Control Components
Control Components
Electronic Manual Temperature Control (EMTC)
The Electronic Manual Temperature Control (EMTC) components are used to select:
- air inlet source (outside or recirculated).
- blower motor speed.
- discharge air temperature (temperature blend).
- discharge air location (defrost, panel, floor).
- A/C compressor operation.
Control System Inputs
HVAC Module
The Electronic Manual Temperature Control (EMTC) system uses a remote HVAC module that is separate from the control interface. The Front Controls Interface Module (FCIM) provides the interface for the vehicle occupants to control the climate control system. When selections are made, the FCIM (Front Controls Interface Module) communicates the selections to the HVAC module through the vehicle module communication network. The remote HVAC module controls the climate control system based on the FCIM (Front Controls Interface Module) selections.
The HVAC module is located under the instrument panel below the Audio Control Module (ACM).
Control System Outputs
The EMTC (Electronic Manual Temperature Control) system has 4 system outputs.
Blower Motor Speed
The blower motor speed control controls the blower motor speed by converting low power signals from the HVAC module to a high-current, variable ground feed for the blower motor. A delay function is used to provide a gradual increase or decrease in blower motor speed under all conditions.
The blower motor speed control is located on the heater core and evaporator core housing near the blower motor.
Temperature Blend Door Position
The temperature blend door actuator moves the temperature blend door on command from the HVAC module.
The temperature blend door actuator contains a reversible electric motor and a potentiometer. The potentiometer circuit consists of a 5-volt reference signal connected to one end of a variable resistor, and a signal ground connected to the other. A signal circuit is connected to a contact wiper, which is driven along the variable resistor by the actuator shaft. The signal to the HVAC module from the contact wiper indicates the position of the temperature blend door. The HVAC module powers the actuator motor to move the temperature blend door to the desired position. The desired position is set by the vehicle occupants using the temperature selector knob.
The temperature blend door actuator is located on the heater core and evaporator core housing.
Airflow Mode Door Position
The airflow mode door actuator uses a cam and lever assembly to position the airflow mode doors on command from the HVAC module. The mode door actuator contains a reversible electric motor and potentiometer. The potentiometer allows the HVAC module to monitor the position of the airflow mode doors. The potentiometer circuit consists of a 5-volt reference signal connected to one end of a variable resistor, and a signal ground connected to the other. A signal circuit is connected to a contact wiper, which is driven along the variable resistor by the actuator shaft. The signal to the HVAC module from the contact wiper indicates the position of the airflow mode doors. The HVAC module powers the actuator motor to move the airflow mode doors to the desired position. The desired position is set by the vehicle occupants using the mode selector buttons.
The airflow (defrost/panel/floor) mode door actuator is located on the heater core and evaporator core housing to the right of the steering column.
Air Inlet Mode Door Position
The air inlet mode door actuator moves the air inlet door between the fresh and RECIRC positions on command from the HVAC module. The air inlet mode door actuator is driven to, and will automatically stop at, the full RECIRC or full fresh air inlet position and does not require a potentiometer circuit to monitor its position. The air inlet mode door does not stop at any point between the RECIRC or fresh air inlet position.
The air inlet mode door actuator is located on the air inlet duct behind the glove compartment.
Dual-Zone Electronic Automatic Temperature Control (EATC)
The HVAC module analyzes input from the following major sources:
- Temperature, airflow direction, blower, A/C and RECIRC selection (made by the vehicle occupants)
- In-vehicle temperature sensor
- Ambient temperature sensor
- Solar radiation sensor
- Vehicle speed
- Engine Coolant Temperature (ECT)
Using these inputs, the dual-zone HVAC module determines the correct conditions for the following outputs:
- A/C compressor operation
- Blower speed
- RH and LH temperature blend door positions
- Defrost/panel/floor airflow mode door position
- Air inlet door position
Control System Inputs
The dual-zone Electronic Automatic Temperature Control (EATC) system has 4 control system inputs.
HVAC Module
The dual-zone EATC (Electronic Automatic Temperature Control) system uses a remote HVAC module that is separate from the control interface. The Front Controls Interface Module (FCIM) provides the interface for the vehicle occupants to control the climate control system. When selections are made, the FCIM (Front Controls Interface Module) communicates the selections to the HVAC module through the vehicle module communication network. The remote dual-zone HVAC module controls the climate control system based on the FCIM (Front Controls Interface Module) selections or will automatically control the climate control system in the AUTO mode.
