1995 Buick Roadmaster Owner's Manual - Page 127

Rear Window Defogger (Option) The lines you see on the rear window warmthe glass. Pressthe button to start warming your window. After 10 minutes, it will go off by itself or pressing the button again during the heating cycle will shut it Off. If you need additional wanning tirne, press the button again. If you have the heated outside rearview mirrors option, the mirrors will bewarmed when the rear defogger is on. Do not attach anything a temporary vehicle license like or decal across the defogger grid the rear window. on NOTICE: Don't use a razor blade or something else sharp on the inside the rear window. you do, you of If could cut or damage the warming grid, and the repairs wouldn't be covered by your warranty. 3-3