For 1990-2009 cars

Parameter | Operating Conditions | Expected Value | Definition
--- | --- | --- | ---
Ignition is ON, engine OFF, and vehicle is stationary
A/C Compressor Current |  | 0.008 A | This parameter displays the current of the A/C Compressor.
A/C Compressor PWM |  | % |
A/C Mode Request | -- | Disengaged | The scan tool displays Engage when the ECM receives a GMLAN message from the HVAC control module to engage the A/C compressor. The scan tool displays Disengaged when the ECM receives a GMLAN message from the HVAC control module to disengage the A/C compressor.
-- | Engaged
A/C Pressure | -- | 448 kpa | The scan tool displays 0-3450 kPa (0-500 psi). The voltage applied to the PCM input from the A/C refrigerant pressure sensor is converted to a pressure value.
A/C Status |  | Active | This parameter displays the status of the A/C system.
| Inactive
A/C Switch |  | Active | The scan tool displays Active/Inactive. The scan tool displays Active when the A/C request switch is on. The scan tool displays Inactive when the A/C request switch is off.
| Inactive
Actual Drivers Air Mix Door Pos. | -- | 0 - 100% | The scan tool displays 0-100 %. The actual position of the drivers air mix door interpreted as a percentage by the HVAC control module.
Actual Front Demister Door Pos. | -- | 0 - 100% | The scan tool displays 0-100 %. The actual position of the front demister door interpreted as a percentage by the HVAC control module.
Actual Passenger Air Mix Door Pos. | -- | 0 - 100% | The scan tool displays 0-100 %. The actual position of the passengers air mix door interpreted as a percentage by the HVAC control module.
Actual Rear Air Mix Door Pos. | -- | 0 - 100% | The scan tool displays 0-100 %. The actual position of the rear air mix door interpreted as a percentage by the HVAC control module.
Actual Rear Outlet Door Pos. | -- | 0 - 100% | The scan tool displays 0-100 %. The actual position of the rear outlet door interpreted as a percentage by the HVAC control module.
Actual Recirculation Door Position | -- | 0 - 100% | The scan tool displays 0-100 %. The actual position of the recirculation door interpreted as a percentage by the HVAC control module.
Actual Vent/Floor Outlet Door Pos. | -- | 0 - 100% | The scan tool displays 0-100 %. The actual position of the vent/floor outlet door interpreted as a percentage by the HVAC control module.
Auto Switch |  | Active | The scan tool displays Active/Inactive. The scan tool displays Active when the automatic switch is on. The scan tool displays inactive when the automatic switch is off.
| Inactive
Backup System Power Mode |  | Invalid |
| Valid
Battery Voltage |  |  | 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 Fan Speed Decrease |  | Active | The scan tool displays Active/Inactive. The scan tool displays Active when the Blower Fan Speed Decrease is on. The Scan tool displays inactive when the Blower Fan Speed Decrease is off.
| Inactive
Blower Fan Speed Increase |  | Active | The scan tool displays Active/Inactive. The scan tool displays Active when the Blower Fan Speed Increase is on. The Scan tool displays inactive when the Blower Fan Speed Increase is off.
| Inactive
Blower Fan Speed PWM |  | 0 - 114% | The scan tool displays 0-114%. The scan tool displays the control decision for the blower motor speed as determined by the HVAC control module. The scan tool displays 114% when the blower motor is commanded to maximum speed and 0% when the blower motor is commanded OFF.
Blower Fan Speed Voltage |  | 1.4 Volts |
Commanded Drivers Air Mix Door Pos. | -- | 0 - 100% | The scan tool displays 0-100 %. The commanded position of the drivers air mix door interpreted as a percentage by the HVAC control module.
Commanded Front Demister Door Pos. | -- | 0 - 100% | The scan tool displays 0-100 %. The commanded position of the front demister door interpreted as a percentage by the HVAC control module.
Commanded Passenger Air Mix Door Pos. | -- | 0 - 100% | The scan tool displays 0-100 %. The commanded position of the passengers air mix door interpreted as a percentage by the HVAC control module.
Commanded Rear Air Mix Door Pos. | -- | 0 - 100% | The scan tool displays 0-100 %. The commanded position of the rear air mix door interpreted as a percentage by the HVAC control module.
Commanded Rear Outlet Door Pos. | -- | 0 - 100% | The scan tool displays 0-100 %. The commanded position of the rear outlet door interpreted as a percentage by the HVAC control module.
