSTALLATION Fig. 21: Booster Seal Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Base - Service Information - Fiat 500 Fig. 22: Power Brake Booster, Master Cylinder & Push Rod Courtesy of CHRYSLER GROUP, LLC 1. Install the power brake booster (2) by sliding the push rod (3) and studs through the dash panel and into mounting position. Fig. 23: Brake Pedal Sled & Nuts Courtesy of CHRYSLER GROUP, LLC 2. Under the instrument panel, install the four power brake booster mounting nuts (3). 3. Tighten the brake pedal/booster mounting nuts to 23 N.m (17 ft. lbs.). 4. Install the power brake booster push rod into the back of the brake pedal until it is snapped into the tabs. NOTE: Before power brake booster (1) installation, be certain a NEW dash seal (2) is installed on the booster mounting studs. 2012 BRAKES Base - Service Information - Fiat 500 5. Install and adjust the stop lamp switch in the brake pedal bracket. Refer to SWITCH, STOP LAMP, INSTALLATION . Fig. 24: Lower Coupling Bolt Courtesy of CHRYSLER GROUP, LLC 6. Install intermediate shaft (2) to steering gear pinion shaft and install a NEW pinch bolt (3). Tighten pinch bolt to 55 N.m (40 ft. lbs.). Fig. 25: Seal On Rear Of Master Cylinder Courtesy of CHRYSLER GROUP, LLC NOTE: The master cylinder must be bled before installing it on the vehicle. 2012 BRAKES Base - Service Information - Fiat 500 7. Bench bleed the master cylinder. Refer to MASTER CYLINDER, BRAKE, STANDARD PROCEDURE. 8. Wipe the face of the power brake booster clean where the vacuum seal on the rear of the master cylinder comes in contact when it's installed. Do not get any cleaner or debris inside the booster. 9. If the master cylinder does not have a new vacuum seal (2) on the mounting flange (1), remove it. Install a NEW vacuum seal on the master cylinder mounting flange making sure the seal fits squarely in its groove. Fig. 26: Fluid Level Switch, Reservoir, Brake Tubes & Nuts Courtesy of CHRYSLER GROUP, LLC 10. Line up the master cylinder mounting holes with the mounting studs on the power brake booster. Ensure the master cylinder piston push rod lines up with the booster push rod, then carefully slide the master cylinder into the power brake booster until it contacts the face of the booster. 11. Install two NEW master cylinder mounting nuts (2). Tighten each nut to 25 N.m (18 ft. lbs.). 12. Connect the primary and secondary brake tubes (1) to the master cylinder outlet ports. Tighten the tube nuts to 17 N.m (150 in. lbs.). 13. Connect the wiring harness connector (3) to the brake fluid level switch. CAUTION: When installing a master cylinder on the vehicle, a NEW vacuum seal (2) MUST be installed on the master cylinder mounting flange (1). CAUTION: If resistance is met during master cylinder insertion into power brake booster, the master cylinder push rod may not be lined up with the booster push rod. Remove the master cylinder, realign and insert it again. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 27: Clutch Actuator Port Plug Courtesy of CHRYSLER GROUP, LLC 14. If equipped with a manual transaxle and a new reservoir is being installed, remove the plug (1) for the clutch actuator port. 15. If equipped with a manual transaxle, slide the clutch actuator hose onto the reservoir port. Install the hose clamp just past the upset bead on the port. Fig. 28: Integrated Control Unit (ICU) Assembly Courtesy of CHRYSLER GROUP, LLC 16. Position the Integrated Control Unit (ICU) (3) and insert mounting pin into body hole (1). 17. Install mounting bolts (5) and tighten to 23 N.m (17 ft. lbs.). 18. Install brake tubes (4) and connect to master cylinder. Tighten tube nuts to 17 N.m (150 in. lbs.). 19. Connect the vacuum hose to the check valve on the brake booster. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 29: Antilock Brake Module (ABM) & Connector Cover Courtesy of CHRYSLER GROUP, LLC 20. Insert the ABM wiring harness connector (2) into the socket of the ABM (1) and close the cover, locking the connector in place. Fig. 30: PCM, Retainers, Ground Strap & Nuts Courtesy of CHRYSLER GROUP, LLC 21. Position the battery tray and PCM in the vehicle. Route the wire harness and close the wire harness retainers (3). CAUTION: Before installing the ABM harness connector on the ABM, be sure the seal is properly installed in the connector. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 31: Battery Tray, Connectors, Retainers, Nut & Bolts Courtesy of CHRYSLER GROUP, LLC 22. Install the battery tray (3) with one nut (5) and two bolts (1) tightened to 25 N.m (18 ft. lbs.). 23. Engage the engine wire harness connector (2) to the battery tray (3). 24. Engage two engine wire harness retainers (4) to the battery tray (3). 25. Engage two starter wire harness retainers (6) to the battery tray (3). Fig. 32: PCM Electrical Connectors Courtesy of CHRYSLER GROUP, LLC 26. Connect the powertrain control module (PCM) electrical connectors (1 and 2). 2012 BRAKES Base - Service Information - Fiat 500 Fig. 33: Air Cleaner Body Assembly Courtesy of CHRYSLER GROUP, LLC 27. Install the air cleaner body (4). Refer to BODY, AIR CLEANER, INSTALLATION or BODY, AIR CLEANER, INSTALLATION or BODY, AIR CLEANER, INSTALLATION . Fig. 34: Engine Cover Courtesy of CHRYSLER GROUP, LLC 28. Connect the negative (ground) cable on the battery. 29. Fill the master cylinder reservoir to the proper level. 30. Install the engine cover (1). WARNING: Be certain a firm brake pedal is achieved prior to attempting to operate the vehicle. If a firm brake pedal cannot be achieved, bleed the brake hydraulic system and check for leaks. Refer to STANDARD 2012 BRAKES Base - Service Information - Fiat 500 31. Install a scan tool to initialize the ABM and perform the following: 1. Clear any faults. 2. Fill the master cylinder to the proper fill level and bleed the base and ABS hydraulic systems. Refer to STANDARD PROCEDURE. . 3. Check for leaks. 4. Perform the ABS Verification Test. Refer to ABS VERIFICATION TEST . 32. Road test the vehicle to ensure proper operation of the brakes. CALIPER, DISC BRAKE, FRONT REMOVAL REMOVAL Fig. 35: Brake Pedal Holding Tool Courtesy of CHRYSLER GROUP, LLC 1. Using a brake pedal holding tool as shown in illustration, depress the brake pedal past its first 25 mm (1 inch) of travel and hold it in this position. This will isolate the master cylinder from the brake hydraulic system and will not allow the brake fluid to drain out of the master cylinder reservoir when the lines are opened. PROCEDURE. . NOTE: Before proceeding, refer to CAUTION and WARNING. . 2012 BRAKES Base - Service Information - Fiat 500 Fig. 36: Wheel Lug Bolts Courtesy of CHRYSLER GROUP, LLC 2. Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE . 3. Remove the wheel mounting bolts (1), then the tire and wheel assembly. Fig. 37: Left Vertical Brace Bolts, Brake Hose Connector, Brake Hose & Banjo Bolt Courtesy of CHRYSLER GROUP, LLC 4. Remove the banjo bolt (4) connecting the brake flex hose to the brake line connector. 5. Remove the clip and remove the brake hose (3) from the strut. 6. Remove brake hose connector (2) from brake caliper. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 38: Brake Caliper, Mounting Bolts & Guide Pin Bolts Courtesy of CHRYSLER GROUP, LLC 7. Remove the two brake caliper guide pin bolts (2). 8. Slide the disc brake caliper (3) from the disc brake adapter bracket and remove. DISASSEMBLY DISASSEMBLY 1. Mount the caliper in a vise equipped with protective jaws. NOTE: Before disassembling the brake caliper, remove it from the vehicle. Refer to CALIPER, DISC BRAKE, FRONT, REMOVAL. NOTE: Before disassembling the brake caliper, clean and inspect it. Refer to CALIPER, DISC BRAKE, FRONT, INSPECTION and CALIPER, DISC BRAKE, FRONT, CLEANING. WARNING: Under no condition should high pressure air ever be used to remove a piston from a caliper bore. Personal injury could result from such a practice. CAUTION: Do not use excessive force when clamping caliper in vise. Excessive vise pressure will cause bore distortion. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 39: Piston Removal Courtesy of CHRYSLER GROUP, LLC 2. Place a wooden block (1) in the caliper as shown in illustration. 3. If necessary, apply low pressure compressed air to the caliper fluid inlet in short spurts to force the piston out. 4. Remove the piston from the caliper. 5. Remove the dust boot from the piston and discard it. Fig. 40: Piston Seal Removal 1 - WOOD BLOCK WARNING: Do not place face or hands near caliper and piston if using compressed air pressure to remove piston. Do not use high pressure. 2012 BRAKES Base - Service Information - Fiat 500 Courtesy of CHRYSLER GROUP, LLC 6. Using a soft tool such as a plastic trim stick (1), work the piston seal (2) out of its groove in caliper piston bore. Discard the used seal. 7. Clean the piston bore and drilled passage ways with alcohol or a suitable solvent. Wipe it dry using only a lint-free cloth. 