Rear Window Defogger
REAR (Rear Defogger): Press to turn the rear window defogger on or off. The rear window defogger turns off after about 10 minutes. It can also be turned off by turning the ignition to ACC/ACCESSORY or LOCK/OFF. If turned on again, it runs for about five minutes before turning off.
Do not drive the vehicle until all the windows are clear.
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.
See also:
Cargo Cover
For vehicles with a cargo cover, use it to cover items in the rear of the vehicle.
To remove the cover from the vehicle, pull both ends toward each other. To reinstall,
place each end of the cover ...
New for 2011
The Sierra Hybrid gets GM's OnStar 9.0 telematics system that GM says
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Replacement Bulbs
For replacement bulbs not listed here, contact your dealer. ...