Mode Door Motor Circuit

SYMPTOM:
- Air outlet does not change.
- Mode door motor does not operate normally.

Inspection Flow:

SYSTEM DESCRIPTION

Component Parts
Mode door control system components are:
- Auto amp.
- Mode door motor (LCU)
- In-vehicle sensor
- Ambient sensor
- Sunload sensor
- Intake sensor




System Operation
The auto amplifier receives data from each of the sensors. The amplifier 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 auto amplifier 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 auto amplifier.




Mode Door Control Specification

COMPONENT DESCRIPTION




Mode Door Motor
The mode door motor is attached to the heater and cooling unit. It rotates so that air is discharged from the outlet set by the auto amplifier. 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 "LAN System Circuit".

MODE DOOR




1. Install mode door motor on heater unit and connect it to main harness.
2. Set up code No. in Self-diagnosis STEP 4. Refer to "Self-diagnosis". Self-Diagnosis Cannot Be Performed
3. Move side link by hand and hold mode door in DEF mode.
4. Attach mode door motor rod to side link rod holder.




5. Make sure mode door operates properly when changing from code No. 41 to 46 by pushing DEF switch.