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 MANUALSCHEVROLET2012CORVETTE V8-6.2LREPAIR AND DIAGNOSISWINDOWS AND GLASSHEATED GLASS ELEMENTDESCRIPTION AND OPERATION
2012 Chevrolet Corvette V8-6.2L
Heated Glass Element: Description and Operation
2012 Chevrolet Corvette V8-6.2LSECTION Description and Operation
Rear Window Defogger Description and Operation
Rear Window Defogger System Components
The rear window defogger system consist of the following components:
* HVAC control module
* REAR DEFOG relay
* Rear window defogger grid
Rear Window Defogger Operation
Battery positive voltage is supplied through the BATT 2 fuse located in the underhood fuse block to the REAR DEFOG relay coil and switched inputs. When the rear window defogger switch is depressed, the HVAC control module energizes the REAR DEFOG relay by grounding the control circuit. 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 grid. The HVAC control module also illuminates the rear window defogger indicator upon this request. Ground for the rear window defogger grid is provided by G301.
When you start the engine and depress the rear window defogger switch, the defogger cycle lasts for 10 minutes. Further operation will result in 5 minute defogger cycles.
The rear defogger feature will not time out if vehicle speed is above 48 km/h (30 mph).
If battery voltage is low, the rear defogger feature will be disabled.
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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.