GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Was the Lighting System Diagnostic System Check performed?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

With the fog lamps turned on, test for positive battery voltage at terminal B of the fog lamp that is not working.

Is battery voltage present?

Go to Step 3

Go to Step 4

3

Test terminal A of the fog lamp for continuity to ground.

Is ground present?

Go to Step 5

Go to Step 6

4

Repair the open in the Fog Lamp Feed Circuit.

Is the repair complete?

System OK

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5

Replace the fog lamp bulb.

Is the repair complete?

System OK

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6

Repair the open in the Ground Circuit.

Is the repair complete?

System OK

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