370Z V6-3.7L (VQ37VHR) (2010)
Air Door Actuator / Motor: Testing and Inspection
Without 7 Inch Display
DOOR MOTOR COMMUNICATION CIRCUIT
Description
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LCU (Local Control Unit) is built in to each door motor. And detects door position by PBR (Potentio Balance Resistor).
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A/C auto amp. communicates with each LCU via communication line. And receives each door position feedback signal from each LCU.
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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.