Intake Door Motor Circuit

TROUBLE DIAGNOSIS


Intake Door Motor Circuit


SYMPTOM
- Intake door does not change.
- Intake door motor does not operate normally.

INSPECTION FLOW






SYSTEM DESCRIPTION

Component Parts

Intake door control system components are:
- Unified meter and A/C amp.
- Intake door motor (LCU)
- A/C LAN system (PBR built-in mode door motor, upper ventilator door motor, air mix door motor and intake door motor)
- In-vehicle sensor
- Ambient sensor
- Sunload sensor
- Intake sensor

System Operation
The intake door control determines 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 unified meter and A/C amp. sets the intake door at the FRE position.





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.

COMPONENT DESCRIPTION

Intake Door Motor
The intake door motor is attached to the blower unit. It rotates so that air is drawn from inlets set by the unified meter and A/C amp. Motor rotation is conveyed to a lever which activates the intake door.






DIAGNOSIS PROCEDURE FOR INTAKE DOOR MOTOR
SYMPTOM: Intake door motor does not operate normally.
Perform diagnosis procedure. Refer to LAN System Circuit.