8. Inspect both the piston and bore for scoring or pitting. Bores that show light scratches or corrosion can usually be cleared of the light scratches or corrosion using crocus cloth. CLEANING CLEANING To clean or flush the internal passages of the brake caliper, use fresh brake fluid or Mopar® Non-Chlorinated Brake Parts Cleaner. Never use gasoline, kerosene, alcohol, oil, transmission fluid or any fluid containing mineral oil to clean the caliper. These fluids will damage rubber cups and seals. INSPECTION INSPECTION Inspect the disc brake caliper for the following:  Brake fluid leaks in and around piston boot area  Ruptures, brittleness or damage to the piston dust boot If caliper fails inspection, disassemble and recondition caliper, replacing the seals and dust boots. ASSEMBLY 1 - TRIM STICK 2 - SEAL CAUTION: Do not use a screw driver or other metal tool for seal removal. Using such tools can scratch the bore or leave burrs on the seal groove edges. WARNING: Chrysler LLC does not manufacture any vehicles or replacement parts that contain asbestos. Aftermarket products may or may not contain asbestos. Refer to aftermarket product packaging for product information. Whether the product contains asbestos or not, dust and dirt can accumulate on brake parts during normal use. Follow practices prescribed by appropriate regulations for the handling, processing and disposing of dust and debris. 2012 BRAKES Base - Service Information - Fiat 500 ASSEMBLY Fig. 41: Installing Caliper Piston Seal Courtesy of CHRYSLER GROUP, LLC 1. Dip the NEW piston seal in clean brake fluid and install it in the groove (2) of the caliper bore. The seal (1) should be started at one area of the groove and gently worked around into the groove using only your clean fingers to seat it. Fig. 42: Boot Installation Courtesy of CHRYSLER GROUP, LLC NOTE: Always have clean hands when assembling a brake caliper. NOTE: Always use fresh, clean brake fluid when assembling a brake caliper. 1 - SEAL 2 - GROOVE NOTE: Never use an old piston seal. 2012 BRAKES Base - Service Information - Fiat 500 2. Coat the NEW piston with clean brake fluid. 3. Coat the NEW piston boot with clean brake fluid leaving a generous amount inside the boot. 4. Position the dust boot over the lower section of the piston. 5. Extend the dust boot below the bottom of the piston and guide the lip seal into the groove in the caliper piston bore. Fig. 43: Piston Installation Courtesy of CHRYSLER GROUP, LLC 6. Install the piston (1) into the bore, carefully pushing it past the piston seal using hand pressure . Push the piston in until it bottoms in the caliper bore and the dust boot lip seal falls into the groove near the top of the piston. 7. Install the caliper on the vehicle and bleed the brakes as necessary. Refer to CALIPER, DISC BRAKE, FRONT, INSTALLATION. INSTALLATION INSTALLATION 1 - PISTON GROOVE CAUTION: Force applied to the piston (1) to seat it in the bore must be applied uniformly to avoid cocking and binding of the piston. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 44: Brake Caliper, Mounting Bolts & Guide Pin Bolts Courtesy of CHRYSLER GROUP, LLC 1. Completely retract the caliper piston back into the bore of the caliper. Use a C-clamp to retract the piston. Place a wood block over the piston before installing the C-clamp to avoid damaging the piston. 2. Install the disc brake caliper over the brake pads on the brake caliper adapter bracket. 3. Align the caliper guide pin bolt holes with the adapter bracket. Install the caliper guide pin bolts (2) and tighten to 28 N.m (21 ft. lbs.). Fig. 45: Left Vertical Brace Bolts, Brake Hose Connector, Brake Hose & Banjo Bolt Courtesy of CHRYSLER GROUP, LLC CAUTION: Use care when installing the caliper onto the adapter bracket to avoid damaging the guide pin boots. 2012 BRAKES Base - Service Information - Fiat 500 4. Install the brake hose connector (2) to the brake caliper and tighten to 24 N.m (18 ft. lbs.). 5. Install brake hose fitting to brake line connector (4) and tighten to 24 N.m (18 ft. lbs.). 6. Install brake hose to mounting location on strut (3) and secure with the clip. Fig. 46: Wheel Lug Bolts Courtesy of CHRYSLER GROUP, LLC 7. Install the tire and wheel assembly. Refer to INSTALLATION . 8. Lower the vehicle. Fig. 47: Brake Pedal Holding Tool Courtesy of CHRYSLER GROUP, LLC 9. Remove the brake pedal holding tool. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 48: Bleeding Brakes Courtesy of CHRYSLER GROUP, LLC 10. Bleed the caliper as necessary. Refer to STANDARD PROCEDURE. . 11. Road test the vehicle and make several stops to wear off any foreign material on the brakes and to seat the brake shoes. CALIPER, DISC BRAKE, REAR REMOVAL REMOVAL Fig. 49: Brake Pedal Holding Tool Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Base - Service Information - Fiat 500 1. Using a brake pedal holding tool as shown in illustration, depress the brake pedal past its first one inch of travel and hold it in this position. This will isolate the master cylinder from the brake hydraulic system and will not allow the brake fluid to drain out of the master cylinder reservoir while the lines are disconnected. 2. Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE . Fig. 50: Wheel Lug Bolts Courtesy of CHRYSLER GROUP, LLC 3. Remove the wheel cover with a soft prying tool. 4. Remove the wheel mounting bolts (1), then the rear tire and wheel assembly. NOTE: Before proceeding, refer to CAUTION and WARNING. . 2012 BRAKES Base - Service Information - Fiat 500 Fig. 51: Parking Brake Cable, Flex Hose & Guide Pin Bolts Courtesy of CHRYSLER GROUP, LLC 5. Disengage parking brake cable (2) from actuator arm and remove from brake caliper. 6. Unthread and remove the brake flex hose (3) from the brake caliper. 7. While holding guide pins from turning, remove caliper guide pin bolts (1). 8. Slide and remove the disc brake caliper with outboard brake pad attached from the disc brake adapter bracket, inboard brake pad and rotor. 9. Remove the outboard brake pad from the caliper by prying the brake pad retaining clip over the raised area on the caliper. Slide the brake pad off of the brake caliper. INSTALLATION INSTALLATION Fig. 52: Seating Piston With Special Tool Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Base - Service Information - Fiat 500 1. Seat (bottom) the caliper piston in the bore as follows: 1. Assemble a 3/8 in. drive ratchet handle and an extension (3). 2. Insert the extension through Special Tool (special tool #8807-1, Assembly, Forcing Screw) (2). 3. Place Special Tool (special tool #8807-2, Adapter) (1) on the end of the extension. 4. Insert lugs on Special Tool (special tool #8807-2, Adapter) into notches in face of caliper piston (5). 5. Thread the screw drive on (special tool #8807-1, Assembly, Forcing Screw) down until it contacts the top of (special tool #8807-2, Adapter) which is against the caliper piston. Do not over tighten the screw-drive. Damage to the piston can occur. 6. Turn (special tool #8807-2, Adapter) with the ratchet, rotating the piston in a clockwise direction until fully seated (bottomed) in the bore. It may be necessary to turn (special tool #8807-1, Assembly, Forcing Screw) with (special tool #8807-2, Adapter) to start the process of piston retraction. Fig. 53: Parking Brake Cable, Flex Hose & Guide Pin Bolts Courtesy of CHRYSLER GROUP, LLC 2. Slide the outboard brake pad onto the caliper. Be sure the retaining clip is squarely seated in the depressed areas on the caliper beyond the raised retaining bead. 3. Install the disc brake caliper with outboard brake pad attached over the inboard brake pad and rotor, onto the brake caliper adapter bracket. NOTE: There is a small post on the lower backside of the inboard pad. Make sure that this post lines up with one of the slots on the piston to ensure the pad interfaces with the piston correctly. CAUTION: Use care when installing the caliper onto the disc brake adapter to avoid damaging the guide pin boots. 2012 BRAKES Base - Service Information - Fiat 500 4. Align the caliper guide pin bolt holes with the adapter bracket. Install the caliper guide pin bolts (1) and tighten the guide pin bolts to 34 N.m (25 ft. lbs.). 5. Install brake line fitting (3) and tighten to 17 N.m (150 in. lbs.). 6. Insert parking brake cable through mounting hole in caliper and attach cable end (3) to parking brake actuator arm. Fig. 54: Wheel Lug Bolts Courtesy of CHRYSLER GROUP, LLC 7. Install the tire and wheel assembly. Refer to INSTALLATION . 8. Install wheel cover, if equipped. 9. Lower the vehicle. Fig. 55: Brake Pedal Holding Tool 2012 BRAKES Base - Service Information - Fiat 500 Courtesy of CHRYSLER GROUP, LLC 10. Remove the brake pedal holding tool. Fig. 56: Bleeding Brakes Courtesy of CHRYSLER GROUP, LLC 11. Bleed the caliper as necessary. Refer to STANDARD PROCEDURE. . 