Cadillac 2002 Seville Owner's Manual page 179

Rear Window Defogger
The grid lines you see on the rear window warm the
glass. When the rear window defogger is turned on, the
rear window and both outside rearview mirrors are heated
to remove snow and ice from the surface of the glass.
Press the button to turn on the rear defogger. The light in
the button will come on while the system is activated.
The rear window defogger
button is located on the
climate control panel near
the bottom left corner.
The system will automatically shut off after 10 minutes.
If further defogging is desired, press the button again.
The system will automatically shut off after five minutes
for any cycles after the initial activation.
NOTICE:
Don't use a razor blade or something else sharp
on the inside of the rear window. If you do, you
could cut or damage the warming grid or the
integrated rear window antenna, and the repairs
wouldn't be covered by your warranty.
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.
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