GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn the headlamp switch to the HEAD position.
  2. Turn the headlamp dimmer switch to the LOW position.
  1. The low beam headlamps are ON.
  2. The high beam headlamps are OFF.

Headlamps Inoperative - Low Beams

2

Turn the headlamp switch to the HIGH position.

  1. The high beam headlamps are ON.
  2. The high beam indicator is ON.
  3. The low beam headlamps are OFF.

Headlamps Inoperative - High Beams

3

  1. Turn the headlamp switch OFF.
  2. Turn the ignition to ON.
  3. Disengage the parking brake.

The high beam headlamps come ON at a reduced intensity in approximately 30 seconds.

Daytime Running Lamps (DRL) Inoperative, Headlamp Switch Operates Normally

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