Air Mix Door Motor Circuit
Air Mix Door Motor CircuitSYMPTOM:
- Discharge air temperature does not change.
- Air mix door motor does not operate.
Inspection Flow:
INSPECTION FLOW
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
- Display and A/C auto amp.
- Air mix door motor (LCU)
- A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)
- In-vehicle sensor
- Ambient sensor
- Sunload sensor
- Intake sensor
System Operation
The display and A/C auto amp. receives data from each of the sensors. The display and A/C auto amp. sends air mix door, mode door and intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the display and 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 FRESH/RECIRCULATION operation is selected. The new selection data is returned to the display and A/C auto amp.
Air Mix Door Control Specification
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor is attached to the heater & cooling unit. It rotates so that the air mix door is opened or closed to a position set by the display and A/C auto amp. Motor rotation is then sent conveyed through a shaft and the air mix door position feedback is then sent to the display and A/C auto amp. by PBR built-in air mix door motor.
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnosis procedure. Refer to ATC-65, "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT". LAN System Circuit