2002 GMC Envoy Owner's Manual - Page 183

2002 GMC Envoy Manual

Page 183 highlights

Rear Window Defogger Do not attach a temporary vehicle license, tape or decals across the defogger grid on the rear window. NOTICE: Do not try to clear frost or other material from the inside of the rear window with a razor blade or anything else that is sharp. This may damage the defogger grid. The repairs wouldn't be covered by your warranty. The lines you see on the rear window warm the glass. Press the button to start warming your window. A light will glow in the button while the defogger is working. If your vehicle is equipped with heated mirrors, this button will activate them. After 10 minutes it will turn off by itself, or press the button during the heating cycle to turn it off. If you need additional warming time, push the button again. 3-9

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