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 DTC
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Wait 30 seconds.
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 FUSED RUN RELAY OUTPUT CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Power Top Control Module harness connector.
3. Turn the ignition on.
4. Using a 12-volt test light connected to ground, check the Fused Run Relay Output circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3
  No
  - Repair the open or short to ground in the Fused Run Relay Output circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - EXCEPT ELECTRIC .
CHECK THE GROUND CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Using a 12-volt test light connected to 12-volts, check the Ground circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the open in the Ground circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - EXCEPT ELECTRIC .
CHECK THE (D401) BCM LIN 1 BUS CIRCUIT FOR AN OPEN
1. Turn the ignition on.
2. Measure the voltage between ground and the (D401) BCM LIN 1 Bus circuit.
  Is the voltage above 5.0 volts?
  
  Yes
  - Replace the Power Top Control Module in accordance with the Service Information. Refer to MODULE, POWER TOP CONTROL, FULL OPEN RETRACTABLE ROOF, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - EXCEPT ELECTRIC .
  No
  - Repair the open in the (D401) BCM LIN 1 Bus circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - EXCEPT ELECTRIC .