Air Mix Door Motor Circuit

TROUBLE DIAGNOSIS PROCEDURE FOR AIR MIX DOOR (LAN)

Inspection Flow:

Inspection Flow (With Navigation System):

SYMPTOM:
* Discharge air temperature does not change.
* Air mix door motor does not operate.



SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
1. Auto amp.
2. Air mix door motor (LCU)
3. In-vehicle sensor
4. Ambient sensor
5. Sunload sensor
6. Intake sensor






System Operation
The auto amplifier receives data from each of the sensors. The amplifier sends air mix door and mode door opening angle data to the air mix door motor LCU and mode door motor LCU.

Air Mix Door Control Specification:

The air mix door motor and mode 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 operation is selected. The new selection data is returned to the auto amplifier






COMPONENT DESCRIPTION
The air mix door motor is attached to the heater unit. It rotates so that the air mix door is opened or closed to a position set by the auto amplifier. Motor rotation is then conveyed through a shaft and the air mix door position is then fed back to the auto amplifier by PBR built-in air mix door motor.






CONTROL LINKAGE ADJUSTMENT

Air Mix Door
1. Install air mix door motor on heater unit and connect it to main harness.
2. Set up code No. 41 in Self-diagnosis STEP 4. Refer to "Step-by-step Procedure (Without Navigation System)" or "Step-by-step Procedure (With Navigation System)".

3. Move air mix door lever by hand and hold it in full cold position.
4. Attach air mix door lever to rod holder.






5. Make sure air mix door operates properly when changing from code No. [41] to [46] by pushing DEF switch.