GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Place headlamp switch in the PARK position.
  2. Depress the top portion of the fog lamp switch.
  1. Park lamps light.
  2. Fog lamps light.
  3. Fog lamp switch indicator lights.

2

  1. Place the headlamp switch in the headlamp position.
  2. Alternate the headlamp dimmer switch between the HIGH and LOW beam positions.
  1. Headlamps light and alternate between the HIGH and LOW beams.
  2. Fog lamps light in the LOW beam position and turn off in the HIGH beam position.
    •  Fog Lamps Always On

3

  1. Depress the bottom portion of the fog lamp switch.
  2. Turn the headlamp switch OFF.
  1. Fog lamps turn OFF.
  2. Fog lamp indicator turns OFF.
  3. Headlamps and park lamps turn OFF.

Fog Lamps Always On

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