12. Road test the vehicle and make several stops to wear off any foreign material on the brakes and to seat the brake shoes. FLUID DIAGNOSIS AND TESTING DIAGNOSIS AND TESTING - BRAKE FLUID CONTAMINATION Indications of fluid contamination are swollen or deteriorated rubber parts. Swelling indicates the presence of petroleum in the brake fluid. To test for contamination, put a small amount of drained brake fluid in clear glass jar. If the fluid separates into layers, there is mineral oil or other fluid contamination of the brake fluid. If the brake fluid is contaminated, drain and thoroughly flush the brake system. Replace all the rubber parts or components containing rubber coming into contact with the brake fluid including: the master cylinder and reservoir; proportioning valves (non-ABS); caliper seals; wheel cylinder seals; ABS hydraulic control unit; and all hydraulic fluid hoses. SPECIFICATIONS SPECIFICATIONS The brake fluid used in this vehicle must conform to DOT 3 specifications and SAE J1703 standards. No other type of brake fluid is recommended or approved for usage in the vehicle brake system. Use only Mopar® Brake 2012 BRAKES Base - Service Information - Fiat 500 Fluid DOT 3 Motor Vehicle or equivalent from a tightly sealed container. MASTER CYLINDER, BRAKE DESCRIPTION DESCRIPTION All master cylinders are a two-outlet design and the brake tubes from these primary and secondary outlet ports lead directly to the Integrated Control Unit (ICU) before going to each wheel brake. The master cylinder body is an anodized aluminum casting. It has a machined bore to accept the master cylinder pistons and also has threaded ports with seats for hydraulic brake tube connections. The master cylinder has the brake fluid reservoir mounted on top of it which gravity feeds brake fluid to the master cylinder when it is required. On manual transmission model vehicles the brake fluid reservoir also feeds the clutch hydraulic circuit. The reservoir is made of see-through plastic and it houses the brake fluid level switch. OPERATION OPERATION When the brake pedal is pressed, the master cylinder primary and secondary pistons apply brake pressure through the ABS Integrated Control Unit (ICU) and chassis brake tubes to each brake assembly. The brake fluid reservoir supplies the brake hydraulic system with the necessary fluid to operate properly. ABS (ESC) equipped master cylinder outlet ports supply hydraulic pressure to the ABS ICU where it is distributed to the individual wheel brakes. The master cylinder reservoir cap diaphragm is slit to allow atmospheric pressure to equalize on both sides of the diaphragm. DIAGNOSIS AND TESTING DIAGNOSIS AND TESTING - MASTER CYLINDER/POWER BOOSTER 1. Start the engine and check the booster vacuum hose connections. A hissing noise indicates a vacuum leak. CAUTION: Never use reclaimed brake fluid or fluid from a container which has been left open. An open container will absorb moisture from the air and contaminate the fluid. CAUTION: Never use any type of a petroleum-based fluid in the brake hydraulic system. Use of such type fluids will result in seal damage of the vehicle brake hydraulic system causing a failure of the vehicle brake system. Petroleum based fluids would be items such as engine oil, transmission fluid, power steering fluid, etc. 2012 BRAKES Base - Service Information - Fiat 500 Correct any vacuum leaks before proceeding. 2. Stop the engine and pump the brake pedal until all vacuum reserve in the booster is depleted. 3. Press and hold the brake pedal under light foot pressure. The pedal should hold firm. If the pedal falls away, there may be an external leak or the master cylinder is faulty (internal leakage). 4. Start the engine and note pedal action. It should fall away slightly under light foot pressure, then hold firm. If no pedal action is discernible, the power booster, vacuum supply or vacuum check valve is faulty. Refer to POWER BOOSTER VACUUM TEST. 5. If the POWER BOOSTER VACUUM TEST passes, rebuild the booster vacuum reserve as follows: Release the brake pedal. Increase engine speed to 1500 RPM, close the throttle and immediately turn off the ignition to stop the engine. 6. Wait a minimum of 90 seconds and try brake action again. The booster should provide two or more vacuum assisted pedal applications. If the vacuum assist is not provided, the booster is faulty. POWER BOOSTER VACUUM TEST 1. Connect a vacuum gauge to the booster check valve with a short length of hose and T-fitting. 2. Start and run the engine at curb idle for one minute. 3. Observe the vacuum supply. If the vacuum supply is less that 12 inches HG (406 millibars), repair the vacuum supply. 4. Clamp the hose shut between the intake vacuum source and the check valve. 5. Stop the engine and observe the vacuum gauge. 6. If the vacuum drops more than one inch HG (33 millibars) within 15 seconds, the booster diaphragm or check valve is faulty. POWER BOOSTER CHECK VALVE TEST 1. Remove the power booster check valve from the power booster. 2. Using a hand operated vacuum pump, apply 15-20 inches HG (508-677 millibars) vacuum at the booster side of the check valve. 3. The vacuum should hold steady. If the gauge on the pump indicates vacuum loss, the check valve is faulty and should be replaced. STANDARD PROCEDURE STANDARD PROCEDURE - MASTER CYLINDER BLEEDING 1. Clamp the master cylinder in a vise with soft-jaw caps. NOTE: On vehicles without ABS this procedure is designed to be performed with the proportioning valves installed in the master cylinder. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 57: Bleeding Master Cylinder Courtesy of CHRYSLER GROUP, LLC 2. Attach the special tools for bleeding the master cylinder in the following fashion: 1. Thread Bleeder Tube Adapters (3), Special Tool (special tool #8822-2, Adapter, M12 X 1.0), into the primary and secondary outlet ports of the master cylinder. Tighten Adapters to 17 N.m (150 in. lbs.). 2. Thread a Bleeder Tube (2), Special Tool (special tool #8358-1, Bleed Tube), into each Adapter. Tighten tube nuts to 17 N.m (150 in. lbs.). 3. Flex each Bleeder Tube and place the open ends into the neck of the master cylinder reservoir. Position the open ends of the tubes into the reservoir so their outlets are below the surface of the brake fluid in the reservoir when filled. 3. Fill the brake fluid reservoir with fresh Mopar® Brake Fluid DOT 3 Motor Vehicle, or equivalent. Refer to FLUID, SPECIFICATIONS. 4. Using an appropriately sized wooden dowel as a pushrod, slowly press the pistons inward discharging brake fluid through the Bleeder Tubes, then release the pressure, allowing the pistons to return to the released position. Repeat this several times until all air bubbles are expelled from the master cylinder bore and Bleeder Tubes. 5. Remove the Bleeder Tubes and Adapters from the master cylinder and plug the master cylinder outlet ports. 6. Install the fill cap on the reservoir. 7. Remove the master cylinder from the vise. 8. Install the master cylinder on the vehicle. Refer to MASTER CYLINDER, BRAKE, INSTALLATION. NOTE: Make sure the ends of the Bleeder Tubes stay below the surface of the brake fluid in the reservoir at all times during the bleeding procedure. 2012 BRAKES Base - Service Information - Fiat 500 REMOVAL REMOVAL Fig. 58: Engine Cover Courtesy of CHRYSLER GROUP, LLC 1. With the engine not running, pump the brake pedal 4-5 strokes until the pedal feel is firm. 2. Remove the engine cover (1). CAUTION: The vacuum in the power brake booster must be pumped down before removing the master cylinder to prevent the booster from sucking in any contamination. This can be done by pumping the brake pedal while the engine is not running until a firm brake pedal is achieved. NOTE: Before proceeding, refer to CAUTION and WARNING. . 2012 BRAKES Base - Service Information - Fiat 500 Fig. 59: Air Cleaner Body Assembly Courtesy of CHRYSLER GROUP, LLC 3. Disconnect and isolate the battery negative cable from its post on the battery. 4. Remove the air cleaner body (5). Refer to BODY, AIR CLEANER, REMOVAL or BODY, AIR CLEANER, REMOVAL or BODY, AIR CLEANER, REMOVAL . Fig. 60: PCM Electrical Connectors Courtesy of CHRYSLER GROUP, LLC 5. Disconnect and remove the battery. Refer to BATTERY, REMOVAL . 6. Disconnect the powertrain control module (PCM) electrical connectors (1 and 2). 2012 BRAKES Base - Service Information - Fiat 500 Fig. 61: Battery Tray, Connectors, Retainers, Nut & Bolts Courtesy of CHRYSLER GROUP, LLC 7. Disengage two starter wire harness retainers (6) from the battery tray (3). 8. Disengage two engine wire harness retainers (4) from the battery tray (3). 9. Disengage the engine wire harness connector (2) from the battery tray (3) and reposition the wire harness. 10. Remove the nut (5) and two bolts (1). Fig. 62: PCM, Retainers, Ground Strap & Nuts Courtesy of CHRYSLER GROUP, LLC 11. Open the two wire harness retainers (3) and reposition the wire harness. 12. Remove the battery tray with the PCM (2) attached. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 63: Fluid Level Switch, Reservoir, Brake Tubes & Nuts Courtesy of CHRYSLER GROUP, LLC 13. Siphon as much fluid as possible from master cylinder reservoir. 14. Remove brake tubes (1) from Integrated Control Unit (ICU), including two fittings from the master cylinder. 