For 1990-2009 cars

Table 1: | Heating Ventilation and Air Conditioning Control Module Scan Tool Data Parameters
Table 2: | Heating Ventilation and Air Conditioning Control Module Scan Tool Output Controls

#### Heating Ventilation and Air Conditioning Control Module Scan Tool Data Parameters

Parameter | System State | Expected Value | Description
--- | --- | --- | ---
Operating Conditions: Ignition ON
A/C Compressor Clutch Inhibit Reason | -- | -- | --
A/C Compressor Clutch Status | Engine running, A/C Off | Disengaged | The scan tool displays Engaged or Disengaged depending on the state of the A/C compressor.
Engine running, A/C On | Engaged
A/C Evaporator Temperature Sensor | -- | -40 to +80°C (-40 to + 176°F) | The scan tool displays °C (°F). This is the current temperature at the A/C evaporator temperature sensor.
A/C High Side Pressure Sensor | -- | -- | --
A/C Indicator | A/C Off | Off | The scan tool displays On or Off depending on the state of the A/C mode.
A/C On | On
A/C Request Signal | A/C Off | Inactive | The scan tool displays Active or Inactive depending on the state of the A/C mode.
A/C On | Active
A/C Switch | A/C Switch released | Inactive | The scan tool displays Active or Inactive depending on the state of the A/C switch.
A/C Switch pressed | Active
Air Recirculation Door Motor Command | -- | -- | Counts
Air Recirculation Door Position | -- | -- | Counts
Air Recirculation LED | Air recirculation mode is deactivated | Off | The scan tool displays On or Off depending on the state of the Recirculation mode.
Air recirculation mode is activated | On
Air Recirculation Mode Switch | Air recirculation switch released | Inactive | The scan tool displays Active or Inactive depending on the state of the air recirculation mode switch.
Air recirculation switch pressed | Active
Ambient Air Temperature (Filtered) | -- | -40 to +80°C (-40 to + 176°F) | The scan tool displays °C (°F). This is the current temperature at the ambient air temperature sensor.
Auto HVAC Button | Auto HVAC button released | Inactive | The scan tool displays On or Off depending on the state of the Auto HVAC button.
Auto HVAC button pressed | Active
Auto HVAC Indicator | Auto mode is deactivated | Off | The scan tool displays On or Off depending on the state of the Auto mode.
Auto mode is activated | On
Auxiliary Heater Output Status | -- | OK | The scan tool displays OK or Malfunction. Malfunction is displayed if there is an auxiliary heater malfunction.
Battery Voltage | -- | 11-14 V | The scan tool displays V. This is the current battery voltage.
Bi-level Indicator | -- | -- | --
Blower Motor Speed | -- | 0-100% | The scan tool displays % depending on the state of the selected blower motor speed. The value increases stepwise from 0 to 100% depending the selected speed.
Blower Motor Speed Command | -- | 0-100% | The scan tool displays % depending on the state of the selected blower motor speed. The value increases stepwise from 0 to 100% depending the selected speed.
Blower Motor Switch | -- | Varies | Only with C68 The scan tool displays OFF, 1 to 8 depending on the state of the selected blower motor speed. Only with CJ2 The scan tool displays Up, Down or Inactive depending on the state of the blower motor switches.
Blower Speed Indicator | -- | -- | --
Desired Left Duct Temperature | -- | -- | --
Desired Left Temperature | -- | -- | The scan tool displays [ordm ]C ([ordm ]F) depending on the selected left temperature.
Desired Left Temperature Motor Door Position | -- | -- | --
Engine Coolant Temperature | -- | -40 to +215°C (-40 to +419°F) | The scan tool displays [ordm ]C ([ordm ]F). This is the current engine coolant temperature.
Enhanced Defrost Indicator | Enhanced defrost mode is deactivated | Off | The scan tool displays On or Off depending on the state of the enhanced defrost mode.
Enhanced defrost mode is activated | On
Enhanced Defrost Switch | Enhanced defrost switch released | Off | The scan tool displays On or Off depending on the state of the enhanced defrost switch.
Enhanced defrost switch pressed | On
Floor Mode Indicator | Floor mode is deactivated | Off | The scan tool displays On or Off depending on the state of the floor mode.
Floor mode is activated | On
Floor Mode Switch | Floor mode switch released | Off | The scan tool displays On or Off depending on the state of the floor mode switch.
Floor mode switch pressed | On
Front Defrost Indicator | Front defrost mode is deactivated | Off | The scan tool displays On or Off depending on the state of the front defrost mode.
Front defrost mode is activated | On
Front Defrost Switch | Front defrost switch released | Off | The scan tool displays On or Off depending on the state of the front defrost switch.
Front defrost switch pressed | On
Front HVAC System Status | -- | -- | --
Heating Element 1 Duty Cycle Command | -- | -- | --
HVAC Actuators Supply Voltage | -- | Active | The scan tool displays Active or Inactive. Inactive is displayed if there is a malfunction at the actuators supply voltage circuit.
Instrument Panel Vents Indicator | Instrument panel vents mode is deactivated | Off | The scan tool displays On or Off depending on the state of the instrument panel vents mode.
Instrument panel vents mode is activated | On
