GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Ensure headlamp switch is in the OFF position.
  2. Ensure park brake is disengaged.
  3. Turn ignition switch to the ON position.
  1. DRL indicator illuminates
  2. LOW beam headlamps illuminate.
  3. Park and tail lamps remain OFF.

2

  1. Turn headlamp switch to the ON position.
  2. Alternate dimmer switch between HIGH and LOW beam positions.
  1. DRL indicator turns OFF.
  2. Headlamps alternate between HIGH and LOW beams.
  3. Park and tail lamps illuminate.
  4. High beam indicator illuminates in the high beam position.

3

  1. Turn the headlamp switch to the OFF position.
  2. Engage the parking brake.
  1. Headlamps turn OFF.
  2. DRL headlamps turn OFF.
  3. DRL indicator turns OFF

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