Rear Defogger: Description and Operation

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

When the rear defogger switch is pushed, a ground signal is sent to the rear defogger timer The timer provides ground for the rear defogger relay coil and the rear defogger ON indicator light The rear defogger relay energizes and the relay contact closes. Battery voltage is applied to the rear defogger. The indicator lights up 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 starter switch is turned to OFF or if the rear defogger switch is depressed again.