Headlamps Inoperative - High Beams

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics
1	Did you perform the Lighting Systems Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Lighting Systems
2	Verify that the high beam headlamps are inoperative. Do the high beam headlamps operate normally?	Go to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS in Wiring Systems	Go to Step 3
3	Is only one high beam headlamp inoperative?	Go to Step 4	Go to Step 5
4	Inspect the inoperative bulb for an open filament and connector for poor terminal contact and replace/repair as necessary. Refer to Headlamp Bulb Replacement or WIRING REPAIRS in Wiring Systems. If no problem is found, repair the open, high resistance or short to ground in the high beam headlamp supply voltage circuit or ground circuit to the inoperative lamp. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems. Did you complete the repair?	Go to Step 13	-
5	Test the headlamp dimmer switch signal and ground circuits for an open or high resistance. Refer toCIRCUIT TESTING and WIRING REPAIRS in Wiring Systems. Did you find and correct a condition?	Go to Step 13	Go to Step 6
6	Place the headlamp switch in the HEAD position. Connect a fused jumper from ground to the headlamp dimmer switch signal terminal of the headlamp dimmer switch connector. Do the high beam headlamps illuminate?	Go to Step 8	Go to Step 7
7	Connect a fused jumper from ground to the high beam headlamp relay control circuit terminal at the high beam headlamp relay in the underhood fuse block. Do the high beam headlamps illuminate?	Go to Step 9	Go to Step 11
8	Inspect for poor connections at the harness connector of the headlamp dimmer switch. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems. Did you find and correct the condition?	Go to Step 13	Go to Step 12
9	Inspect for poor connections at the harness connector of the Body Control Module (BCM). Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems. Did you find and correct the condition?	Go to Step 13	Go to Step 10
10	IMPORTANT: Perform the setup procedure for the BCM. Replace the body control module (BCM). Refer to BODY CONTROL MODULE REPLACEMENT in Body Control System.Did you complete the replacement?	Go to Step 13	-
11	Replace the high beam headlamp relay. Refer to High Beam Relay Replacement . Did you complete the repair?	Go to Step 13	-
12	Replace the headlamp dimmer switch. Refer to MULTIFUNCTION, TURN SIGNAL & HAZARD SWITCH in Steering Wheel and Column. Did you complete the repair?	Go to Step 13	-
13	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3