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 INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all DTCs.
3. Turn on and off the Front Wiper.
4. 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 - EXCEPT ELECTRIC .
CHECK THE (W3) FRONT WIPER LOW SPEED DRIVER CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS
1. Turn the ignition off.
2. Disconnect the Front Wiper Motor harness connector.
3. Disconnect the BCM C4 harness connector.
4. Turn the ignition on.
5. Measure the voltage between ground and the (W3) Front Wiper Low Speed Driver circuit.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (W3) Front Wiper Low Speed Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - EXCEPT ELECTRIC .
  No
  - Go To 3
CHECK THE BCM FOR CORRECT OPERATION
1. Turn the ignition off.
2. Reconnect the BCM C4 harness connector.
3. Connect a 12-volt test light between the (W3) Front Wiper Low Speed Driver circuit and the (Z910) Ground circuit at the Front Wiper Motor harness connector.
4. Turn the ignition on.
5. Turn the Front Wiper on and off.
  Does the test light illuminate correctly as the Front Wiper is commanded on and off?
  
  Yes
  - Replace the Front Wiper Motor in accordance with the Service Information. Refer to MOTOR, WIPER, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - EXCEPT ELECTRIC .
  No
  - Replace the BCM in accordance with the Service Information. Refer to MODULE, BODY CONTROL, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - EXCEPT ELECTRIC .