GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

Turn the headlamp switch to the PARK position.

    â€¢ Park and side marker lamps light.
    â€¢ Tail lamps light.
    â€¢ License lamps light.
    â€¢ Clearance lamps light (if equipped).
    â€¢ Roof marker lamps light (if equipped).
    â€¢ Endgate identification lamps light (if equipped).
    â€¢  Clearance Lamps Inoperative
    â€¢  License Lamps Inoperative
    â€¢  License Lamps Inoperative
    â€¢  Marker Lamps Inoperative

2

  1. Depress the brake pedal.
  2. Release the brake pedal.
    â€¢ Stoplamps and the CHMSL light when the brake pedal is depressed.
    â€¢ Stoplamps and the CHMSL turn OFF when the brake pedal is released.
    â€¢  Stop Lamps Inoperative
    â€¢  Stop Lamps Inoperative
    â€¢  Stop Lamps Always On
    â€¢  Stop Lamps Always On

3

Depress the hazard lamp switch.

Front and rear hazard lamps flash.

Hazard Lamps Inoperative

4

  1. Turn the ignition switch to the ON position.
  2. Position the turn signal lever to the LH turn position.
  3. Position the turn signal lever to the RH turn position.
    â€¢ LH turn signals and indicator flash while in the LH turn position.
    â€¢ RH turn signals and indicator flash while in the RH turn position.

5

Place the spotlamp switch in the ON position (if equipped).

The spotlamp lights.

Spot Lamp Inoperative

6

Open the vehicles hood.

The underhood lamp lights.

Underhood Lamp Inoperative

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