Mode Door Motor Circuit
Mode Door Motor CircuitSYMPTOM:
- Air outlet does not change.
- Mode door motor does not operate normally.
Step 1-3:
Step 3 (Continued)-5:
INSPECTION FLOW
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
- Front air control
- Mode door motor (LCU)
System Operation
The front air control receives signals from its various dials and switches. The front air control then sends air mix door, mode door and intake door motor opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU.
The mode door motor reads 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
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.
DIAGNOSTIC PROCEDURE
SYMPTOM: Mode door motor and/or air mix door motor does not operate normally.
Perform diagnostic procedure for LAN system circuit. Refer to MTC-41, "LAN System Circuit". LAN System Circuit