1998 Cadillac Seville Owner's Manual - Page 158

Rear Window Defogger The grid lines you see on the rear window warm the glass. Press this button to turn on the rear defogger. With it, the rear window and both outside rearview mirrors are heated. Note that the lines along the top of the window are for the diversity antenna and are not intended to defog the rear window. Do not attach a temporary vehicle license, tape or decals across the defogger grid on the rear window. I NOTICE: Scraping the inside your rear window could of cut and damage the heating grids. Your warranty would not cover this damage. Don't put decals there because you might have scrape themoff. to The system will automatically shut off after ten minutes. If further defogging is desired, press the button again. The system will automatically shut off after five minutes for any activations after the first one. 3-7