Envoy 4WD V8-5.3L VIN P (2004)
Heated Glass Element: Description and Operation
REAR WINDOW DEFOGGER DESCRIPTION AND OPERATION
REAR WINDOW DEFOGGER SYSTEM COMPONENTS
The rear window defogger system consist of the following components:
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HVAC control module
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Liftgate module (LGM)
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Rear window defogger grid
REAR WINDOW DEFOGGER OPERATION
Battery positive voltage is supplied through the LGM 2 fuse to the LGM for the rear window defogger system. When you turn the ignition to the ON
position, and the rear window defogger switch is depressed. The HVAC control module illuminates the rear window defogger indicator and sends a
class 2 message to the LGM to enable the rear window defogger system. The LGM enable the rear window defogger system by allowing battery
positive voltage to the rear window defogger.
When you turn ON the ignition and press the rear window defogger switch for the first time, the defogger cycle lasts 10 minutes. Further operation
results in 10 minute defogger cycles.
