1996 Buick Park Avenue Owner's Manual - Page 150

Rear Window Defogger (Option) E The lines you see on the rear window warm the glass. Press this buttonto start warming your window. Do not attach a temporaryvehicle license, tape or decals across the defoggergrid on the rear window. I NOTICE: Don't use a razor blade or something else sharp If on the insideof the rear window. you do, you could cut or damage the warming grid, and the repairs wouldn't be covered by your warranty. After 10 minutes it will turn off by itself, or by pressing the button during the heatingcycle will turn it off. If you need additional warming time, push the button again. The system will then operate for fiveminutes before going off by itself. 3-10