GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Engage the parking brake.
  2. Start the engine.
  1. Headlamps stay OFF.
  2. Brake indicator light illuminates.

Headlamps, Daytime Running Lamps (DRL) On With Park Brake Applied

2

Disengage the parking brake.

  1. Brake indicator goes out.
  2. Low beam headlights illuminate at 80%.

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

3

Turn the light switch to the HEAD position.

    • Low beams illuminate to full intensity.
    • All park lights illuminate.

Headlamps Do Not Switch Intensity

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