Instrument Panel Vents Switch | Instrument panel vents switch released | Inactive | The scan tool displays Active or Inactive depending on the state of the instrument panel vents switch.
Instrument panel vents switch pressed | Active
Left Front Seat Heating Switch | Left front seat heating switch released | Off | The scan tool displays On or Off depending on the state of the left front seat heating switch.
Left front seat heating switch pressed | On
Left Front Seat Ventilation Switch | Left front seat ventilation switch released | Off | The scan tool displays On or Off depending on the state of the left front seat ventilation switch.
Left front seat ventilation switch pressed | On
Left Mode Door Motor Direction | -- | -- | --
Left Temperature Door Motor Calibration Status | -- | -- | --
Left Temperature Door Motor Direction | -- | -- | The scan tool displays Stop, Increase or Decrease. During the movement of the left temperature door, the scan tool shows Increase or Decrease depending the movement direction. When the selected position of the door is reached, the scan tool displays Stop.
Left Temperature Door Position | -- | -- | --
Left Temperature Knob Position | -- | Varies | The scan tool displays counts. Only with C67 The value varies between -7 to +7 depending the selected temperature knob position. At the left end position is the value 16 and at the right end position -16. Only with C68 The value varies between -5 to +5 depending the selected temperature knob position. At the left end position is the value 18 and at the right end position -18.
Left Temperature Switch | -- | -- | --
Lower Left Duct Temperature Sensor | -- | -40 to +80°C (-40 to + 176°F) | The scan tool displays °C (°F). This is the current temperature at the lower left duct temperature sensor.
Lower Right Duct Temperature Sensor | -- | -40 to +80°C (-40 to + 176°F) | The scan tool displays °C (°F). This is the current temperature at the lower right duct temperature sensor.
Mode Door 1 Motor Command | -- | -- | --
Mode Door Motor Calibration Status | -- | -- | --
Mode Door Position | -- | -- | --
Odor Sensor | -- | -- | Counts ??? Sensor-CTS 5-95%
Passenger Compartment Air Temperature (Filtered Data) | -- | -40 to +80°C (-40 to + 176°F) | The scan tool displays °C (°F). This is the current temperature at the passenger compartment air temperature sensor.
Passenger Compartment Air Temperature (Unfiltered Data) | -- | -40 to +80°C (-40 to + 176°F) | The scan tool displays °C (°F). This is the current temperature at the passenger compartment air temperature sensor.
Passenger Compartment Humidity | -- | 3-100% | The scan tool displays %. This is the current relative humidity level at the windshield temperature and inside moisture sensor.
Passenger Compartment Humidity Sensor Temperature | -- | -40 to +80°C (-40 to + 176°F) | The scan tool displays °C (°F). This is the current temperature at the humidity sensing element temperature sensor.
Rear Defogger LED Command | Rear defogger is deactivated | Off | The scan tool displays On or Off depending on the state of the rear defogger.
Rear defogger is activated | On
Rear Defogger Status | Rear defogger is deactivated | Off | The scan tool displays On or Off depending on the state of the rear defogger.
Engine running /Rear defogger is activated | On
Rear Defogger Switch | Rear defogger switch released | Inactive | The scan tool displays Active or Inactive depending on the state of the rear defogger switch.
Rear defogger switch pressed | Active
Recirculation Door Motor Direction | -- | -- | --
Recirculation Door Motor Direction | Air recirculation mode is deactivated | Outside Air | The scan toll displays Stop, Outside Air, Increase, Recirculation, Decrease or Not Used depending on the state of the recirculation door. During the movement of the door, the scan tool shows Increase or Decrease depending the movement direction.
Air recirculation mode is activated | Recirculation
Remote Vehicle Start Status | -- | -- | --
Requested Idle Boost Level | -- | -- | --
Right Front Seat Heating Switch | Right front seat heating switch released | Inactive | The scan tool displays Active or Inactive depending on the state of the right front seat heating switch.
Right front seat heating switch pressed | Active
Right Front Seat Ventilation Switch | Right front seat ventilation switch released | Inactive | The scan tool displays Active or Inactive depending on the state of the right front seat ventilation switch.
Right front seat ventilation switch pressed | Active
Sun Azimuth | -- | 0-90° | The scan tool displays °. This is the current angle in the horizontal plane between the sun and the vehicle driving direction.
Sun Elevation | -- | 0-360° | The scan tool displays °. This is the current angle in the vertical sun height.
Sunload | -- | 0-1200 W/m² | The scan tool displays W/m². This is the current sun heat intensity.
Upper Left Duct Temperature Sensor | -- | -40 to +80°C (-40 to + 176°F) | The scan tool displays °C (°F). This is the current temperature at the upper left duct temperature sensor.
Windshield Temperature | -- | -40 to +80°C (-40 to + 176°F) | The scan tool displays °C (°F). This is the current temperature at the windshield temperature sensor.

