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 control 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 is 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 (defroster and floor) switch setting.
MODE DOOR CONTROL
The mode door is controlled by the position of the mode dial.
DEFROSTER DOOR CONTROL
The defroster door is controlled by the mode dial (set to defroster).
MAGNET CLUTCH CONTROL
Compressor can only operate with engine running and blower ON (speed 1-4).
When the A/C switch is pressed, or the mode switch is turned to the defroster position, the front air control outputs a compressor ON signal to BCM.
The BCM then sends a compressor ON signal to ECM, 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.