Inspection and Verification (Start Testing Here)

1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of mechanical and electrical damage.

VISUAL INSPECTION CHART

Mechanical
^ Damaged headlamp switch

Electrical
^ Blown Central Junction Box (CJB) fuse(s):
- Fuse 4 (15 A)
- Fuse 6 (15 A)
- Fuse 8 (15 A)
- Fuse 13 (15 A)
- Circuit Breaker 12 (18 A)
^ Blown Battery Junction Box (BJB) HI-BEAM HEADLIGHTS (20 A) fuse
^ Damaged wiring harness
^ Headlamp bulb
^ Damaged LCM
^ Loose or corroded connection
^ Damaged headlamp switch

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the concern remains after the inspection, connect the New Generation STAR (NGS) Tester to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the NGS menu. If the NGS does not communicate with the vehicle:
^ check the program card is properly installed.
^ check the connections to the vehicle.
^ check the ignition switch position.
5. If the NGS still does not communicate with the vehicle, refer to NGS Tester manual.
6. Carry out the DATA LINK DIAGNOSTIC TEST. If the NGS responds with:
^ CKT914, CKT915 or CKT7O = ALL ECUS NO RESP/NOT EQUIP, refer to Information Bus.
^ NO RESP/NOT EQUIP for Lighting Control Module (LCM), go to Pinpoint Test A. A No Communication With the Lighting Control Module
^ SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the LCM.
7. If the DTCs retrieved are related to the concern, go to the LCM Diagnostic Trouble Code Index to continue diagnostics. LCM Diagnostic Trouble Code Index
8. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics. Symptom Chart(s)