Rear Window System - Defogger: Operation

The rear window defogger operates when ignition switch is in ON or ACC position. When rear defogger switch is pressed, a momentary ground signal is sent to GEM, which in turn grounds defogger relay. When defogger relay is activated, power from 40-amp maxi-fuse in power distribution box is supplied to rear defogger grid. GEM turns the system on for 10 minutes, then automatically turns power to rear window off.