For 1990-2009 cars

### Heating Ventilation Air Conditioning Scan Tool Data Parameters

Parameter | Operating Conditions | Expected Value | Definition
--- | --- | --- | ---
Ignition is ON, engine OFF, and vehicle is stationary
A/C Head Pressure | -- | 448 kpa | The scan tool displays 0-3450 kPa (0-500 psi). The voltage applied to the BCM input from the A/C refrigerant pressure sensor is converted to a pressure value.
A/C Head Pressure | -- | Normal | The scan tool displays Normal or Out of Range. This is the state of the A/C head pressure.
-- | Out of Range
A/C Permission | -- | Granted | The scan tool displays Granted or Withheld. This is the state of the A/C.
-- | Withheld
A/C Request | A/C button pressed | Yes | The scan tool displays Yes or No. The scan tool displays Yes when the A/C request switch is on. The scan tool displays No when the A/C request switch is off.
A/C button depressed | No
Air Inlet Door Actual | -- | % | This displays Counts. This is the current numeric value of the air inlet door as monitored by the HVAC module.
Air Inlet Door Commanded | -- | % | This displays Counts. This is the numeric value of the air inlet door as commanded by the HVAC module.
Aux. Mode Door Actual | -- | % | This displays Counts. This is the current numeric value of the auxiliary mode door as monitored by the HVAC module.
Aux. Mode Door Commanded | -- | % | This displays Counts. This is the numeric value of the auxiliary mode door as commanded by the HVAC module.
Battery Voltage | -- | 12 Volts | The scan tool displays 0 - 25 volts. The voltage measured from the battery positive voltage circuit and the ground circuit of the HVAC control module.
Blower Motor Relay Command | -- | On | The scan tool displays On/Off. When you select ON, the HVAC control module commands the blower motor relay ON. When you select OFF, the HVAC control module commands the blower motor relay OFF.
-- | Off
Blower Motor Speed | -- | % | This displays percent. This is the percentage of power supplied to the blower motor.
Blower Speed | -- | Normal | The scan tool displays Normal or Off. This is the state of the blower motor speed.
-- | Off
Compressor Performance Test Status | -- | Active |
-- | Not Active
Coolant Temperature | -- | Degrees | The scan tool displays -39 to +140°C (-38 to +284°F). The scan tool displays the engine coolant temperature as detected by the ECM.
Driver Solar Sensor | -- | W/m² | This displays W/m². This is an approximate value at the driver sunload sensor.
Driver Temp. Dr. Actual | -- | % | This displays Counts. This is the current numeric value of the driver temperature door as monitored by the HVAC module.
Driver Temp. Dr. Commanded | -- | % | This displays Counts. This is the numeric value of the driver temperature door as commanded by the HVAC module.
Driver Temp. Setting | -- | Degrees | This displays °C (°F). This is the temperature setting of the driver side area.
Evaporator Temp | -- | 15.5 degrees | This parameter displays the current temperature of the evaporator
Inside Air Temp. Filtered | -- | Degrees | This displays °C (°F). This is the current temperature of the vehicle interior.
Mode Door Actual | -- | % | This displays Percentage. This is the current numeric value of the mode door as monitored by the HVAC module.
Mode Door Commanded | -- | % | This displays Percentage. This is the numeric value of the mode door as commanded by the HVAC module.
Outside Air Temperature Filtered |  | ° | This displays °C (°F). This is the current temperature of the air outside.
Passenger Solar Sensor | -- | W/m² | This displays W/m². This is an approximate value at the passenger sunload sensor.
Passenger Temp. Dr. Actual | -- | % | This displays Counts. This is the current numeric value of the passenger temperature door as monitored by the HVAC module.
Passenger Temp. Dr. Commanded | -- | % | This displays Counts. This is the numeric value of the passenger mode door as commanded by the HVAC module.
Passenger Temp. Setting | -- | Degrees | This displays °C (°F). This is the temperature setting of the passenger side area.
Power Mode | Ignition is in OFF position | OFF | The scan tool displays the system power mode which is dependent on the current position of the ignition cycle.
Ignition is in ACC position | Accessory
Ignition is in RUN position | Run
Ignition is in CRANK position | Crank
Rear Defog Relay | -- | Active | The scan tool displays Active or Inactive. This is the state of the rear defrost switch.
-- | Inactive
Remote Start Status | -- | Active | The scan tool displays Active or Inactive.
-- | Inactive

### Heating Ventilation Air Conditioning Control Module Scan Tool Output Controls

Scan Tool Output Control | Additional Menu Selections | Description
--- | --- | ---
A/C Compressor Performance | Special Function |
Air Inlet Door | Special Function | The scan tool displays On or Off selections. The selection drives the actuator to its minimum or maximum positions.
Aux. Mode Door | Special Function | The scan tool displays On or Off selections. The selection drives the actuator to its minimum or maximum positions.
Blower Motor Relay | Miscellaneous Test | The scan tool commands the blower motor relay On or Off. When you select ON, the HVAC control module commands the blower motor relay ON. When you select OFF, the HVAC control module commands the blower motor relay OFF.
Blower Motor | Miscellaneous Test | The scan tool commands the blower motor On or Off. When ON is selected, the HVAC control module commands the blower motor relay ON and a command to increase or decrease air. When OFF is selected, the HVAC control module commands the blower motor relay OFF.
Driver Temp. Dr. | Special Function | The scan tool displays On or Off selections. The selection drives the actuator to its minimum or maximum positions.
Mode Door position | Special Function | The scan tool displays On or Off selections. The selection drives the actuator to its minimum or maximum positions.
Passenger Temp. Dr. Commanded | Special Function | The scan tool displays On or Off selections. The selection drives the actuator to its minimum or maximum positions.
Rear Defog Request | Special Functions | The scan tool commands the rear defog Active or Inactive.