GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Ensure that the ambient light sensor receives a sufficient amount of light, use a trouble light if necessary
  2. Turn the headlamp switch to the PARK position.
  1. Park and side marker lamps light.
  2. Tail lamps light.
  3. License lamps light.

2

  1. Depress the brake pedal.
  2. Release the brake pedal.
  1. Stop lamps and the high mounted stop lamp light when the brake pedal is depressed.
  2. Stop lamps and the high mounted stop lamp turn OFF when the brake pedal is released.
    •  Stop Lamps Inoperative

3

Depress the hazard lamp switch.

Front and rear hazard lamps flash.

Hazard Lamps Inoperative

4

  1. Ensure that the ambient light sensor receives a sufficient amount of light, use a trouble light if necessary
  2. Turn the ignition switch to the ON position. Do not start the engine.
  3. Position the turn signal lever to the LH turn position.
  4. Position the turn signal lever to the RH turn position.
  1. DRL head lamps illuminate.
  2. LH turn signals and indicator flash while in the LH turn position.
  3. RH turn signals and indicator flash while in the RH turn position.

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