Heated Glass Element: Description and Operation

Voltage is applied at all times through fuse C-17 to the rear defogger relay. With the ignition switch in ON or START, voltage is applied through fuse C-4 to the rear defogger switch and the rear defogger relay coil.

When you push the rear defogger switch, a ground signal is sent to the rear defogger timer. The timer provides ground for the rear defogger relay coil and the defogger "ON" indicator light. The rear defogger relay energizes and the relay contact closes, applying battery voltage to the rear defogger. The indicator light comes ON and the rear defogger heats the rear window to remove any fog from the glass. The rear defogger will turn OFF automatically after approximately 30 minutes. It will also turn OFF if the ignition switch is turned to OFF or if the rear defogger switch is pressed again.