Without 7 Inch Display

DOOR MOTOR COMMUNICATION CIRCUIT


Description






- LCU (Local Control Unit) is built in to each door motor. And detects door position by PBR (Potentio Balance Resistor).
- A/C auto amp. communicates with each LCU via communication line. And receives each door position feedback signal from each LCU.
- Each LCU control each door to the appropriate position depending on the control signal from A/C auto amp.
When the door movement was completed, transmits the signal of door movement completion to A/C auto amp.




DOOR MOTOR COMMUNICATION CIRCUIT


Diagnosis Procedure


NOTE:
If all of door motors DTC are detected, check this circuit.
1.CHECK COMMUNICATION SIGNAL
1. Turn the ignition switch ON.
2. Check output waveform between A/C auto amp. harness connector and ground with the oscilloscope.





Is the inspection result normal?
YES - GO TO 3.
NO - GO TO 2.
2.CHECK COMMUNICATION SIGNAL CIRCUIT FOR SHORT
1. Turn the ignition switch OFF.
2. Disconnect the following connectors:
- A/C auto amp.
- Mode door motor
- Intake door motor
- Air mix door motor
3. Check continuity between A/C auto amp. harness connector and ground.





Is the inspection result normal?
YES - Replace A/C auto amp.
NO - Repair the harnesses or connectors.
3.CHECK COMMUNICATION SIGNAL CIRCUIT FOR OPEN
1. Turn the ignition switch OFF.
2. Disconnect the A/C auto amp. and the mode door motor connectors.
3. Check continuity between A/C auto amp. harness connector and the mode door motor harness connector.





Is the inspection result normal?
YES - Replace A/C auto amp.
NO - Repair the harnesses or connectors.