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 MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 213 (HVAC SYSTEM - AUTOMATIC)COMPONENT LOCATORHVAC CONNECTOR END VIEWSHVAC CONTROL MODULE, C1

2008 Pontiac Grand Prix Base

HVAC Control Module, C1

2008 Pontiac Grand Prix BaseSECTION HVAC Control Module, C1

WARNING: This page is about a different car, the 2007 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: HVAC Control Module C1 Connector End View

Courtesy of GENERAL MOTORS CORP.

HVAC Control Module C1 Connector Part Information

Connector Part Information

OEM: 12110259
Service: 12110259
Description: 16-Way F Micro-Pack 100 Series (GN)

Terminal Part Information

Pins: A1-A3, A5-A8, B1, B3-B8
Terminal/Tray: 12146447/3
Core/Insulation Crimp: E/C
Release Tool/Test Probe: 12031876-1/J-35616-6 (BN)

HVAC Control Module C1 Connector Terminal Identification

Pin	Wire Color	Circuit No.	Function
A1	OG	1040	Battery Positive Voltage
A2	PK	739	Ignition 1 Voltage
A3	WH	1038	HVAC Class 2 Serial Data
A4	-	-	Not Used
A5	GY	8	Instrument Panel Lamp Supply Voltage
A6	BK	150	Ground
A7	D-GN	734	Inside Air Temperature Sensor Signal
A8	GY	720	Low Reference
B1	BK	516	Upper Left Air Temperature Sensor Signal
B2	-	-	Not Used
B3	TN	517	Upper Right Air Temperature Sensor Signal
B4	PU	719	Low Reference
B5	L-BU/BK	590	Driver Sunload Sensor Signal
B6	GY	1548	Passenger Sunload Sensor Signal
B7	BN	718	Low Reference
B8	BK	1551	Ground

RENDER: 1.0x

NO RELATED

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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.