Initial Inspection and Diagnostic Overview

Inspection and Verification

1. Verify the customer concern.




2. Visually inspect the given chart for obvious signs of mechanical or electrical damage.
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 headlamp switch is in the OFF position.
- Make sure the multifunction switch is in the LOW BEAM position.

4. If the cause is not visually evident, connect the WDS or equivalent tester to the data link connector (DLC) and select the vehicle to be tested from the WDS or equivalent tester menu. If the WDS or equivalent tester 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 WDS or equivalent tester still does not communicate with the vehicle, refer to the WDS or equivalent tester operating manual.
6. Carry out the WDS or equivalent tester data link test. If the WDS or equivalent tester responds with:
- ISO circuit fault; all electronic control units no response/not equipped, see COMMUNICATIONS NETWORK.
- No response/not equipped for SJB, see MODULE CONTROLLED FUNCTIONS.
- System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the self-test diagnostics for the SJB.

7. If the DTCs retrieved are related to the concern, see SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX. Headlamp
8. If no DTCs related to the concern are retrieved, see SYMPTOM TROUBLESHOOTING CHART-HEADLAMPS. Symptom Related Diagnostic Procedures