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.
Heating, Ventilation and Air Conditioning Control Module Scan Tool Information
2008 Pontiac Grand Prix BaseSECTION Heating, Ventilation and Air Conditioning Control Module Scan Tool Information
HVAC Control Module Scan Tool Data Parameters
| Parameter | System State | Expected Value | Definition |
|---|---|---|---|
| Operating Conditions: Engine ON | |||
| A/C Requested | - | No | The scan tool displays Yes or No. Yes is displayed if the air conditioning is requested. |
| Actual Air Inlet Position | - | Varies | This displays Counts. This is the numeric value of the air inlet door as reported to the HVAC module. |
| Air Inlet Dr Actual | - | Varies | This displays Volts. This is the current numeric value of the air inlet door as monitored by the HVAC module. |
| Air Inlet Dr Actual Commanded | - | Varies | This displays Volts. This is the current numeric value of the air inlet door as commanded by the HVAC module. |
| Commanded Air Inlet Pos. | - | Varies | This displays Counts. This is the numeric value of the air inlet door as commanded by the HVAC module. |
| Commanded Blower | - | Varies | This displays percent. This is the percentage of power supplied to the blower motor. |
| Coolant Temperature | - | Varies | This displays °C (°F). This is the current temperature of the engine coolant. |
| Driver Heated Seat | - | Off | The scan tool displays On or Off. This is the current state of the driver heated seat. |
| Driver Program Number | - | Varies | This displays Counts. |
| Inside Air Temp. | - | Varies | This displays °C (°F). This is the current temperature of the vehicle interior. |
| Left AC Duct Temp. | - | Varies | This displays Counts. This is the numeric value of the left A/C duct temperature as commanded by the HVAC module. |
| Left Htr. Duct Temp. | - | Varies | This displays Counts. This is the numeric value of tthe left duct temperature door as reported to the HVAC module. |
| Left Heater Duct Temp. Desired | - | Varies | This displays Counts. This is the numeric value of the left duct temperature as commanded by the HVAC module. |
| Left Solar | - | Varies | This displays Counts. This is an approximate value at the left sunload sensor. |
| Left Temp Dr Actual | - | Varies | This displays Volts. This is the current voltage of the driver temperature door as monitored by the HVAC module. |
| Left Temp. Dr. Commanded | - | Varies | This displays Volts. This is the voltage of the driver temperature door commanded by the HVAC module. |
| Mode Dr. Motor Command | - | Varies | This displays Volts. This is the voltage of the mode door commanded by the HVAC module. |
| Mode Door Commanded | - | Varies | This displays Counts. This is the value of the mode door commanded by the HVAC module. |
| Mode Door Position | - | Varies | This displays Counts or Volts. This is the actual voltage of the mode door reported the HVAC module. |
| Outside Air Temp. | - | Varies | This displays °C (°F). This is the raw value of the outside air temperature. |
| Passenger Heated Seat | - | Off | The scan tool displays On or Off. This is the current state of the passenger heated seat. |
| Psgr. Program Number | - | Varies | This displays Counts. |
| Remote Start Request | - | Disabled | The scan tool displays Enabled or Disabled. |
| Right AC Duct Temp. | - | Varies | This displays Counts. This is the numeric value of the right A/C duct temperature as commanded by the HVAC module. |
| Right Htr. Duct Temp. | - | Varies | This displays Counts. This is the numeric value of tthe right duct temperature door as reported to the HVAC module. |
| Right Heater Duct Temp. Desired | - | Varies | This displays Counts. This is the numeric value of the right duct temperature as commanded by the HVAC module. |
| Right Solar | - | Varies | This displays Counts. This is an approximate value at the right sunload sensor. |
| Right Temp Dr Actual | - | Varies | This displays Volts. This is the current voltage of the passenger temperature door as monitored by the HVAC module. |
| Right Temp. Dr. Commanded | - | Varies | This displays Volts. This is the voltage of the passenger temperature door commanded by the HVAC module. |
| Selected Air Mode | - | Varies | The scan tool displays Auto; Upper; Bi-Level; Heat/Defrost; Defrost; Off or N/A. This displays the current air delivery mode commanded by the HVAC control module. |
| System Program Number | - | Varies | This displays Counts. |
| Vehicle Speed Signal | - | 0 mph | This displays the current vehicle speed in MPH.. |
HVAC Control Module Scan Tool Output Controls
| Scan Tool Output Control | Description |
|---|---|
| A/C Request | This command allows you to turn the A/C Relay On and Off. When the A/C Relay is commanded On, the A/C compressor clutch should be engaged. |
| Air Inlet Door | The scan tool displays On or Off selections. The selection drives the actuator to its minimum or maximum positions. |
| All Status LEDs | All HVAC status LEDs illuminate when ON is selected and turn off when OFF is selected. |
| Blower Motor | The scan tool displays Off or On selections. This function allows you to command the blower motor to its maximum or minimum speeds. |
| Left Temp. Door Position | The scan tool displays On or Off selections. The selection drives the actuator to its minimum or maximum positions. |
| Mode Door Position | The scan tool displays On or Off selections. The selection drives the actuator to its minimum or maximum positions. |
| Recalibrate All Motors | When ON is selected, all air temp and mode actuators have the capability to perform a recalibration. |
| Right Temp. Door Position | The scan tool displays On or Off selections. The selection drives the actuator to its minimum or maximum positions. |
| Segment Check | The scan tool displays On or Off selections. Selecting ON activates all display segments and lamps in the HVAC control. |
| Temp. Door Position | The scan tool displays On or Off selections. The selection drives the actuator to its minimum or maximum positions. |
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.