Grand Cherokee 2WD L6-4.0L VIN S (1997)
Heated Glass Element Switch: Description and Operation
SYSTEM OPERATION
The rear window defogger switch is mounted in the inboard instrument panel switch pod, inboard of the steering column. The momentary-type
switch provides a hard-wired ground signal to the Body Control Module (BCM) each time it is depressed. The BCM 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 and the Light-Emitting Diode (LED) in the
switch, which lights to indicate that the defogger system is turned on. The defogger switch and LED cannot be repaired. If faulty, the inboard
switch pod unit must be replaced.
