Heated Glass Element Switch: Description and Operation

SYSTEM OPERATION
The rear window defogger switch is mounted in the accessory switch bezel, which is located in the lower instrument panel center bezel. The momentary-type switch provides a hard-wired ground signal to the instrument cluster each time it is depressed. The instrument cluster rear window defogger timer and logic circuitry responds by energizing or de-energizing the rear window defogger relay.

Energizing the rear window defogger relay provides electrical current to the rear window defogger grid, the heated outside rear view mirror grids, and the amber indicator lamp in the switch, which lights to indicate when the defogger system is turned On. The defogger illumination lamp and indicator lamp bulbs are serviceable. The defogger switch cannot be repaired and, if faulty, it must be replaced.