Diagnostic Test

WARNING: This page is about a different car, the 2014 Fiat 500e. However, it is still accessible from the selected car via links, so may be relevant.

TEST FOR INTERMITTENT CONDITION
1. With the scan tool, record and erase the DTCs.
2. Cycle the ignition on to off three times.
3. Turn the ignition on and wait 30 seconds.
4. With the scan tool, read the active 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 STANDARD PROCEDURE .
CHECK THE IMMOBILIZER ANTENNA
1. With the scan tool, erase the DTCs.
2. Turn the ignition off.
3. Remove the Immobilizer Antenna from the ignition switch and disconnect the harness connector.
4. Connect a jumper wire between the (D111) Antenna Signal circuit and the (D931) Antenna Shield circuit in the Immobilizer Antenna harness connector.
5. Cycle the ignition on to off three times.
6. Turn the ignition on and wait 30 seconds.
7. With the scan tool, read the active DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Replace the Immobilizer Antenna.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
CHECK THE (D111) ANTENNA SIGNAL CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Body Control Module (BCM) C3 harness connector.
3. Measure the resistance of the (D111) Antenna Signal circuit between the Immobilizer Antenna harness connector and the Body Control Module C3 harness connector.
  Is the resistance below 2.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the open in the (D111) Antenna Signal circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (D931) ANTENNA SHIELD CIRCUIT FOR AN OPEN
1. Measure the resistance of the (D931) Antenna Shield circuit between the Immobilizer Antenna harness connector and the Body Control Module C3 harness connector.
  Is the resistance below 2.0 Ohms?
  
  Yes
  - Replace 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
  - Repair the open in the (D931) Antenna Shield circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .