Mode Door Motor
MODE DOOR MOTOR
Description
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
- Front air control
- Mode 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
Mode Door Motor
The mode door motor (1) is attached to the heater and cooling unit assembly. It rotates so that air is discharged from the outlet set by the front air control. Motor rotation is conveyed to a link which activates the mode door.
MODE DOOR MOTOR
Diagnosis Procedure
SYMPTOM: Mode door motor and/or air mix door motor does not operate normally.
Perform diagnostic procedure for LAN system circuit. Refer to LAN System Circuit.
SYMPTOM:
- Air outlet does not change.
- Mode door motor does not operate normally.
INSPECTION FLOW
1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - DISCHARGE AIR
1. Press each of the four mode position switches and then press the (DEF) switch. Each position indicator should illuminate.
2. Confirm that discharge air comes out according to the air distribution table. Refer to System Description.
NOTE:
Confirm that the compressor clutch is engaged (visual inspection and intake door position is at (FRESH) when (DEF) or (D/F) is selected.
Is the inspection result normal?
YES - Inspection End.
NO - Go to diagnosis procedure for LAN system. Refer to LAN System Circuit.