Control Operation

AIR CONDITIONER CONTROL

Description
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 switch.

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.

When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flowing.

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, 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.

SELF-DIAGNOSTIC SYSTEM
The self-diagnostic system is built into the front air control to quickly locate the cause of symptoms. Refer to "A/C System Self-diagnosis Function (With NAVI Only)".




Description of Control System




Control Operation

TEMPERATURE CONTROL DIAL (TEMPERATURE CONTROL)
Increases or decreases the set temperature.

RECIRCULATION () SWITCH
- When REC switch is ON, REC switch indicator turns ON, and air inlet is set to REC.
- When REC switch is turned OFF, or when compressor is turned from ON to OFF, REC switch is automatically turned OFF. REC mode can be re-entered by pressing REC switch again.
- REC switch is not operated when DEF switch is turned ON, at the D/F position, or in floor mode.

REAR WINDOW DEFOGGER SWITCH
When switch is ON, rear window is defogged.

OFF SWITCH (BLOWER SPEED SET TO 0)
The compressor and blower are OFF, the intake doors are set to the outside air position, and the air outlet doors are set to the foot position.

A/C SWITCH
The compressor is ON or OFF.

MODE CONTROL DIAL
Controls the air discharge outlets through control of the mode and defroster doors.

FRONT BLOWER CONTROL DIAL
Manually control the blower speed. Fourteen speeds are available for manual control.