Heating Ventilation Air Conditioning (HVAC) Control Module - Electronic Manual Temperature Control (EMTC)

Two styles of HVAC control modules are available for the EMTC system:

• Without MS-CAN
• With MS-CAN

The EMTC HVAC control module with  MS-CAN sets Diagnostic Trouble Codes (DTCs). The air inlet door actuator is a 5 circuit stepper motor style actuator which may be automatically controlled by the module. A/C requests are sent to the BCM via the MS-CAN.

The EMTC HVAC control module without  MS-CAN does not set Diagnostic Trouble Codes (DTCs). The air inlet door actuator contains a reversible electric motor with no potentiometer and is either fully open or fully closed. A/C requests are sent to the BCM via a dedicated circuit.

The blower motor speed switch is mounted in the HVAC control module and controls blower motor speed by adding or bypassing resistors in the blower motor resistor in all modes except OFF. The blower motor speed switch is serviced only as an assembly with the HVAC control module.

The temperature control switch adjusts the discharge air temperature. Movement of the temperature knob from cool to warm causes a corresponding movement of the temperature blend door. The position of the temperature blend door determines the discharge air temperature. The temperature control selector is an integral part of the HVAC control module and cannot be serviced separately.

The airflow mode setting adjusts the discharge air outlet location. Each airflow mode selector icon causes a corresponding movement of the airflow blend doors and determines the discharge air outlet location. The airflow mode selector knob is an integral part of the HVAC control module and cannot be serviced separately.

The A/C button determines A/C compressor operation, except when the temperature selector is set to MAX A/C or the airflow mode selector is in defrost mode. The A/C button is an integral part of the HVAC control module and cannot be serviced separately.

The recirculated air request button can be activated in any mode except defrost, and in any mode except MAX A/C. The recirculated air request button is an integral part of the HVAC control module and cannot be serviced separately.