Air Mix Door Motor

AIR MIX DOOR MOTOR


Description


SYSTEM DESCRIPTION

Component Parts

Air mix door control system components are:
- Front air control
- Air mix door motor (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 LCUs 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.





AIR MIX DOOR MOTOR


Diagnosis Procedure


SYMPTOM:
- Discharge air temperature does not change.
- Air mix door motor does not operate.

INSPECTION FLOW
1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE INCREASE
1. Turn the temperature control dial clockwise to maximum heat.
2. Check for hot air at discharge air outlets.
- GO TO 2
2. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE DECREASE
1. Turn the temperature control dial counterclockwise to maximum cold.
2. Check for cold air at discharge air outlets.
Can a symptom be duplicated?
YES - Inspection End.
NO - Go to diagnosis procedure for LAN system. Refer to LAN System Circuit.