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 (PASSENGER SIDE) POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between air mix door motor (passenger side) harness connector M129 terminal 1 and ground.
  1 - Ground :Battery Voltage
Is the inspection result normal?

YES: GO TO 2.

NO: Repair the harnesses or connectors.

Fig 1: Checking Voltage Between Air Mix Door Motor (Passenger Side) Harness Connector M129 Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK SIGNAL FOR AIR MIX DOOR MOTOR (PASSENGER SIDE)

Check the output waveform (LAN signal) between air mix door motor (passenger side) harness connector M129 terminal 3 and ground using an oscilloscope.

TERMINAL VOLTAGE CHART

(+)		(-)	Voltage
Air mix door motor (passenger side)		-
Connector	Terminal	-
M129	3	Ground	Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking Waveform (LAN Signal) Between Air Mix Door Motor (Passenger Side) Harness Connector M129 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 (PASSENGER SIDE) GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect air mix door motor (passenger side) connector.
3. Check continuity between air mix door motor (passenger side) harness connector M129 terminal 2 and ground.
  2 - Ground: Continuity should exist.
  
  Fig 3: Checking Continuity Between Air Mix Door Motor (Passenger Side) Harness Connector M129 Terminal 2 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
Is the inspection result normal?

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

NO: Repair harness or connector.