DTC Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FRONT AIR MIX DOOR MOTOR POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between air mix door motor harness connector M147 terminal 1 and ground.
1 - Ground

: Battery Voltage

Is the inspection result normal?

YES

GO TO 2.

NO

Repair the harnesses or connectors.

CHECK SIGNAL FOR FRONT AIR MIX DOOR MOTOR

Check the output waveform (LAN signal) between front air mix door motor harness connector M147 terminal 3 and ground using an oscilloscope.

(+)		(-)	Voltage
Front air mix door motor		--
Connector	Terminal
M147	3	Ground	Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES

GO TO 3.

Repair the harnesses or connectors.

CHECK FRONT AIR MIX DOOR MOTOR GROUND CIRCUIT

Turn ignition switch OFF.
Disconnect front air mix door motor connector.

Check continuity between front air mix door motor harness connector M147 terminal 2 and ground.

2 - Ground

: Continuity should exist.

Is the inspection result normal?

YES

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

Repair harness or connector.