Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

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

CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL

Turn ignition switch ON.
Check output waveform between A/C auto amp. harness connector and ground with oscilloscope.

(+)		(-)	Output waveform
A/C auto amp.
Connector	Terminal
M137	16	Ground	Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES

GO TO 2 .

GO TO 3 .

CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT FOR OPEN

Turn ignition switch OFF.
Disconnect A/C auto amp. connector and intake door motor connector.

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	Continuity
M137	16	M227	3	Yes

Is the inspection result normal?

YES

Inspection End.

Repair harness or connector.

CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT FOR SHORT

Disconnect following connectors:
- Air mix door motor LH
- Air mix door motor RH
- Mode door motor

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

A/C auto amp.		(-)	Continuity
Connector	Terminal
M137	16	Ground	No

Is the inspection result normal?

YES

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

Repair harness or connector.