Description
AIR CONDITIONER CONTROLDescription
The front air control provides regulation of the vehicle's interior temperature. The system is based on the position of the front air controls temperature switch selected by the driver. This is done by utilizing a microcomputer, also referred to as the front air control, which receives input signals from the following two sensors:
- Intake sensor
- PBR (position balanced resistor).
The front air control uses these signals (including the set position of the temperature switch) to control:
- Outlet air volume
- Air temperature
- Air distribution
Operation
AIR MIX DOOR CONTROL
The air mix door is controlled so that in-vehicle temperature changed based on the position of the temperature control dial.
BLOWER SPEED CONTROL
Blower speed is controlled based on front blower switch settings.
When blower switch is turned, the blower motor starts and increases air flow volume each time the blower switch is turned clockwise, and decreases air flow volume each time the blower switch is turned counterclockwise.
INTAKE DOORS CONTROL
The intake doors are controlled by the recirculation switch setting, and the mode (recirculation is not allowed in floor, floor/defrost or defrost modes) control dial setting.
MODE DOOR CONTROL
The mode door is controlled by the position of the mode control dial.
DEFROSTER DOOR CONTROL
The defroster door is controlled by turning the defroster dial to front defroster.
MAGNET CLUTCH CONTROL
When A/C switch or DEF switch is pressed, front air control inputs compressor ON signal to BCM. BCM sends compressor ON signal to ECM and front air control, via CAN communication line.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant pressure sensor signal, throttle angle sensor, etc.). If it judges compressor can be turned ON, it sends compressor ON signal to IPDM E/R, via CAN communication line.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate compressor.