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Fog Lamps Inoperative

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.
Fog Lamps Inoperative

Step Action Yes No
Schematic Reference:  Fog Lights 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 front fog lamps are inoperative.
Do the front fog lamps operate normally?		 TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS in Wiring Systems Go to Step 3 
3 Is only one front fog lamp inoperative? Go to Step 4  Go to Step 5 
4
  1. Inspect the inoperative bulb and socket for an open filament or poor terminal contact and replace as necessary.
  2. If no problem is found, locate and repair the open or high resistance in the front fog lamp 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 16  -
5 With the engine Off, turn the key to RUN and the headlamp switch to PARK.
Do the park lamps illuminate?		 Go to Step 6  Go to Symptoms - Lighting Systems 
6 Inspect the FOG LP fuse.
Is the fuse open?		 Go to Step 7  Go to Step 8 
7 Test for a short to ground in the front fog lamp supply voltage circuit. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Did you find and correct a condition?		 Go to Step 16  Go to Step 14 
8
  1. Place the front fog lamp switch in the ON position.
  2. Remove the front fog lamp relay.
  3. Test for a ground signal at the front fog lamp relay control circuit terminal in the underhood fuse block. Refer to CIRCUIT TESTING in Wiring Systems.
Was a ground signal present?		 Go to Step 11  Go to Step 9 
9 Test the front fog lamp 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 16  Go to Step 10 
10
  1. Remove the fog lamp switch.
  2. Place a fused jumper between the fog lamp switch signal and ground connector terminals.
  3. Test for a ground signal at the front fog lamp relay control circuit terminal in the underhood fuse block. Refer to CIRCUIT TESTING in Wiring Systems.
Was a ground signal present?		 Go to Step 15  Go to Step 12 
11 Test for an open or high resistance in the front fog lamp supply voltage circuit. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Did you find and correct a condition?		 Go to Step 16  Go to Step 14 
12 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 16  Go to Step 13 
13
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 16  -
14 Replace the front fog lamp relay. Refer to Fog Lamp Relay Replacement (RPO T96) Fog Lamp Relay Replacement (RPO T79) .
Did you complete the repair?		 Go to Step 16  -
15 Replace the front fog lamp switch. Refer to Headlamp Switch Replacement .
Did you complete the repair?		 Go to Step 16  -
16 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 3 
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