The intake doors are automatically controlled by the temperature setting, ambient temperature, in-vehicle temperature, intake temperature, amount of sunload and ON/OFF operation of the compressor. SYSTEM OPERATION

- The A/C auto amp. receives data from each of the sensors.
- The A/C auto amp. sends air mix door, mode door and intake door opening angle data to the air mix door motor LCUs, mode door motor LCU and intake door motor LCU.
- The air mix door motors, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the A/C auto amp. and each of the motor position sensors are compared by the LCUs in each door motor with the existing decision and opening angles.
- Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection data are returned to the A/C auto amp.
- The intake door control judges intake door position based on the ambient temperature, the intake air temperature and the in-vehicle temperature. When shifting mode position D/F, when the DEF or OFF switches are pressed, or when A/C switch is OFF, the A/C auto amp. sets the intake door at the FRE position.

Door Motor Circuit
INTAKE DOOR CONTROL SPECIFICATION

- Intake door position is basically fixed at FRE when FRE indicator of FRE switch is ON or DEF switch is ON.
- Intake door position is basically fixed at REC when REC indicator of REC switch is ON.
- Intake door automatic control selects FRE, 20 – 80% FRE, or REC depending on a target air mix door opening angle, based on in-vehicle temperature, ambient temperature, and sunload amount.