Schematic Reference: Fog Lights Schematics

Connector End View Reference: Lighting Systems Connector End Views or Data Communication Connector End Views

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

Verify that the rear fog lamps are inoperative.

Do the rear fog lamps operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

Test the inoperative bulb for an open or poor terminal contact and replace as necessary. Refer to Circuit Testing or Tail Lamp Bulb Replacement .

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 AUTO.

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 .

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 underhood fuse block. Refer to Circuit Testing .

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 .

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 .

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 .

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 .

Did you find and correct the condition?

Go to Step 15

Go to Step 12

Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 15

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Replace the rear fog lamp relay. Refer to Relay Replacement .

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