With 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.


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.