GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

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

The indicator lamp lights and the rear window warms.

2

Press the rear defogger switch to OFF.

The indicator lamp goes out and the rear window cools.

Rear Window Defogger Always On

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