15. Disconnect the vacuum hose from the check valve on the power brake booster. 16. Remove brake fluid switch (3) from master cylinder reservoir (4). 17. Remove master cylinder retaining nuts (2) and remove master cylinder from vehicle. DISASSEMBLY DISASSEMBLY Fig. 64: Fluid Level Switch, Reservoir & Pin Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Base - Service Information - Fiat 500 1. Clean the master cylinder housing and brake fluid reservoir. Use only Mopar® Brake Parts Cleaner or equivalent. 2. Remove the brake fluid reservoir cap. Using a syringe or equivalent type tool, empty as much brake fluid as possible from the reservoir. 3. Remove the brake fluid level switch (2) from the reservoir (1). 4. Remove the pin (3) fastening the fluid reservoir (1) to the master cylinder housing (4). Fig. 65: Reservoir Mounting Courtesy of CHRYSLER GROUP, LLC 5. Pull the reservoir (1) straight up and remove it from the grommet seals in master cylinder housing (2). CAUTION: When removing the fluid reservoir (1) from the master cylinder, do not attempt to pry it off using any type of tool. This can damage the fluid reservoir or master cylinder housing. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 66: Seal On Rear Of Master Cylinder Courtesy of CHRYSLER GROUP, LLC 6. Remove the vacuum seal (2) from the master cylinder mounting flange (1). ASSEMBLY ASSEMBLY Fig. 67: Seal On Rear Of Master Cylinder Courtesy of CHRYSLER GROUP, LLC 1. Install a NEW vacuum seal (2) on the master cylinder mounting flange (1) making sure the seal fits squarely in its groove. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 68: Reservoir Mounting Courtesy of CHRYSLER GROUP, LLC 2. Lubricate the reservoir mounting area with fresh clean brake fluid. Place the reservoir (1) in position over the grommet seals in the master cylinder (2). Slide the reservoir into the grommet seals by firmly pressing down on the fluid reservoir. Once installed, make sure fluid reservoir is touching the top of both grommet seals. Fig. 69: Fluid Level Switch, Reservoir & Pin Courtesy of CHRYSLER GROUP, LLC 3. Install the pin (3) securing the reservoir (1) to the master cylinder (4). 4. If reusing the same reservoir, install the brake fluid level switch (2). A new reservoir will have a switch already installed. 5. Thoroughly bleed the master cylinder before installing it. Refer to MASTER CYLINDER, BRAKE, 2012 BRAKES Base - Service Information - Fiat 500 STANDARD PROCEDURE. 6. Install the master cylinder. Refer to MASTER CYLINDER, BRAKE, INSTALLATION. INSTALLATION INSTALLATION Fig. 70: Seal On Rear Of Master Cylinder Courtesy of CHRYSLER GROUP, LLC 1. Bench bleed the master cylinder. Refer to MASTER CYLINDER, BRAKE, STANDARD PROCEDURE. 2. Wipe the face of the power brake booster clean where the vacuum seal on the rear of the master cylinder comes in contact when it's installed. Do not get any cleaner or debris inside the booster. 3. If the master cylinder does not have a new vacuum seal (2) on the mounting flange (1), remove it. Install a NEW vacuum seal on the master cylinder mounting flange making sure the seal fits squarely in its groove. CAUTION: When installing a master cylinder on the vehicle, a NEW vacuum seal (2) MUST be installed on the master cylinder mounting flange (1). NOTE: The master cylinder must be bled before installing it on the vehicle. CAUTION: If resistance is met during master cylinder insertion into power brake booster, the master cylinder push rod may not be lined up with the booster push rod. Remove the master cylinder, realign and insert it again. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 71: Fluid Level Switch, Reservoir, Brake Tubes & Nuts Courtesy of CHRYSLER GROUP, LLC 4. Line up the master cylinder mounting holes with the mounting studs on the power brake booster. Ensure the master cylinder piston push rod lines up with the booster push rod, then carefully slide the master cylinder into the power brake booster until it contacts the face of the booster. 5. Install two NEW master cylinder mounting nuts (2). Tighten each nut to 25 N.m (18 ft. lbs.). 6. Connect the primary and secondary brake tubes (1) to the master cylinder outlet ports and Integrated Control Unit ports. Tighten the tube nuts to 17 N.m (150 in. lbs.). 7. Connect the wiring harness connector (3) to the brake fluid level switch. 8. Connect the vacuum hose to the check valve on the brake booster. Fig. 72: Clutch Actuator Port Plug Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Base - Service Information - Fiat 500 9. If equipped with a manual transaxle and a new reservoir is being installed, remove the plug (1) for the clutch actuator port. 10. If equipped with a manual transaxle, slide the clutch actuator hose onto the reservoir port. Install the hose clamp just past the upset bead on the port. Fig. 73: PCM, Retainers, Ground Strap & Nuts Courtesy of CHRYSLER GROUP, LLC 11. Position the battery tray and PCM in the vehicle. Route the wire harness and close the wire harness retainers (3). Fig. 74: Battery Tray, Connectors, Retainers, Nut & Bolts Courtesy of CHRYSLER GROUP, LLC 12. Install the battery tray (3) with one nut (5) and two bolts (1) tightened to 25 N.m (18 ft. lbs.). 13. Engage the engine wire harness connector (2) to the battery tray (3). 2012 BRAKES Base - Service Information - Fiat 500 14. Engage two engine wire harness retainers (4) to the battery tray (3). 15. Engage two starter wire harness retainers (6) to the battery tray (3). Fig. 75: PCM Electrical Connectors Courtesy of CHRYSLER GROUP, LLC 16. Connect the powertrain control module (PCM) electrical connectors (1 and 2). 17. Install the battery. Refer to BATTERY, INSTALLATION . Fig. 76: Air Cleaner Body Assembly Courtesy of CHRYSLER GROUP, LLC 18. Install the air cleaner body (4). Refer to BODY, AIR CLEANER, INSTALLATION or BODY, AIR CLEANER, INSTALLATION or BODY, AIR CLEANER, INSTALLATION . 2012 BRAKES Base - Service Information - Fiat 500 Fig. 77: Engine Cover Courtesy of CHRYSLER GROUP, LLC 19. Connect the negative (ground) cable on the battery. 20. Fill the master cylinder reservoir to the proper level. 21. Install the engine cover (1). 22. Install a scan tool to initialize the ABM and perform the following: 1. Clear any faults. 2. Fill the master cylinder to the proper fill level and bleed the base and ABS hydraulic systems. Refer to STANDARD PROCEDURE. . 3. Check for leaks. 4. Perform the ABS Verification Test. Refer to ABS VERIFICATION TEST . 23. Road test the vehicle to ensure proper operation of the brakes. PADS, BRAKE, FRONT REMOVAL REMOVAL WARNING: Be certain a firm brake pedal is achieved prior to attempting to operate the vehicle. If a firm brake pedal cannot be achieved, bleed the brake hydraulic system and check for leaks. Refer to STANDARD PROCEDURE. . 2012 BRAKES Base - Service Information - Fiat 500 Fig. 78: Wheel Lug Bolts Courtesy of CHRYSLER GROUP, LLC 1. Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE . 2. Remove the wheel mounting bolts (1), then the tire and wheel assembly. Fig. 79: Brake Pad Clip NOTE: Before proceeding, refer to CAUTION and WARNING. . NOTE: Perform 2 through 7 on each side of the vehicle to complete pad set removal. 2012 BRAKES Base - Service Information - Fiat 500 Courtesy of CHRYSLER GROUP, LLC 3. Remove brake pad clip (1) from brake caliper. Fig. 80: Brake Caliper, Mounting Bolts & Guide Pin Bolts Courtesy of CHRYSLER GROUP, LLC 4. Remove caps from caliper guide pin bolts, if equipped. 5. Remove the two brake caliper guide pin bolts (2). 6. Remove the disc brake caliper (3) from the disc brake adapter bracket and hang it out of the way using wire or a bungee cord. Use care not to overextend the brake hose when doing this. Fig. 81: Front Brake Caliper Adapter Bracket & Pads Courtesy of CHRYSLER GROUP, LLC 2012 BRAKES Base - Service Information - Fiat 500 7. Remove the brake pads (4, 5) from the caliper adapter bracket (2). CLEANING CLEANING INSPECTION INSPECTION Visually inspect brake pads for uneven lining wear. Also inspect for excessive lining deterioration. Check the clearance between the tips of the wear indicators (if equipped) on the pads and the brake rotors. If a visual inspection does not adequately determine the condition of the lining, a physical check will be necessary. To check the amount of lining wear, remove the disc brake pads from the vehicle. Fig. 82: Brake Pad Friction Material Thickness Measurement Courtesy of CHRYSLER GROUP, LLC WARNING: Chrysler LLC does not manufacture any vehicles or replacement parts that contain asbestos. Aftermarket products may or may not contain asbestos. Refer to aftermarket product packaging for product information. Whether the product contains asbestos or not, dust and dirt can accumulate on brake parts during normal use. Follow practices prescribed by appropriate regulations for the handling, processing and disposing of dust and debris. 1 - BRAKE SHOE ASSEMBLY FRICTION MATERIAL THICKNESS IS TO BE MEASURED AT THE THINNEST POINT. 