GM Service Manual Online
For 1990-2009 cars only

Fog Lights System Check Front

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

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

Both front fog lamps and the fog lamp indicator are off.

Fog Lamps Always On

2

  1. Turn the ignition switch to the RUN position.
  2. Place the front fog lamp switch to the ON position.

Both front fog lamps light. The fog lamp indicator lights. All park lamps light.

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

Fog Lights System Check Rear

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

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

Both rear fog lamps and the fog lamp indicator are off.

Rear Fog Lamps Always On

2

  1. Place the headlamp switch in the ON position.
  2. Place the rear fog lamp switch to the ON position.

The headlamps and park lamps light. Both rear fog lamps light. The fog lamp indicator lights.

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