Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2011IMPALA V6-3.9LREPAIR AND DIAGNOSISWINDOWS AND GLASSHEATED GLASS ELEMENTDESCRIPTION AND OPERATION
2011 Chevrolet Impala V6-3.9L
Heated Glass Element: Description and Operation
2011 Chevrolet Impala V6-3.9LSECTION Description and Operation
Rear Window Defogger Description and Operation
Rear Window Defogger System Components
The rear window defogger system consists of the following components:
* HVAC control module
* Defog relay
* Rear window defogger grid
* BATT 3 Fuse
Rear Window Defogger Operation
When you depress the rear defogger switch, voltage is supplied to the REAR DEFOG relay coil and the HVAC control module also illuminates the rear window defogger indicator. Battery positive voltage is supplied at all times to the REAR DEFOG relay switched input and the REAR DEFOG relay coil is always grounded. This allows battery positive voltage from the relay switched input through the switch contacts and out the relay switched output to the rear window defogger.
When you start the engine and press the rear defogger switch for the first time, the defogger cycle lasts for 20 minutes. Further defogger cycles vary based on ambient temperature and vehicle speed. The rear window defogger will be extended when the ambient temperature is cooler or if the vehicle speed is above 72 km per hour (45 mph).
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.