2 - BRAKE SHOE ASSEMBLY FRICTION MATERIAL 3 - BRAKE SHOE ASSEMBLY BACKING PLATE 2012 BRAKES Base - Service Information - Fiat 500 Measure brake pad minimum thickness (1). Brake pads must be replaced when usable material on a brake pad lining (2) measured at its thinnest point measures one millimeter (0.04 inches) or less. If a brake pad fails inspection, replace both disc brake pads (inboard and outboard) at each caliper. It is also necessary to replace the pads on the opposite side of the vehicle as well as the pads failing inspection to maintain proper braking characteristics. If the brake pad assemblies do not require replacement, be sure to reinstall the brake pads in the original position they were removed from. INSTALLATION INSTALLATION Fig. 83: Front Brake Caliper Adapter Bracket & Pads Courtesy of CHRYSLER GROUP, LLC 1. Place the brake pads (4, 5) in the abutment shims (3) clipped into the disc brake caliper adapter bracket (2) as shown in illustration. Place the pad with the wear indicator attached on the inboard side. 2. Completely retract the caliper piston back into the bore of the caliper. NOTE: It is important to inspect both front and rear brake pads during the same inspection. NOTE: Perform 1 through 6 on each side of the vehicle to complete pad set installation, then proceed to 7. NOTE: Make sure that the audible wear indicators (if equipped) are placed toward the top when the inboard brake pads are installed on each side of the vehicle. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 84: Brake Caliper, Mounting Bolts & Guide Pin Bolts Courtesy of CHRYSLER GROUP, LLC 3. Install the disc brake caliper (3) over the brake pads on the brake caliper adapter bracket. 4. Align the caliper guide pin bolt holes with the adapter bracket. Install the caliper guide pin bolts (2) and tighten to 28 N.m (21 ft. lbs.). Fig. 85: Brake Pad Clip Courtesy of CHRYSLER GROUP, LLC 5. Install brake pad retainer clip (1). CAUTION: Use care when installing the caliper onto the adapter bracket to avoid damaging the guide pin boots. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 86: Wheel Lug Bolts Courtesy of CHRYSLER GROUP, LLC 6. Install the tire and wheel assembly. Refer to INSTALLATION . 7. Lower the vehicle. Fig. 87: Master Cylinder Fill Markings Courtesy of CHRYSLER GROUP, LLC 8. Pump the brake pedal several times before moving the vehicle to set the pads to the brake rotor. 9. Check and adjust the brake fluid level in the reservoir (2) as necessary. 10. Road test the vehicle and make several stops to wear off any foreign material on the brakes and to seat the brake pads. 2012 BRAKES Base - Service Information - Fiat 500 PADS, BRAKE, REAR REMOVAL REMOVAL Fig. 88: Wheel Lug Bolts Courtesy of CHRYSLER GROUP, LLC 1. Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE . 2. Remove the wheel mounting bolts (1), then the tire and wheel assembly. NOTE: Before proceeding, refer to CAUTION and WARNING. . 2012 BRAKES Base - Service Information - Fiat 500 Fig. 89: Parking Brake Cable, Flex Hose & Guide Pin Bolts Courtesy of CHRYSLER GROUP, LLC 3. While holding the slider pins stationary, remove the disc brake caliper guide pin bolts (1). 4. Remove the caliper from the caliper mounting bracket. Hang the caliper using wire or a bungee cord. Fig. 90: Caliper Adapter Bracket, Mounting Bolts & Brake Pads Courtesy of CHRYSLER GROUP, LLC 5. Remove the inboard brake pad (4) from the caliper adapter bracket (2). 6. Remove the outboard brake pad (3) from the caliper adapter bracket (2) by prying the brake pad outward until it clears the bracket and then remove the pad from the vehicle. CAUTION: Never allow the disc brake caliper to hang from the brake hose. Damage to the brake hose will result. Provide a suitable support to hang the caliper securely. 2012 BRAKES Base - Service Information - Fiat 500 CLEANING CLEANING INSPECTION INSPECTION Visually inspect brake pads for uneven lining wear. Also inspect for excessive lining deterioration. Check the clearance between the tips of the wear indicators (if equipped) on the pads and the brake rotors. If a visual inspection does not adequately determine the condition of the lining, a physical check will be necessary. To check the amount of lining wear, remove the disc brake pads from the vehicle. Fig. 91: Brake Pad Friction Material Thickness Measurement Courtesy of CHRYSLER GROUP, LLC Measure brake pad minimum thickness (1). Brake pads must be replaced when usable material on a brake pad lining (2) measured at its thinnest point measures one millimeter (0.04 inches) or less. WARNING: Chrysler LLC does not manufacture any vehicles or replacement parts that contain asbestos. Aftermarket products may or may not contain asbestos. Refer to aftermarket product packaging for product information. Whether the product contains asbestos or not, dust and dirt can accumulate on brake parts during normal use. Follow practices prescribed by appropriate regulations for the handling, processing and disposing of dust and debris. 1 - BRAKE SHOE ASSEMBLY FRICTION MATERIAL THICKNESS IS TO BE MEASURED AT THE THINNEST POINT. 2 - BRAKE SHOE ASSEMBLY FRICTION MATERIAL 3 - BRAKE SHOE ASSEMBLY BACKING PLATE 2012 BRAKES Base - Service Information - Fiat 500 If a brake pad fails inspection, replace both disc brake pads (inboard and outboard) at each caliper. It is also necessary to replace the pads on the opposite side of the vehicle as well as the pads failing inspection to maintain proper braking characteristics. If the brake pad assemblies do not require replacement, be sure to reinstall the brake pads in the original position they were removed from. INSTALLATION INSTALLATION Fig. 92: Seating Piston With Special Tool Courtesy of CHRYSLER GROUP, LLC 1. Seat (bottom) the caliper piston in the bore as follows: 1. Assemble a 3/8 in. drive ratchet handle and an extension (3). 2. Insert the extension through Rear Caliper Piston Retractor (special tool #8807-1, Assembly, Forcing Screw) (2). 3. Place Rear Caliper Piston Retractor (special tool #8807-2, Adapter) (1) on the end of the extension. 4. Insert lugs on Rear Caliper Piston Retractor (special tool #8807-2, Adapter) into notches in face of caliper piston (5). 5. Thread the screw drive on Rear Caliper Piston Retractor (special tool #8807-1, Assembly, Forcing Screw) down until it contacts the top of Rear Caliper Piston Retractor (special tool #8807-2, Adapter) which is against the caliper piston. Do not over tighten the screw-drive. Damage to the NOTE: It is important to inspect both front and rear brake pads during the same inspection. NOTE: If a rear caliper piston in this vehicle needs to be seated in its bore, Rear Caliper Piston Retractor (special tool #8807, Retractor, Rear Caliper Piston) must be used. If an attempt is made to force the piston back in the bore with a clamp or other method, damage will occur to the Integrated Park Brake. 2012 BRAKES Base - Service Information - Fiat 500 piston can occur. 6. Turn Rear Caliper Piston Retractor (special tool #8807-2, Adapter) with the ratchet, rotating the piston in a clockwise direction until fully seated (bottomed) in the bore. It may be necessary to turn Rear Caliper Piston Retractor (special tool #8807-1, Assembly, Forcing Screw) with Rear Caliper Piston Retractor (special tool #8807-2, Adapter) to start the process of piston retraction. Fig. 93: Caliper Adapter Bracket, Mounting Bolts & Brake Pads Courtesy of CHRYSLER GROUP, LLC 2. Slide the outboard brake pad (3) in the abutment shims clipped into the caliper adapter bracket (2). 3. Place the inboard brake pad (4) in the abutment shims. Be sure that both pads are bottomed in their shims. NOTE: Place the brake pad with the audible wear indicator attached on the inboard side. The audible wear indicator should be positioned at the bottom when installed. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 94: Parking Brake Cable, Flex Hose & Guide Pin Bolts Courtesy of CHRYSLER GROUP, LLC 4. Install the disc brake caliper over the brake rotor and caliper adapter. 5. Install the disc brake caliper guide pin bolts (1). While holding the slide pins stationary, tighten the guide pin bolts to 34 N.m (25 ft. lbs.). Fig. 95: Wheel Lug Bolts CAUTION: Use care when installing the caliper onto the adapter bracket to avoid damaging the guide pin boot. NOTE: There is a small post on the lower backside of the inboard pad. Make sure that this post lines up with one of the slots on the piston to ensure the pad interfaces with the piston correctly. 2012 BRAKES Base - Service Information - Fiat 500 Courtesy of CHRYSLER GROUP, LLC 6. Install the tire and wheel assembly. Refer to INSTALLATION . 7. Lower the vehicle. 8. Pump the brake pedal several times to ensure the vehicle has a firm brake pedal before moving the vehicle. 9. Road test the vehicle and make several stops to wear off any foreign material on the brakes and to seat the brake pads. PEDAL(S), BRAKE AND/OR ACCELERATOR REMOVAL REMOVAL 1. Disconnect and isolate the battery negative cable from its post on the battery. 