Nissan Murano: Heater & Air Conditioning Control System :: Dtc/circuit Diagnosis / Door Motor Communication Circuit

Diagnosis Procedure

NOTE:

If all of door motor DTCs are detected, check this circuit.

CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL

1. Ignition switch ON.

2. Check output waveform between A/C auto amp. harness connector and ground with the oscilloscope.

   +		−		Output waveform
   A/C auto amp.
   Connector	Terminal
   M50	16	Ground

Is the inspection result normal?

GO TO 2.

GO TO 3.

CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT FOR OPEN

1. Ignition switch OFF.

2. Disconnect A/C auto amp. connector and intake door motor connector.

3. Check continuity between A/C auto amp. harness connector and intake door motor harness connector.

   A/C auto amp.		Intake door motor		Continuity
   Connector	Terminal	Connector	Terminal
   M50	16	M153	3	Yes

Is the inspection result normal?

Inspection End.

Repair harness or connector.

CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT FOR SHORT

1. Disconnect following connectors:

   • Air mix door motor LH

   • Air mix door motor RH

   • Mode door motor

2. Check continuity between A/C auto amp. harness connector and ground.

   A/C auto amp.		—		Continuity
   Connector	Terminal
   M50	16	Ground		No

Is the inspection result normal?

Replace A/C auto amp. Refer to Removal and Installation.

Repair harness or connector.