Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. 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, 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 VERIFICATION TEST .
CHECK THE LEFT SIDE MARKER LAMP
1. Turn the Park Lamps off.
2. Turn the ignition off.
3. Disconnect the Left Daytime Running Lamp harness connector.
4. Turn the ignition on.
5. Turn the Park Lamps on.
6. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 3
  No
  - Replace the Left Side Marker Lamp in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE RIGHT SIDE MARKER LAMP
1. Turn the Park Lamps off.
2. Turn the ignition off.
3. Disconnect the Right Daytime Running Lamp harness connector.
4. Turn the ignition on.
5. Turn the Park Lamps on.
6. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 4
  No
  - Replace the Right Side Marker Lamp in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (L145) SIDE MARKER LAMP CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Disconnect the BCM C4 harness connector.
2. Measure the resistance between ground and the (L145) Side Marker Lamp Control circuit.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the short to ground in the (L145) Side Marker Lamp Control circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the BCM in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .