Heating, Ventilation and Air Conditioning Control Module Scan Tool Information

HVAC Control Module Scan Tool Data Parameters

Parameter	System State	Expected Value	Description
Operating Conditions: Ignition ON, HVAC OFF
A/C Request	-	No	The scan tool displays Yes or No. Yes is displayed if the air conditioner is requested.
A/C Evap. Temperature Sensor	-	Varies	This displays °F (°C). This is the current temperature of the evaporator temperature sensor.
A/C High Side Pressure Sensor	-	Varies	This displays kPa (psi). The voltage applied to the ECM input from the A/C refrigerant pressure sensor is converted to a pressure value.
Ambient Air Temp. Sensor	-	Varies	This displays °F (°C). This is the current temperature at the ambient air temperature sensor.
Aux. Mode Door Actual	-	Varies	This displays Counts. This is the current auxiliary mode door position measured in counts.
Aux. Mode Door Commanded	-	Varies	This displays Counts. This is the commanded auxiliary mode door motor request measured in counts.
Aux. Temp. Dr. Position	-	Varies	This displays Counts. This is the current auxiliary temperature door position measured in counts.
Aux. Temp. Dr. Motor Command	-	Varies	This displays Counts. This is the commanded auxiliary temperature door motor request measured in counts.
Blower Motor Relay Cmd.	-	Off	This displays the commanded state of the blower motor relay.
Blower Motor Speed Command	-	0%	This displays %. This is the commanded blower motor speed measured in percentage.
Coolant Temperature	-	Varies	This displays °F (°C). This is the current temperature of the engine coolant.
Driver Temp. Dr. Motor Command	-	Varies	This displays Counts. This is the commanded driver temperature door motor request measured in counts.
Driver Temp. Dr. Position	-	Varies	This displays Counts or Pulses. This is the current driver temperature door position measured in either counts or pulses.
Inside Air Temp. Sensor	-	Varies	This displays °F (°C). This is the current temperature at the inside air temperature sensor.
Left Sunload Sensor	-	Varies	This displays Counts. This is the current sunload measured in counts at the driver sunload sensor.
Mode Door Position	-	Varies	This displays Counts or Pulses. This is the current mode door position measured in either counts or pulses.
Mode Dr. Motor Command	-	Varies	This displays Counts. This is the commanded mode door motor request measured in counts.
Psgr. Temp. Dr. Motor Command	-	Varies	This displays Counts. This is the commanded passenger temperature door motor request measured in counts.
Psgr. Temp. Dr. Position	-	Varies	This displays Counts or Pulses. This is the current passenger temperature door position measured in either counts or pulses.
Recirculation Dr. Motor Command	-	Varies	This displays Counts. This is the commanded recirculation temperature door motor request measured in counts.
Recirculation Dr. Position	-	Varies	This displays Counts or Pulses. This is the current recirculation temperature door position measured in either counts or pulses.
Rear Defrost State	-	Off	This displays the current state of the rear defrost switch.
Right Sunload Sensor	-	Varies	This displays Counts. This is the current sunload measured in counts at the passenger sunload sensor.
Vehicle Speed	-	0 km/h (0 mph)	This displays km/h (mph). This is the current vehicle speed.
Water Pump Relay	-	Off	This displays the current state of the water pump relay.

HVAC Control Module Scan Tool Output Controls

Output Control	Description
Auxiliary Air Temp. Door	The scan tool displays On or Off selections. This function drives the actuator to its minimum or maximum positions.
Auxiliary Mode Door	The scan tool displays On or Off selections. This function drives the actuator to its minimum or maximum positions.
Blower Motor	The scan tool displays Off or On selections. This function allows you to command the blower motor to its maximum (100%) or minimum (0%) speeds for 5 seconds.
Driver Temp. Door	The scan tool displays On or Off selections. The selection drives the actuator to its minimum (cold) or maximum (hot) positions for 20 seconds.
Inside Air Temp. Sensor Fan	The scan tool displays Commanded State: On or Off. This function allows you to command the inside air temperature sensors fan On and Off.
Mode Door Position	The scan tool displays On or Off selections. This function drives the actuator to its minimum (defrost) or maximum (upper) positions for 20 seconds.
Passenger Temp. Door	The scan tool displays On or Off selections. The selection drives the actuator to its minimum (hot) or maximum (cold) positions for 20 seconds.
Rear Defog Request	The scan tool displays Commanded State: On or Off. This function allows you to command the rear defog On and Off.
Recirculation Door	The scan tool displays On or Off selections. This function drives the actuator to its minimum (outside air) or maximum (recirculate) stops for 20 seconds.
Segment Check	The scan tool displays Commanded State: On or Off. This function allows you to illuminate all segments on the HVAC control modules display.