Heated Glass Element: Description and Operation
Rear Window DefoggerHow the Circuit Works
Battery voltage is supplied at all times through fuse 14 to the rear window defogger relay contacts. With the ignition switch in ON (II), battery voltage is supplied through fuse 30 to the rear window defogger relay coil and through fuse 32 to the display panel control unit.
When the rear window defogger switch (in the front passenger's climate control switch assembly) is pressed, a signal for rear defog is input to the display panel control unit. The display panel control unit communicates that info via a multiplexed signal to the relay control module. The relay control module provides ground for the rear window defogger relay coil, which energizes the relay. Battery voltage is supplied to rear window defogger through the energized relay.
The rear window defogger is turned off by pressing the rear window defogger switch a second time or by turning the ignition switch to LOCK (0).