Schematic Reference: Fog Lights Schematics

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

Verify that the rear fog lamp is inoperative.

Does the rear fog lamp operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

Inspect the inoperative bulb and socket for an open filament or poor terminal contact and replace or repair as necessary.

Did you find and correct a condition?

Go to Step 15

Go to Step 4

With the engine Off, turn the key to RUN and the headlamp switch to PARK.

Do the park lamps illuminate?

Go to Step 5

Go to Symptoms - Lighting Systems

Inspect the RR FOG fuse.

Is the fuse open?

Go to Step 6

Go to Step 7

Test for a short to ground in the rear 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 15

Go to Step 13

1. Place the rear fog lamp switch in the ON position.
2. Remove the rear fog lamp relay.
3. Test for a ground signal at the rear fog lamp relay control circuit terminal in the body relay block. Refer to Circuit Testing in Wiring Systems.

Was a ground signal present?

Go to Step 10

Go to Step 8

Test the rear fog lamp switch signal and ground circuits for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct a condition?

Go to Step 15

Go to Step 9

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 rear fog lamp relay control circuit terminal in the body relay block. Refer to Circuit Testing in Wiring Systems.

Was a ground signal present?

Go to Step 14

Go to Step 11

Test for an open or high resistance in the rear fog lamp supply voltage circuit and the ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct a condition?

Go to Step 15

Go to Step 13

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 15

Go to Step 12

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 15

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Replace the rear fog lamp relay. Refer to Fog Lamp Relay Replacement in Wiring Systems.

Did you complete the repair?

Go to Step 15

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Replace the rear fog lamp switch. Refer to Headlamp Switch Replacement .

Did you complete the repair?

Go to Step 15

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3