Air Mix Door Motor Circuit
AIR MIX DOOR MOTORDescription
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
- Front air control
- Air mix door motors (LCU)
System Operation
The front air control receives user inputs through its various dials and switches. The front air control 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 front air control and each of the motor position sensors are compared by the LCU's in each motor with the existing decision and opening angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the front air control.
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor (1) is attached to the heater & cooling unit assembly. It rotates so that the air mix door is opened or closed to a position set by the front air control. Motor rotation is then conveyed through a shaft and the air mix door position feedback is then sent to the front air control by PBR built-in air mix door motor.
Diagnosis Procedure
SYMPTOM:
- Discharge air temperature does not change.
- Air mix door motor does not operate.
INSPECTION FLOW
Step 1-8:
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnosis procedure. Refer to HAC-116, "Diagnosis Procedure". LAN System Circuit