1999 Pontiac Bonneville Owner's Manual - Page 155

First Edition for Pontiac Bonneville Owner's Manual - 1999 yellowblue Rear Window Defogger 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. The system will then operate for five minutes before going off by itself. Do not attach a temporary vehicle license, tape or decals across the defogger grid on the rear window. H-23-4004-R H-23-0007-T 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. If you have the standard system, a light will glow in the switch while the defogger is working. 3-9