Inspection and Verification

Daytime Running Lamps (DRL)

Inspection and Verification

1. Verify the customer concern.

2. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

3. NOTE: Make sure to use the latest scan tool software release.

If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).

4. NOTE: The Vehicle Communication Module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.

If the scan tool does not communicate with the VCM:

- check the VCM connection to the vehicle.

- check the scan tool connection to the VCM.

- refer to Module Communications Network Testing and Inspection, No Power To The Scan Tool, to diagnose no power to the scan tool.

5. If the scan tool does not communicate with the vehicle:
- verify the ignition is on.
- The air bag warning indicator prove-out confirms ignition on (other indicators may not prove ignition on). If the ignition does not turn on, refer to Steering Column Switches Testing and Inspection to diagnose no power in run.

- verify the scan tool operation with a known good vehicle.

- refer to Module Communications Network Testing and Inspection, The PCM Does Not Respond To The Scan Tool, to diagnose no response from the PCM.

6. Check the operation of the PRNDL display by placing the gear selector lever in each of its positions.
- If the PRNDL display does not operate correctly, refer to Instrumentation, Message Center, and Warning Chimes Testing and Inspection.

7. If the DTCs retrieved are related to the concern, refer to Diagnostic Trouble Code (DTC) Chart Testing and Inspection. For all other DTCs, refer to the Diagnostic Trouble Code (DTC) Chart in Multifunction Electronic Modules Multifunction Electronic Modules.

8. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Symptom Related Diagnostic Procedures