Headlamps

HEADLAMPS

Inspection and Verification

1. Verify the customer concern.

2. Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart





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


NOTE: Make sure the main light switch is in the OFF position.

NOTE: Make sure the multifunction switch is in the LOW BEAM position.

4. If the cause is not visually evident, connect the scan tool to the data link connector (DLC).


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

5. 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.
- See Pinpoint Test 1: The PCM Does Not Respond To The Scan Tool Or No High Speed Controller Area Network (HS-CAN) Communication.


NOTE: The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.

6. If the scan tool does not communicate with the vehicle:

- Verify the ignition key is in the ON position.
- Verify the scan tool operation with a known good vehicle.
- See Pinpoint Test 1: The PCM Does Not Respond To The Scan Tool Or No High Speed Controller Area Network (HS-CAN) Communication, to diagnose no response from the PCM.

7. Carry out the network test.

- If the scan tool responds with no communication for one or more modules, see Communications Network.
- If the network test passes, retrieve and record the continuous memory DTCs.

8. Clear the continuous DTCs and carry out the self-test diagnostics for the smart junction box (SJB).

9. If the DTCs retrieved are related to the concern, go to the Smart Junction Box (SJB) DTC Chart. Headlamps - DTC Chart For all other DTCs, see - Diagnostic Trouble Code (DTC) Chart - B, C, P And U Codes.

10. If no DTCs related to the concern are retrieved, see - Symptom Troubleshooting Chart - Headlamps.