In-Vehicle Temperature Sensor
The in-vehicle temperature sensor contains a thermistor, which measures the in-vehicle air temperature and sends that reading to the HVAC module. An aspirator hose is connected between the heater core and evaporator core housing and the in-vehicle temperature sensor. The aspirator hose uses airflow through the heater core and evaporator core housing to create a Venturi-type suction to draw in vehicle air through the in-vehicle temperature sensor (across the thermistor).
The in-vehicle temperature sensor is located to the right of the steering column shroud behind the in-vehicle temperature sensor grille.
Sunload Sensor (Light Sensor)
The sunload sensor supplies information to the dual-zone HVAC module indicating sunload. When sunload is detected, the information from the sensor is used to lower the A/C temperature output to compensate for radiant heat warming the vehicle interior and occupants.
The sunload sensor is also used by the exterior lighting system for autolamp operation. For removal and installation of the sunload sensor, refer to Light Sensor in Lighting and Horns.
Ambient Temperature Sensor
The ambient temperature sensor signal is received by the HVAC module and indicates the outside air temperature. The ambient temperature sensor is located in front of the radiator below the bumper beam.
The ambient temperature sensor signal is not the sole factor considered by the HVAC module for the outside air temperature display. Therefore, the ambient temperature PID monitored with a scan tool may not exactly match the HVAC module display.
Control System Outputs
The dual-zone EATC (Electronic Automatic Temperature Control) system has 4 control system outputs. When operating in AUTO mode, the control system outputs will be automatically adjusted by the HVAC module.
NOTE: Each of the 4 control system outputs may be overridden by the passenger if desired.
Blower Motor Speed
The blower motor speed control controls the blower motor speed by converting low power signals from the HVAC module to a high-current, variable ground feed for the blower motor. A delay function is used to provide a gradual increase or decrease in blower motor speed under all conditions.
The blower motor speed control is located on the heater core and evaporator core housing near the blower motor.
Temperature Blend Door Position
The dual-zone EATC (Electronic Automatic Temperature Control) system uses 2 temperature blend door actuators to control 2 separate temperature blend doors. The temperature blend doors independently vary the LH side and RH side temperature settings, as desired. The temperature blend door actuators each contain a reversible electric motor and a potentiometer. The potentiometer circuit consists of a 5-volt reference signal connected to one end of a variable resistor, and a signal ground connected to the other. A signal circuit is connected to a contact wiper, which is driven along the variable resistor by the actuator shaft. The signal to the HVAC module from the contact wiper indicates the position of the temperature blend door. The HVAC module powers the actuator motors to move the temperature blend doors to the desired positions. The desired temperature blend door positions are calculated by the HVAC module based on the set temperature, in-vehicle temperature, ambient temperature and sunload.
The LH temperature blend door actuator is located on the heater core and evaporator core housing near the accelerator pedal. The RH temperature blend door actuator is located on the heater core and evaporator core housing to the left of the glove compartment.
Airflow Mode Door Position
The airflow mode door actuator uses a cam and lever assembly to position the airflow mode doors on command from the HVAC module. The mode door actuator contains a reversible electric motor and potentiometer. The potentiometer allows the HVAC module to monitor the position of the airflow mode doors. The potentiometer circuit consists of a 5-volt reference signal connected to one end of a variable resistor, and a signal ground connected to the other. A signal circuit is connected to a contact wiper, which is driven along the variable resistor by the actuator shaft. The signal to the HVAC module from the contact wiper indicates the position of the airflow mode doors. The HVAC module powers the actuator motor to move the airflow mode doors to the desired position. The HVAC module determines the desired airflow mode door position based on the calculated outlet temperature.
The airflow (defrost/panel/floor) mode door actuator is located on the heater core and evaporator core housing to the right of the steering column.
Air Inlet Mode Door Position
The air inlet mode door actuator moves the air inlet door between the fresh and RECIRC positions on command from the HVAC module. The air inlet mode door actuator is driven to, and will automatically stop at, the full RECIRC or full fresh air inlet position and does not require a potentiometer circuit to monitor its position. The air inlet mode door does not stop at any point between the RECIRC or fresh air inlet position.
The air inlet mode door actuator is located on the air inlet duct behind the glove compartment.