Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK AIR MIX DOOR MOTOR (DRIVER SIDE) POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between air mix door motor (driver side) harness connector M128 terminal 1 and ground.
  1 - Ground: Battery Voltage
  
  Fig 1: Checking Voltage Between Air Mix Door Motor (Driver Side) Harness Connector M128 Terminal 1 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
Is the inspection result normal?

YES: GO TO 2.

NO: Repair the harnesses or connectors.

CHECK SIGNAL FOR AIR MIX DOOR MOTOR (DRIVER SIDE)

Check the output waveform (LAN signal) between air mix door motor (driver side) harness connector M128 terminal 3 and ground using an oscilloscope.

TERMINAL VOLTAGE CHART

(+)		(-)	Voltage
Air mix door motor (driver side)		-
Connector	Terminal	-
M128	3	Ground	Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking Waveform (LAN Signal) Between Air Mix Door Motor (Driver Side) Harness Connector M128 Terminal 3 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

Is the inspection result normal?

YES: GO TO 3.

NO: Repair the harnesses or connectors.

CHECK AIR MIX DOOR MOTOR (DRIVER SIDE) GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect air mix door motor (driver side) connector.
3. Check continuity between air mix door motor (driver side) harness connector M128 terminal 2 and ground.
  2 - Ground: Continuity should exist.
Is the inspection result normal?

YES: Replace air mix door motor (driver side). Refer to "AIR MIX DOOR MOTOR: REMOVAL AND INSTALLATION ".

NO: Repair harness or connector.

Fig 3: Checking Continuity Between Air Mix Door Motor (Driver Side) Harness Connector M128 Terminal 2 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.