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.

CHECK AIR MIX DOOR MOTOR LH COMMUNICATION SIGNAL

Turn ignition switch ON.

Check output waveform between air mix door motor LH harness connector and ground with oscilloscope.

(+)		(-)	Output waveform
Air mix door motor LH
Connector	Terminal
M228	3	Ground	Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES

GO TO 2 .

GO TO 3 .

CHECK INSTALLATION OF AIR MIX DOOR MOTOR LH
Check air mix door motor LH is properly installed. Refer to Exploded View .

Is the inspection result normal?

YES

Replace air mix door motor LH. Refer to Removal and Installation - Air Mix Door Motor LH .

NO

Repair or replace malfunctioning part.

CHECK AIR MIX DOOR MOTOR LH COMMUNICATION SIGNAL CIRCUIT

Turn ignition switch OFF.
Disconnect air mix door motor LH connector and A/C auto amp. connector.

Check continuity between air mix door motor LH harness connector and A/C auto amp. harness connector.

Air mix door motor LH		A/C auto amp.		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M228	3	M137	16	Yes

Is the inspection result normal?

YES

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

Repair harness or connector.