2011 Cadillac DTS Owner's Manual - Page 195

Rear Window Defogger The rear window defogger uses a warming grid to remove fog or frost from the rear window. Sensors < (Rear Defogger): Press to turn the rear window defogger on or off. Be sure to clear as much snow from the rear window as possible. The rear window defogger will turn off approximately 20 minutes after the button is pressed if the vehicle is moving at slower vehicle speeds. At higher vehicle speeds, the rear defogger may stay on continuously. Each additional press will run the defogger for approximately 10 minutes. The heated outside rearview mirrors will turn on to help clear fog or frost from the surface of the mirror when the rear window defogger is on. Notice: Do not use a razor blade or sharp object to clear the inside rear window. Do not adhere anything to the defogger grid lines in the rear glass. These actions may damage the rear defogger. Repairs would not be covered by your warranty. The solar sensor, located in the defrost grille, middle of the instrument panel, monitors the solar radiation. Do not cover the solar sensor or the system will not work properly. 4-37