2. If equipped, remove the knee blocker air bag. Refer to AIR BAG, KNEE BLOCKER, REMOVAL . Fig. 96: Lower Coupling Bolt Courtesy of CHRYSLER GROUP, LLC 3. Remove intermediate shaft pinch bolt (3) and separate the intermediate shaft (2) at the base of the column from the steering gear pinion shaft (4). Discard the pinch bolt (3) it is not to be reused. 4. Position the intermediate shaft (2) so that the pedal assembly can be accessed. NOTE: Before proceeding, refer to CAUTION and WARNING. . 2012 BRAKES Base - Service Information - Fiat 500 Fig. 97: Support Bracket & Bolts Courtesy of CHRYSLER GROUP, LLC 5. Remove the two mounting bolts (1) from the support bracket (2). 6. Remove the support bracket (2). Fig. 98: Brake Pedal Sled & Nuts Courtesy of CHRYSLER GROUP, LLC 7. Remove the stop lamp switch. Refer to SWITCH, STOP LAMP, REMOVAL . 8. Disengage the tabs holding the push rod to the pedal, and separate the push rod from the pedal assembly. 9. Remove the four nuts (3) attaching the brake pedal sled (1) (and power brake booster) to the dash panel. 10. Remove the remaining two nuts (2) attaching the brake pedal sled (1) to the dash panel. 11. Remove the brake pedal sled (1). 2012 BRAKES Base - Service Information - Fiat 500 Fig. 99: Brake Pedal Assembly & Keeper Courtesy of CHRYSLER GROUP, LLC 12. Remove the brake pedal keeper (2) from the brake pedal assembly (1) by pressing outwards on the wings of the keeper and then in towards the pedal assembly. 13. The brake pedal keeper must be discarded and cannot be reused. INSTALLATION INSTALLATION Fig. 100: Brake Pedal Assembly & Keeper Courtesy of CHRYSLER GROUP, LLC NOTE: The brake pedal keeper (2) cannot be reused. Always install a new keeper if the brake pedal push rod was separated from the keeper. 2012 BRAKES Base - Service Information - Fiat 500 1. Install a NEW booster rod keeper (2) by pressing the keeper onto the backside of the brake pedal assembly (1). 2. Press the keeper until the wings (2) snap onto the brake pedal assembly to ensure it is secured to the assembly. Fig. 101: Brake Pedal Sled & Nuts Courtesy of CHRYSLER GROUP, LLC 3. Carefully install the brake pedal and bracket assembly (1) in the vehicle lining up the bracket with the power brake booster mounting studs and the studs on the dash panel. 4. Install the four nuts (3) attaching the brake pedal (1) (and power brake booster) to the dash panel. Do not tighten the nuts at this time. 5. Install the two remaining nuts (2) attaching the brake pedal sled (1) to the dash panel. Tighten these nuts to 23 N.m (17 ft. lbs.). 6. Tighten the brake pedal/booster mounting nuts to 23 N.m (17 ft. lbs.). 7. Install the power brake booster push rod into the back of the pedal, ensuring that the tabs are engaged. 8. Install and adjust the stop lamp switch in the brake pedal bracket. Refer to SWITCH, STOP LAMP, INSTALLATION . 2012 BRAKES Base - Service Information - Fiat 500 Fig. 102: Support Bracket & Bolts Courtesy of CHRYSLER GROUP, LLC 9. Install the support bracket (2). 10. Install support bracket mounting bolts (1) and tighten to 20 N.m (15 ft. lbs.). Fig. 103: Lower Coupling Bolt Courtesy of CHRYSLER GROUP, LLC 11. Verify the front wheels of vehicle are in the STRAIGHT-AHEAD position. 12. Install the intermediate shaft (2) into the vehicle. Slide the intermediate shaft onto the steering gear pinion NOTE: A new pinch bolt (3) must be installed every time the pinch bolt is removed. 2012 BRAKES Base - Service Information - Fiat 500 shaft (4). 13. Install a NEW pinch bolt (3) and tighten to 55 N.m (40 ft. lbs.). 14. Install the knee blocker airbag. Refer to AIR BAG, KNEE BLOCKER, INSTALLATION . 15. If equipped, install the silencer pad below the instrument panel. 16. Connect the battery negative cable to its post on the battery. 17. Check the stop lamps to verify they are operating properly and not staying on when the pedal is in the released position. 18. Road test the vehicle to ensure proper operation of the brakes. ROTOR, BRAKE DIAGNOSIS AND TESTING DIAGNOSIS AND TESTING - BRAKE ROTOR Any servicing of the rotor requires extreme care to maintain the rotor within service tolerances to ensure proper brake action. Excessive runout or wobble in a rotor can increase pedal travel due to piston knock-back. This increases guide pin sleeve wear due to the tendency of the caliper to follow the rotor wobble. When diagnosing a brake noise or pulsation, the machined disc braking surface should be inspected. BRAKING SURFACE INSPECTION Light braking surface scoring and wear is acceptable. If heavy scoring or warping is evident, the rotor must be refaced or replaced. Excessive wear and scoring of the rotor can cause improper lining contact on the rotor's braking surface. If the ridges on the rotor are not removed before new brake shoes are installed, improper wear of the shoes will result. If a vehicle has not been driven for a period of time, the rotor's braking surface will rust in the areas not covered by the brake shoes at that time. Once the vehicle is driven, noise and chatter from the disc brakes can result when the brakes are applied. Some discoloration or wear of the rotor surface is normal and does not require resurfacing when linings are replaced. If cracks or burned spots are evident, the rotor must be replaced. ROTOR MINIMUM THICKNESS 2012 BRAKES Base - Service Information - Fiat 500 Fig. 104: Measuring Rotor Thickness Courtesy of CHRYSLER GROUP, LLC Measure rotor thickness (1) at the center of the brake pad contact surface. Replace the rotor if it is worn below minimum thickness or if machining the rotor will cause its thickness to fall below specifications. Fig. 105: Front Rotor Minimum Thickness Marks Courtesy of CHRYSLER GROUP, LLC On front rotors, Minimum thickness specifications (2) are cast on the rotor's unmachined surface on the inside CAUTION: Do not machine the rotor if it will cause the rotor to fall below minimum thickness. 2012 BRAKES Base - Service Information - Fiat 500 of the rotor (1). Fig. 106: Rear Rotor Maximum Dia/Min Thickness Marks Courtesy of CHRYSLER GROUP, LLC On rear rotors, Minimum thickness specifications (3) are cast into the rotor's unmachined surface on the outside of the rotor (1). This area also shows the maximum thickness specifications (2) for the hat section of the rotor. ROTOR THICKNESS VARIATION Fig. 107: Measuring Rotor Thickness Courtesy of CHRYSLER GROUP, LLC Thickness variation in a rotor's braking surface can result in pedal pulsation, chatter and surge. This can also be 2012 BRAKES Base - Service Information - Fiat 500 caused by excessive runout in the rotor or the hub. Rotor thickness variation measurements should be made in conjunction with measuring runout. Measure thickness of the brake rotor (2) at 12 equal points around the rotor braking surface with a micrometer (1) at a radius approximately 25 mm (1 inch) from edge of rotor. 1. If excessive rotor thickness variation is found, reface or replace brake rotor. Refer to ROTOR, BRAKE, STANDARD PROCEDURE. ROTOR RUNOUT Fig. 108: Measuring Rotor Runout Courtesy of CHRYSLER GROUP, LLC On-vehicle rotor runout is the combination of the individual runout of the hub face and the runout of the brake rotor (hub runout can be measured separately). To measure rotor runout on the vehicle: 1. Raise and support the vehicle. 2. Remove the tire and wheel assembly. Refer to REMOVAL . 3. Install standard wheel mounting nuts, flat side to rotor, on all the wheel studs (2). Progressively tighten the nuts in a crisscross pattern to 135 N.m (100 ft. lbs.). 4. Mount Dial Indicator (special tool #C-3339A, Set, Dial Indicator) (1) with Wheel (special tool #25-W, Roller Contact Point), or equivalent, to the knuckle. Position the dial indicator wheel to contact the rotor braking surface approximately 10 mm (0.39 in.) from the outer edge of the rotor (3). 5. Slowly rotate the brake rotor checking lateral runout, marking the low and high spots. Record these measurements. 6. Check and record the runout on the opposite side of the rotor in the same fashion, marking the low and high spots. 7. Compare runout measurement to specifications. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 109: Wheel Stud & Rotor Index Marked Courtesy of CHRYSLER GROUP, LLC 8. If runout is in excess of specifications, check the lateral runout of the hub face. Before removing the rotor from the hub, place a chalk mark across both the rotor (1) and the one wheel stud (2) closest to where the high runout measurement was taken. This way, the original mounting spot of the rotor on the hub is indexed. 