GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Place the ignition switch in the RUN position.
  2. Press the rear defogger switch once and release.
  1. Switch returns to the reset position.
  2. Rear window defogger switch indicator turns on.
  3. After approximately 10 minutes the defogger switches to the off position.
  1. Rear Window Defogger Inoperative
  2. Defogger Lamp Switch Inoperative - Rear Window

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