Defogger System Check. Buick GL7 (Export) 2000

For 1990-2009 cars

Step | Action | Normal Result(s) | Abnormal Result(s)*
--- | --- | --- | ---

1

1. Turn the ignition switch off.
2. Turn the ignition switch on.

• | Defogger ON indicator is off.

• | Defoggers are off.

Defoggers and Heated Mirrors Always On

2

1. Press and release the defogger switch one time.
2. Wait approximately 11 minutes.

• | Defogger ON indicator comes on.

• | Defoggers come on.

• | After approximately 10 minutes, both the defogger ON indicator and the defoggers turn off.

• | Defogger Indicator Inoperative

• | Rear Window Defogger Inoperative

• | Defoggers and Heated Mirrors Always On

3

1. Press and release the Defogger switch one time.
2. Wait approximately 6 minutes.

• | Defogger ON indicator comes on.

• | Defoggers come on.

• | After approximately 5 minutes, both the defogger ON indicator and the defoggers turn off.

• | Defogger Indicator Inoperative

• | Rear Window Defogger Inoperative

• | Defoggers and Heated Mirrors Always On

4

1. Press and release the defogger switch one time.
2. Wait approximately 15 seconds.
3. Press and release the defogger switch a second time, before time-out occurs.

• | Defogger ON indicator comes on and the defoggers come on.

• | When switch is pressed the second time, both the defogger ON indicator and the defoggers turn off immediately.

• | Defogger Indicator Inoperative

• | Rear Window Defogger Inoperative

• | Defoggers and Heated Mirrors Always On

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