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 88 (HVAC SYSTEM - AUTOMATIC)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL OUTPUT CONTROLS
2008 Pontiac Grand Prix Base
Scan Tool Output Controls
2008 Pontiac Grand Prix BaseSECTION Scan Tool Output Controls
WARNING: This page is about a different car, the 2007 Buick LaCrosse and 2007 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
HVAC Control Module Scan Tool Output Controls
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| A/C Request | Engine Output Controls | When commanded the scan tool displays Yes when requested On and No when not requested. |
| Air Inlet Door Position | Engine Output Controls | The scan tool displays On or Off selections. The selection drives the actuator to its minimum or maximum positions. |
| Blower Motor Speed | Engine Output Controls | The scan tool displays Off or On selections. This function allows you to command the blower motor to its maximum or minimum speeds. |
| Driver Temp. Door | Engine Output Controls | The scan tool displays On or Off selections. The selection drives the actuator to its minimum or maximum positions. |
| Mode Door Position | Engine Output Controls | The scan tool displays On or Off selections. The selection drives the actuator to its minimum or maximum positions. |
| Passenger Temp. Door | Engine Output Controls | The scan tool displays On or Off selections. The selection drives the actuator to its minimum or maximum positions. |
| Recalibrate all Motors | Engine Output Controls | When commanded the scan tool displays the actuators counts moving between 0 and 255 counts. |
PCM Scan Tool Output Controls
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| A/C Relay | Engine Output Controls | The scan tool displays Commanded State: None, Off, or On. This function allows you to command the A/C compressor clutch relay ON and OFF. The state of the A/C compressor clutch should correspond to the state of the A/C compressor clutch relay. |
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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.