Commanded Recirculation Door Pos. | -- | 0 - 100% | The scan tool displays 0-100 %. The commanded position of the recirculation door interpreted as a percentage by the HVAC control module.
Commanded Vent/Floor Outlet Door Pos. | -- | 0 - 100% | The scan tool displays 0-100 %. The commanded position of the vent/floor outlet door interpreted as a percentage by the HVAC control module.
Driver Set Temp |  | 23 degrees | The Scan Tool displays the temperature as set by the driver.
Driver Temperature Dial |  | 0 | The scan tool displays the position of the Driver Temperature Dial.
Engine Coolant Temp | -- | 18 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.
Engine ECU A/C Compressor Command |  | Not Allowed |
Engine Speed |  | 0 RPM | The scan tool displays the Speed of the Engine in revolutions per minute.
Evaporator Target Temp | -- | -40 degrees |
Evaporator Temp | -- | 15 degrees |
Evaporator Temp | -- | 15.5 degrees |
Front Demister Switch | Front demister switch activated | Active | The scan tool displays Active/Inactive. The scan tool displays Active when the Front Demister switch is on. The scan tool displays Inactive when the Front Demister switch is off.
Front demister switch deactivated | Inactive
Front Outlet Mode |  | Floor |
In Car Temp | -- | 20 degrees | The scan tool displays -40 to +215°C (-40 to +419°F). The voltage applied to the HVAC control module input for the inside air temperature sensor is converted to a temperature value.
Inlet Mode |  | Fresh |
Mode Decrease Switch | Mode decrease switch activated | Active | The scan tool displays Active/Inactive. The scan tool displays Active when the mode switch is on. The scan tool displays Inactive when the mode switch is off.
Mode decrease switch deactivated | Inactive
Mode Increase Switch | Mode increase switch activated | Active | The scan tool displays Active/Inactive. The scan tool displays Active when the mode switch is on. The scan tool displays Inactive when the mode switch is off.
Mode increase switch deactivated | Inactive
OFF Switch | OFF switch activated | Active | The scan tool displays ON/OFF. The scan tool displays ON when the OFF switch is active. The scan tool displays OFF when the OFF switch is inactive.
OFF switch deactivated | Inactive
Outside Temp | -- | 18.5 degrees | The scan tool displays -40 to +215°C (-40 to +419°F). The voltage applied to the HVAC control module input for the ambient air temperature sensor is converted to a temperature value.
Passenger Set Temp |  |  | The scan tool displays the temperature as set by the passenger.
Passenger Temperature Dial |  | 0 | The scan tool displays the position of the Passenger Temperature Dial.
Rear Mode Switch | Rear mode switch activated | Active | The scan tool displays Active/Inactive. The scan tool displays Active when the Rear mode switch is on. The scan tool displays Inactive when the Rear mode switch is off.
Rear mode switch deactivated | Inactive
Rear Outlet Mode |  | Compartment |
Rear Temperature Dial |  | 0 | The scan tool displays the position of the Rear Temperature Dial.
Rear Window Demister | Rear window demister activated | Active | The scan tool displays the status of the rear window demister, Active when the rear window demister is activated and Inactive when the rear window demister is deactivated.
Rear window demister deactivated | Inactive
Rear Window Demister Switch | Rear window demister switch activated | Active | The scan tool displays the current position of the rear window demister switch, Active when the rear window demister switch is activated and Inactive when the rear window demister switch is deactivated.
Rear window demister switch deactivated | Inactive
Recirculation Switch | Recirculation switch activated | Active | The scan tool displays the current position of the recirculation switch, Active when the recirculation switch is activated and Inactive when the recirculation switch is deactivated.
Recirculation switch deactivated | Inactive
Solar Sensor Driver | -- | % | The scan tool displays the current light intensity detected by the driver solar sensor as a percentage value.
Solar Sensor Passenger | -- | % | The scan tool displays the current light intensity detected by the passenger solar sensor as a percentage value.
System Power Mode | Ignition is in OFF position | OFF | The scan tool displays 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
Vehicle Speed | -- | 0km | The scan tool range is 0-255 km/h (0-158 mph). This parameter indicates the vehicle speed calculated by the ECM from the vehicle speed sensor (VSS).
Zone Configuration | Zone configuration selected | OFF | The scan tool displays the zone configuration status.
Zone configuration deselected | ON
Zone Switch | Zone switch activated | Active | The scan tool displays the current position of the zone switch, Active when the zone switch is activated and Inactive when the zone switch is deactivated.
Zone switch deactivated | Inactive