GM Service Manual Online
For 1990-2009 cars only

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 fog lamp indicator is always on.

Does the fog lamp indicator operate normally?

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

Go to Step 3

3

Are the fog lamps always on?

Go to Symptoms - Lighting Systems

Go to Step 4

4

Test the fog lamp switch ground circuit for an open or high resistance. Refer to Circuit Testing in Wiring Systems.

Was a problem found?

Go to Step 5

Go to Step 6

5

Repair the open or high resistance in the fog lamp switch ground circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 7

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6

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

Did you complete the repair?

Go to Step 7

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7

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3