9. Remove the rotor from the hub. Refer to ROTOR, BRAKE, REMOVAL. Fig. 110: Measuring Hub Runout Courtesy of CHRYSLER GROUP, LLC NOTE: Before measuring hub runout, clean the hub face surface with an 2012 BRAKES Base - Service Information - Fiat 500 10. Mount Dial Indicator (special tool #C-3339A, Set, Dial Indicator) (2) to the knuckle. Position the dial indicator stem so it contacts the hub face (1) near the outer diameter. Care must be taken to position the stem outside of the stud circle, but inside of the chamfer on the hub rim. 11. Slowly rotate the hub measuring runout. Hub runout should not exceed 0.040 mm (0.0016 inch). If runout exceeds this specification, the hub must be replaced. Refer to KNUCKLE, STEERING, REMOVAL and REMOVAL . For rear brakes, refer to HUB AND BEARING, REMOVAL . Fig. 111: Rotor Reindexed On Wheel Studs Courtesy of CHRYSLER GROUP, LLC 12. If hub runout does not exceed this specification, install the original rotor back on the hub, aligning the chalk mark on the rotor (2) with a wheel mounting stud, two studs apart from the original stud (1). appropriate cleaner. This provides a clean surface to get an accurate indicator reading. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 112: Measuring Rotor Runout Courtesy of CHRYSLER GROUP, LLC 13. Install standard wheel mounting nuts, flat side to rotor, on all the wheel studs (2). Progressively tighten the nuts in a crisscross pattern to 135 N.m (100 ft. lbs.). 14. Mount the Dial Indicator (special tool #C-3339A, Set, Dial Indicator) (1) and remeasure runout on both sides of the brake rotor as explained in earlier steps to see if runout is now within specifications. 15. If runout is still not within specifications, reface or replace brake rotor. Refer to ROTOR, BRAKE, STANDARD PROCEDURE. STANDARD PROCEDURE STANDARD PROCEDURE - BRAKE ROTOR MACHINING Any servicing of the rotor requires extreme care to maintain the rotor within service tolerances to ensure proper brake action. NOTE: Refacing the rotor is not required each time the brake pads are replaced, only when the need is foreseen. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 113: On-Car Brake Lathe Courtesy of CHRYSLER GROUP, LLC If the rotor surface is deeply scored or warped, or there is a complaint of brake roughness or brake pedal pulsation, the rotor should be refaced using a hub-mounted on-car brake lathe (1), or replaced. The use of a hub-mounted on-car brake lathe (1) is highly recommended to eliminate the possibility of excessive runout. It trues the brake rotor to the vehicle's hub and bearing. Fig. 114: Front Rotor Minimum Thickness Marks Courtesy of CHRYSLER GROUP, LLC 1 - ON-CAR BRAKE LATHE NOTE: All brake rotors (1) have markings for minimum allowable thickness cast on an unmachined surface of the rotor (2) or stamped into the hat section. On this 2012 BRAKES Base - Service Information - Fiat 500 Minimum allowable thickness is the minimum thickness which the brake rotor machined surface may be cut to. Before lathe installation, verify the brake rotor face and the hub adapters are free of any chips, rust, or contamination. When mounting and using the brake lathe, strict attention to the brake lathe manufacturer's operating instructions is required. Machine both sides of the brake rotor at the same time. Cutting both sides at the same time minimizes the possibility of a tapered or uneven cut. When refacing a rotor, the required TIR (Total Indicator Reading) and thickness variation limits MUST BE MAINTAINED. Extreme care in the operation of rotor turning equipment is required. REMOVAL FRONT BRAKE ROTOR Fig. 115: Wheel Lug Bolts Courtesy of CHRYSLER GROUP, LLC vehicle, the minimum thickness specification for the front brake rotor is located on the inside of the rotor. The minimum thickness specification for the rear brake rotor is located on the outside of the rotor. CAUTION: Do not machine the rotor if it will cause the rotor to fall below minimum thickness. NOTE: Before proceeding, refer to CAUTION and WARNING. 2012 BRAKES Base - Service Information - Fiat 500 1. Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE . 2. Remove the wheel cover with a soft prying tool. 3. Remove the wheel mounting bolts (1), then the tire and wheel assembly. Fig. 116: Brake Caliper, Mounting Bolts & Guide Pin Bolts Courtesy of CHRYSLER GROUP, LLC 4. Remove the two bolts (1) securing disc brake caliper and adapter bracket (3) to the steering knuckle. 5. Remove the disc brake caliper and adapter bracket (3) from the knuckle and rotor as an assembly. Hang the assembly out of the way using wire or a bungee cord. . CAUTION: Never allow the disc brake caliper to hang from the brake hose. Damage to the brake hose will result. Provide a suitable support to hang the caliper securely. NOTE: In some cases, it may be necessary to retract the caliper piston in its bore a small amount in order to provide sufficient clearance between the pads and the rotor to easily remove the caliper from the knuckle. This can usually be accomplished before the guide pin bolts are removed, by grasping the inboard side of the caliper and pulling outward working with the guide pins, thus retracting the piston. Never push on the piston directly as it may get damaged. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 117: Brake Rotor & Studs Courtesy of CHRYSLER GROUP, LLC 6. Remove studs (1) retaining the brake rotor (2) to the hub assembly. 7. Slide the brake rotor (2) off the hub and bearing. REAR BRAKE ROTOR Fig. 118: Wheel Lug Bolts Courtesy of CHRYSLER GROUP, LLC 1. Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE . 2. Remove the wheel cover with a soft prying tool. NOTE: Before proceeding, refer to CAUTION and WARNING. 2012 BRAKES Base - Service Information - Fiat 500 3. Remove the wheel mounting bolts (1), then the tire and wheel assembly. Fig. 119: Parking Brake Cable, Flex Hose & Guide Pin Bolts Courtesy of CHRYSLER GROUP, LLC 4. While holding the hex fitting on the caliper slides, remove caliper guide pin bolts (1). 5. Remove caliper from mounting bracket and support with a bungee cord or wire. Do not let it hang from the brake hose. Fig. 120: Caliper Adapter Bracket, Mounting Bolts & Brake Pads Courtesy of CHRYSLER GROUP, LLC 6. Remove caliper bracket mounting bolts (1) and remove caliper mounting bracket (2). 2012 BRAKES Base - Service Information - Fiat 500 Fig. 121: Wheel Mounting Pins Courtesy of CHRYSLER GROUP, LLC 7. Remove retaining studs (1) and slide brake rotor off the hub and bearing. INSTALLATION FRONT BRAKE ROTOR Fig. 122: Brake Rotor & Studs Courtesy of CHRYSLER GROUP, LLC 1. Clean the hub face to remove any dirt or corrosion where the rotor mounts. 2. Install the brake rotor (2) on the hub and bearing. NOTE: Inspect disc brake pads before installation. Refer to INSPECTION. . 2012 BRAKES Base - Service Information - Fiat 500 3. Install retaining pins (1) and tighten to 12 N.m (106 in. lbs.). Fig. 123: Brake Caliper, Mounting Bolts & Guide Pin Bolts Courtesy of CHRYSLER GROUP, LLC 4. Install the disc brake caliper and adapter bracket assembly (3) over the brake rotor and knuckle. 5. Install the mounting bolts (1) securing the caliper adapter bracket to the knuckle and tighten to 105 N.m (77 ft. lbs.). Fig. 124: Wheel Lug Bolts Courtesy of CHRYSLER GROUP, LLC 6. Install the tire and wheel assembly. Refer to INSTALLATION . 7. Lower the vehicle. 8. Pump the brake pedal several times before moving the vehicle to set the pads to the brake rotor. 2012 BRAKES Base - Service Information - Fiat 500 9. Check and adjust the brake fluid level in the reservoir as necessary. 10. Road test the vehicle and make several stops to seat the brake pads to the rotor. REAR BRAKE ROTOR Fig. 125: Wheel Mounting Pins Courtesy of CHRYSLER GROUP, LLC 1. Clean the hub face to remove any dirt or corrosion where the rotor mounts. 2. Install the brake rotor on the hub and bearing. 3. Install rotor mounting pins (1) and tighten to 12 N.m (106 in. lbs.). Fig. 126: Caliper Adapter Bracket, Mounting Bolts & Brake Pads NOTE: Inspect disc brake pads before installation. Refer to INSPECTION. . 2012 BRAKES Base - Service Information - Fiat 500 Courtesy of CHRYSLER GROUP, LLC 4. Install caliper mounting bracket (2) and install two mounting bolts (1). Tighten mounting bolts (1) to 57 N.m (42 ft. lbs.). Fig. 127: Parking Brake Cable, Flex Hose & Guide Pin Bolts Courtesy of CHRYSLER GROUP, LLC 5. Install the disc brake caliper over the brake rotor and caliper adapter. 6. Install the disc brake caliper guide pin bolts (1). While holding the hex fitting on the caliper slides, tighten the guide pin bolts (1) to 34 N.m (25 ft. lbs.). CAUTION: Use care when installing the caliper onto the adapter bracket to avoid damaging the guide pin boot. NOTE: There is a small post on the lower backside of the inboard pad. Make sure that this post lines up with one of the slots on the piston to ensure the pad interfaces with the piston correctly. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 128: Wheel Lug Bolts Courtesy of CHRYSLER GROUP, LLC 7. Install tire and wheel assembly. Refer to INSTALLATION . 8. Lower the vehicle. 9. Pump the brake pedal several times before moving the vehicle to set the pads to the brake rotor. 10. Check and adjust the brake fluid level in the reservoir as necessary. 11. Road test the vehicle and make several stops to seat the brake pads to the rotor. TUBES AND HOSES, BRAKE REMOVAL REAR FLEXIBLE HOSE 1. Install prop rod on the brake pedal to keep pressure on the brake system. Holding pedal in this position will isolate master cylinder from hydraulic brake system and will not allow brake fluid to drain out of brake fluid reservoir while brake lines are open. This will allow you to bleed out the area of repair instead of the entire system. