Durango RT 4WD V8-5.9L VIN Z LDC (2002)
Heated Glass Element Switch: Description and Operation
The rear window defogger switch is integral to the heater-A/C control assembly, which includes the rear wiper and washer switches.
The rear window switch also contains the rear window defogger logic and timer circuitry, an amber defogger indicator LED, the rear window defogger
relay, and two switch illumination lamps. The illumination lamps in the switch pod use incandescent bulbs, which can be serviced. The rear window
defogger indicator is a LED in the HVAC control and can not be serviced.
The momentary-type rear window defogger switch provides a hard wired ground signal to the rear window defogger logic and timer circuitry each time it
is depressed.
The rear window defogger timer and logic circuitry responds by energizing or de-energizing the rear window defogger relay and the amber defogger
indicator lamp, which lights to indicate when the defogger system is turned ON. Energizing the rear window defogger relay provides electrical current to
the rear window defogger grid.
The rear window switch cannot be repaired. If any function of the switch is faulty or damaged, the entire heater-A/C control assembly must be replaced.
