Mode Door Motor Circuit
Mode Door Motor CircuitSYMPTOM:
- Air outlet does not change.
- Mode door motor does not operate normally.
Inspection Flow:
INSPECTION FLOW
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
- Unified meter and A/C amp.
- Mode door motor (LCU)
- A/C LAN system (PBR built-into mode motor and air mix motor)
- In-vehicle sensor
- Ambient sensor
- Sunload sensor
- Intake 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 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 unified meter and A/C amp. 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 unified meter and A/C amp.
Mode Door Control Specification
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater and 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 link which activates the mode door.
DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR
SYMPTOM: Mode door motor does not operate normally.
Perform diagnostic procedure for LAN circuit. Refer to ATC-55, "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT". LAN System Circuit