GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn the ignition switch to the ON position.
  2. Press the rear window defogger switch.

The rear window defogger and the LH and RH outside rear view mirrors warm up and defrost.

The rear window defogger and the outside rear view mirrors are inoperative. Go to Rear Window Defogger Inoperative for diagnosis.

2

  1. Turn the ignition switch to the ON position.
  2. Press the rear window defogger switch.

The rear window defogger and the LH and RH outside rear view mirrors warm up and defrost.

The rear window defogger operates normally but the heated mirrors do not operate properly. Refer to Heated Mirrors Inoperative for diagnosis.

3

  1. Turn the ignition switch to the ON position.
  2. Press the rear window defogger switch.

The rear window defogger and the LH and RH outside rear view mirrors warm up and defrost.

The RH heated mirror operates properly but the LH mirror does not operate properly. Refer to Heated Mirrors Inoperative for diagnosis.

4

  1. Turn the ignition switch to the ON position.
  2. Press the rear window defogger switch.

The rear window defogger and the LH and RH outside rear view mirrors warm up and defrost.

The LH heated mirror operates properly but the RH mirror does not operate properly. Refer to Heated Mirrors Inoperative for diagnosis.

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