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 129: Flexible Hose, Solid Line & Clip Courtesy of CHRYSLER GROUP, LLC 2. Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE . 3. Remove the tire and wheel assembly. 4. Remove the solid brake line fitting (3). 5. Remove the retaining clip (2) securing the flexible brake hose (1) to the mounting bracket. Fig. 130: Flexible Brake Hose & Fitting Courtesy of CHRYSLER GROUP, LLC 6. Remove the flexible brake hose (2) from the front bracket. 7. Remove the brake hose fitting (1) from the caliper and remove the brake hose from the vehicle. INSPECTION 2012 BRAKES Base - Service Information - Fiat 500 INSPECTION Brake tubing should be inspected periodically for evidence of physical damage or contact with moving or hot components. Flexible rubber hose is used at both the front and rear wheel brakes. Inspection of the flexible brake hoses should be performed whenever the brake system is serviced and every 12, 000 km (7, 500 miles) or 12 months, whichever comes first. Inspect hydraulic brake hoses for surface cracking, scuffing, or worn spots. If the fabric casing of the hose becomes exposed due to cracks or abrasions in the hose cover, the hose should be replaced immediately. Eventual deterioration of the hose can take place with possible burst failure. Faulty installation can cause twisting, resulting in wheel, tire, or chassis interference. INSTALLATION REAR FLEXIBLE HOSE Fig. 131: Flexible Brake Hose & Fitting Courtesy of CHRYSLER GROUP, LLC 1. Position the flexible brake hose (2) near the installed position. 2. Install the rear brake hose fitting (1) to the caliper and tighten to 16 N.m (142 in. lbs.). NOTE: This vehicle is equipped with more than one size (diameter) brake tube depending on location on the vehicle. If a brake tube must be replaced, always use the same size brake tubing as that being replaced. Never use under-size brake tubing. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 132: Flexible Hose, Solid Line & Clip Courtesy of CHRYSLER GROUP, LLC 3. Position the flexible brake hose (1) through the bracket and install the retaining clip (2). 4. Install the solid brake line fitting (3) and tighten to 16 N.m (142 in. lbs.). 5. Install the tire and wheel assembly. Refer to INSTALLATION . 6. Lower the vehicle. 7. Remove the prop rod from the brake pedal. 8. Bleed the area of repair for the brake system. If a proper pedal is not felt during bleeding an area of repair then a base bleed system must be performed . Refer to STANDARD PROCEDURE. . PARKING BRAKE DESCRIPTION DESCRIPTION The parking brakes consist of the following components:  Hand-operated park brake lever  Parking brake cables (one each side)  Caliper equalizer  Caliper with Integrated Parking Brake (IPB) All vehicles are equipped with a center-mounted, hand-operated parking brake lever mounted between the front seats. The parking brake must be manually adjusted after it is disconnected or when replacing components. There is an individual parking brake cable for each rear wheel that joins a parking brake cable equalizer, attached to the parking brake lever, to the rear parking brakes. The parking brake cables are made of flexible steel cable. 2012 BRAKES Base - Service Information - Fiat 500 The brake caliper used for the foundation brakes features an Integral Parking Brake (IPB) which combines a mechanical parking brake function with a conventional rear caliper. This caliper features a lever attached to a shaft on the outside of the caliper. The lever uses a ball-ramp mechanism to mechanically apply piston clamp force to the rear rotor when the parking brake lever is applied. As the lever and shaft rotate, the ball-ramp interface causes the shaft to lift and the piston to travel toward the rotor. STANDARD PROCEDURE STANDARD PROCEDURE - PARKING BRAKE ADJUSTMENT Fig. 133: Parking Brake Handle & Adjuster Nut Courtesy of CHRYSLER GROUP, LLC 1. Remove the floor console. Refer to CONSOLE, FLOOR, REMOVAL . 2. Place the parking brake handle (5) in the completely lowered position. 3. Back the adjuster nut (4) off until there is no tension on the parking brake cable. 4. Tighten the adjuster nut (4) until tension begins to be felt on the cables. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 134: Parking Brake Actuating Lever & Parking Brake Stop Courtesy of CHRYSLER GROUP, LLC 5. Look under vehicle and ensure that the parking brake actuating lever (1) has not lifted off of the parking brake stop (2) on both sides of the vehicle. 6. If lever is off of the stop, it will be necessary to go back inside the vehicle and loosen the adjuster nut. 7. Once there is tension on the parking brake cables and both actuating levers are still on their resting tabs, actuate the parking brake to ensure that it is functioning properly. 8. Install the floor console. Refer to CONSOLE, FLOOR, INSTALLATION . CABLE, PARKING BRAKE REMOVAL REMOVAL 2012 BRAKES Base - Service Information - Fiat 500 Fig. 135: Parking Brake Handle & Adjuster Nut Courtesy of CHRYSLER GROUP, LLC 1. Disconnect and isolate the battery negative cable from its post on the battery. 2. Block the tire and wheel assemblies so the vehicle does not move once the vehicle parking brake lever is released. 3. Remove the floor console. Refer to CONSOLE, FLOOR, REMOVAL . 4. Release and lower the parking brake lever (5). 5. Loosen the adjusting nut (4) on the equalizer output cable and disconnect the brake actuation cables from the equalizer. 6. Remove the parking brake cables from the parking brake cable equalizer (3). Fig. 136: Parking Brake Cable, Flex Hose & Guide Pin Bolts Courtesy of CHRYSLER GROUP, LLC 7. Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE . 8. Remove parking brake cable from each mounting bracket. 9. Disconnect brake cable end (2) from caliper bracket and slide brake cable through bracket. 10. Remove parking brake cable from vehicle. INSTALLATION INSTALLATION NOTE: Before proceeding, refer to CAUTION and WARNING. NOTE: The procedure below applies to either of the two parking brake cables. 2012 BRAKES Base - Service Information - Fiat 500 Fig. 137: Parking Brake Cable, Flex Hose & Guide Pin Bolts Courtesy of CHRYSLER GROUP, LLC 1. Install parking brake cable through the hole in the body. 2. Route the cable along the rear axle assembly, attaching to the retainers as it is fed to the rear of the vehicle. 3. Slide the cable through the bracket on the rear caliper. 4. Attach the cable end (2) to the brake caliper actuator arm. 5. Install the tire and wheel assembly. Refer to INSTALLATION . Fig. 138: Parking Brake Handle & Adjuster Nut Courtesy of CHRYSLER GROUP, LLC NOTE: The following procedure applies to either the left or right parking brake cable. 2012 BRAKES Base - Service Information - Fiat 500 6. Lower the vehicle. 7. Ensure that the parking brake handle (5) is in the lowered position. 8. Attach parking brake cable to the equalizer (3). 9. Perform parking brake adjustment procedure. Refer to PARKING BRAKE, STANDARD PROCEDURE. 10. Install the floor console. Refer to CONSOLE, FLOOR, INSTALLATION . 11. Remove the blocks from the tires and wheel assemblies. 12. Connect the battery negative cable to its post on the battery. LEVER, PARKING BRAKE REMOVAL REMOVAL Fig. 139: Parking Brake Handle & Adjuster Nut Courtesy of CHRYSLER GROUP, LLC 1. Disconnect and isolate the battery negative cable. 2. Block the tire and wheel assemblies so the vehicle does not move once the vehicle parking brake lever is released. 3. Remove the floor console. Refer to CONSOLE, FLOOR, REMOVAL . 4. Position parking brake boot (1) so that the mounting bolts and switch can be accessed. 5. Release and lower the parking brake lever (5). 6. Loosen the adjusting nut (4) on the equalizer and disconnect the brake actuation cables from the equalizer. 7. Disconnect the wiring harness connector (6) from the parking brake switch. 8. Remove the bolts (2) attaching the parking brake lever (5) to the vehicle. 2012 BRAKES Base - Service Information - Fiat 500 9. Remove the parking brake lever (5). INSTALLATION INSTALLATION Fig. 140: Parking Brake Handle & Adjuster Nut Courtesy of CHRYSLER GROUP, LLC 1. Place the parking brake lever (6) on the floor pan and install mounting bolts (2). Tighten the bolts to 30 N.m (22 ft. lbs.). 2. Install the rear parking brake cables into the equalizer (3) on the parking brake lever output cable. 3. Connect the wiring harness connector (2) to the parking brake switch (6). 4. Perform parking brake adjustment procedure. Refer to STANDARD PROCEDURE - PARKING BRAKE ADJUSTMENT. 5. Install the center floor console. Refer to CONSOLE, FLOOR, INSTALLATION . 6. Remove the blocks from the tires and wheel assemblies. 7. Connect the battery negative cable to its post on the battery. 2012 BRAKES Base - Service Information - Fiat 500