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 and 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
CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE INCREASE
Turn the temperature control dial clockwise to maximum heat.
Check for hot air at discharge air outlets. >> GO TO 2
CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE DECREASE
Turn the temperature control dial counterclockwise to maximum cold.
Check for cold air at discharge air outlets. Can a symptom be duplicated?