GM Service Manual Online
For 1990-2009 cars only

Rear Window Defogger

The rear window defogger uses a warming grid to remove fog or frost from the rear window.

The rear window defogger will only work when the ignition is in RUN.


Object Number: 811239  Size: A3

Press this button to turn the rear window defogger on or off. Be sure to clear as much snow from the window as possible.

The rear window defogger will turn off several minutes after the button is pressed. If turned on again, the defogger will run for several more minutes before turning off. The defogger can also be turned off by pressing the button again or by turning off the engine.

Notice: Do not use a razor blade or sharp object to clear the inside rear window. Do not adhere anything to the defogger grid lines in the rear glass. These actions may damage the rear defogger. Repairs would not be covered by your warranty.

Outlet Adjustment


Object Number: 811240  Size: B3

Move the thumbwheel in the center of the outlets up or down to change the direction of airflow.

Operation Tips

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  • Clear away any ice, snow or leaves from the air inlets at the base of the windshield that may block the flow of air into your vehicle.
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  • Use of non-GM approved hood deflectors may adversely affect the performance of the system.
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  • Keep the path under the front seats clear of objects to help circulate the air inside of your vehicle more effectively.