GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn the ignition switch to the OFF position.
  2. Place the headlamp switch in the OFF position.
  3. Place the fog lamp switch in the OFF position.

All of the exterior lamps, including the fog lamps, are off.

Fog Lamps Always On

2

  1. Place the headlamp switch in the ON position.
  2. Place the fog lamp switch in the ON position.
  1. All of the park lamps turn on.
  2. Both of the fog lamps turn on.
  3. The fog lamp ON indicator lights.

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.