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

Output Control | Description
--- | ---
A/C Evaporator Temperature | --
A/C Indicator | The HVAC control module illuminates the A/C indicator when commanded from the scan tool.
A/C Switch | --
Air Recirculation LED | The HVAC control module illuminates the Air Recirculation indicator when commanded from the scan tool.
Air Recirculation Mode Switch | When On is selected, the HVAC control module commands the air recirculation door from outside air to recirculation. When Off is selected, the HVAC control module commands the air recirculation door from recirculation to outside air.
Ambient Air Temperature | --
Auto HVAC Indicator | The HVAC control module illuminates the Auto indicator when commanded from the scan tool.
Auxiliary Heater Request | When On is selected, the HVAC control module sends a request signal to the auxiliary heater.
Auxiliary Mode Door Position | --
Auxiliary Mode Switch Position | --
Bi-level Indicator | --
Blower Motor Switch | --
Blower Speed Indicator | --
Enhanced Defrost Indicator | The HVAC control module illuminates the enhanced defrost indicator when commanded from the scan tool.
Floor Mode Indicator | The HVAC control module illuminates the floor mode indicator when commanded from the scan tool.
Fresh Air Indicator | --
Front Defrost Indicator | The HVAC control module illuminates the front defrost indicator when commanded from the scan tool.
HVAC Actuators | Learned/Not Learned Motor Learn Routine Enable; Motor Learn Routine Control
HVAC Afterblow Configuration | Disable/Enable Setup
Instrument Panel Vents Indicator | The HVAC control module illuminates the instrument panel vents indicator when commanded from the scan tool.
Left Temperature Door Motor Direction | When Increase is selected, the left temperature door position increases stepwise. When Decrease is selected, the left temperature door position decreases stepwise.
Left Temperature Door Position | This commands the left temperature door position from Cold to Hot.
Left Temperature Knob Position | When Increase is selected, the left temperature increases stepwise. When Decrease is selected, the left temperature decreases stepwise.
Left Temperature Switch | --
Lower Right Duct Temperature Sensor | --
Mode Door Motor Command | The HVAC control module commands the mode actuator stepwise from defrost to floor and back again.
Mode Door Position | When Floor is selected, the HVAC control module commands the mode actuator to the floor position. When Defrost is selected, the HVAC control module commands the actuator to the defrost position.
Mode Switch | --
MULTI-ZONE Switch | --
Rear Defog | The HVAC control module commands the rear defogger On and Off.
Rear Defogger Status | The HVAC control module commands the rear defogger On and Off.
Recirculation Door | The HVAC control module commands the recirculation actuator stepwise from outside air to recirculation and back again.
Recirculation Door Motor Direction | --
Temp. Door Position | --
Windshield Temperature | --