Diagnostic Test

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)
NOTE:
A disconnected sensor will set this DTC. Verify the Park Assist Sensor is connected before proceeding with this diagnostic procedure.
1. Turn the ignition on.
2. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2
  No
  - 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.
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - ELECTRIC .
CHECK THE VOLTAGE OF THE PARK ASSIST SENSOR SUPPLY CIRCUIT
1. Turn the ignition off.
2. Disconnect the Park Assist Sensor.
3. Turn the ignition on.
4. Measure the voltage of the Park Assist Sensor Supply circuit.
  Is the voltage above 8.0 volts?
  
  Yes
  - Go To 4
  No
  - Go To 3
CHECK THE PARK ASSIST SENSOR SUPPLY CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the Park Assist Module C2 harness connector.
3. Measure the resistance of the Park Assist Sensor Supply circuit.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Replace the Park Assist Module in accordance with the Service Information. Refer to MODULE, PARK ASSIST, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - ELECTRIC .
  No
  - Repair the open or high resistance in the Park Assist Sensor Supply circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - ELECTRIC .
CHECK THE REAR INNER LEFT SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Disconnect the Park Assist Module C2 harness connector.
2. Measure the resistance between ground and the Rear Inner Left Sensor Signal circuit.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the short to ground in the Rear Inner Left Sensor Signal circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - ELECTRIC .
  No
  - Go To 5
CHECK THE REAR INNER LEFT SENSOR SIGNAL CIRCUIT FOR AN OPEN
1. Measure the resistance of the Rear Inner Left Sensor Signal circuit.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the open in the Rear Inner Left Sensor Signal circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - ELECTRIC .
  No
  - Go To 6
PARK ASSIST SENSOR
1. Turn the ignition on.
2. Reconnect the Park Assist Module C2 harness connector.
3. Connect a jumper wire across the Park Assist Sensor Supply and Rear Inner Left Sensor Signal circuits.
4. Turn the ignition on.
5. With the scan tool, read DTCs.
  Does the scan tool display DTC: C100C-12-REAR INNER LEFT SENSOR SHORT TO BATTERY as active?
  
  Yes
  - Replace the Park Assist Sensor in accordance with the Service Information. Refer to SENSOR, PARK ASSIST, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - ELECTRIC .
  No
  - Replace the Park Assist Module in accordance with the Service Information. Refer to MODULE, PARK ASSIST, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - ELECTRIC .