Inspection and Verification

INSPECTION AND VERIFICATION

1. Verify the customer concern by operating the headlamps.

Visual Inspection Chart:

2. Visually inspect for obvious signs of mechanical and electrical damage; refer to the chart.
3. If the inspection reveals obvious concern(s) that can be readily identified, repair as necessary.
4. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
- check that the program card is correctly installed.
- check the connections to the vehicle.
- check the ignition switch position.

5. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool manual.

NOTE: Make sure the headlamp switch is in the OFF position and the multifunction switch is in the low beam position before carrying out diagnostic tests.

6. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
- SCP or ISO circuit fault; all electronic control units no response/not equipped, refer to Information Bus (Module Communications Network).
- No response/not equipped for lighting control module (LCM), refer to Body Control Systems (Multifunction Electronic Control Module).
- System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the self-test diagnostics for the LCM.

7. If the DTCs retrieved are related to the concern, go to the LCM Diagnostic Trouble Code (DTC) Index to continue diagnostics. Headlamps
8. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics. Headlmaps