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 MANUALSPONTIAC2006G6 GTP, 2D COUPE, STANDARDREPAIR AND DIAGNOSISBODY & FRAMEWINDOWSSTATIONARY WINDOW SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESREAR WINDOW DEFOGGER INOPERATIVE (C68 AUTO A/C) DIAGNOSTIC FAULT INFORMATIONCIRCUIT/SYSTEM TESTINGHVAC CONTROL MODULE MALFUNCTION
2006 Pontiac G6 GTP, 2D Coupe, Standard
HVAC Control Module Malfunction
2006 Pontiac G6 GTP, 2D Coupe, StandardSECTION HVAC Control Module Malfunction
- Ignition OFF, disconnect the harness connector C1 at the HVAC control module.
- Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit terminal A12 and ground. => If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, verify the scan tool Manual HVAC Rear Defog Sw parameter is OFF. => If not the specified value, test the signal circuit terminal A5 for a short to ground. If the circuit tests normal, replace the BCM.
- Install a 3-amp fused jumper wire between the signal circuit terminal A5 and ground. Verify the scan tool Manual HVAC Rear Defog Sw parameter is ON. => If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
- If all circuits test normal, test or replace the HVAC control module.
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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.