K 3500 Truck 4WD V8-5.7L VIN R (1998)
Heated Glass Element: Description and Operation
Defogger
With the Ignition Switch in RUN, voltage is supplied to the Rear Defogger Switch at the Heater/HVAC Control Module. When the Rear Defogger
Switch is pressed, the contact closes, which provides voltage to the LED Indicator and the Rear Defogger Grid. The Rear Windows will heat to remove
fog from the surface of the window.
The Solid State Time Delay will automatically turn-off the Defogger Grids and the LED at the end of approximately 10 minutes. The Defogger Grids
are also automatically turned off if the Rear Defogger Switch is pressed again or the Ignition Switch is turned to the OFF position.
For the Suburban/Utility with Cargo Doors, the Defogger Grids can be energized only with the Cargo Doors closed.
