Upper Ventilator Door Motor Circuit

TROUBLE DIAGNOSIS


Upper Ventilator Door Motor Circuit


SYMPTOM
- Upper ventilator outlet does not change.
- Upper ventilator door motor does not operate normally.

INSPECTION FLOW











SYSTEM DESCRIPTION

Component Parts

Upper ventilator door control system components are:
- Unified meter and A/C amp.
- Upper ventilator 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)
- Sunload sensor

System Operation
- The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp. sends air mix door, mode door, upper ventilator door and intake door opening angle data to the air mix door motor LCUs, mode door motor LCUs, upper ventilator door motor LCU and intake door motor LCU.
- The air mix door motors, mode door motors, upper ventilator door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the unified meter and A/C 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, OPEN/SHUT and FRE/REC operation is selected. The new selection data are returned to the unified meter and A/C amp.






Upper Ventilator Door Control Specification






COMPONENT DESCRIPTION

Upper Ventilator Door Motor





The upper ventilator door motor is attached to the heater & cooling unit assembly. It rotates so that air is discharged from the outlet set by the unified meter and A/C amp. Motor rotation is conveyed to a rod which activates the upper ventilator door.

DIAGNOSIS PROCEDURE FOR UPPER VENTILATOR DOOR MOTOR
SYMPTOM: Upper ventilator door motor does not operate normally.
Perform diagnosis procedure. LAN System Circuit.