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)
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.
CHECK THE SPEED CONTROL SWITCH
NOTE:
Visually inspect the Steering Wheel Wiring Harness, repair as necessary.
1. Turn the ignition off.
2. Disconnect the Speed Control Switch harness connector.
3. Turn the ignition on.
4. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 3
  No
  - Replace the Speed Control Switch in accordance with the Service Information. Refer to SWITCH, SPEED CONTROL, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - ELECTRIC .
CHECK THE CLOCKSPRING
1. Turn the ignition off.
2. Disconnect the Clockspring C1 harness connector.
3. Turn the ignition on.
4. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active with the Clockspring C1 harness connector unplugged?
  
  Yes
  - Go To 4
  No
  - Replace the Clockspring in accordance with the Service Information. Refer to CLOCKSPRING, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - ELECTRIC .
CHECK FOR A SHORT BETWEEN THE (V36) CRUISE CONTROL ON/OFF SWITCH SENSE CIRCUIT AND THE (X920) RADIO/CRUISE/HORN RETURN CIRCUIT
1. Turn the ignition off.
2. Measure the resistance between the (V36) Cruise Control On/Off Switch Sense circuit and the (X920) Radio/Cruise/Horn Return circuit at the Clockspring C1 harness connector.
  Is the resistance above 10K Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the short between the (V36) Cruise Control On/Off Switch Sense circuit and the (X920) Radio/Cruise/Horn Return circuit in the wiring harness.
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - ELECTRIC .
CHECK THE (V36) CRUISE CONTROL ON/OFF SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the (V36) Cruise Control On/Off Switch Sense circuit at the Clockspring C1 harness connector.
  Is the resistance above 10K Ohms?
  
  Yes
  - Replace Body Control Module (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 - ELECTRIC .
  No
  - Repair the (V36) Cruise Control On/Off Switch Sense circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - ELECTRIC .