Diagnostic Procedure For LAN Circuit

WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK POWER SUPPLY FOR UNIFIED METER AND A/C AMP. SIDE
1. Turn ignition switch ON.
2. Check voltage between unified meter and A/C amp. harness connector M89 terminal 54 and ground.
  54 - Ground: Battery voltage
Fig 1: Checking Voltage Between Unified Meter And A/C Amp. Harness Connector M89 Terminal 54 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 2.

NG: Replace unified meter and A/C amp. Refer to "UNIFIED METER AND A/C AMP .".

CHECK SIGNAL FOR UNIFIED METER AND A/C AMP. SIDE

Confirm A/C LAN signal between unified meter and A/C amp. harness connector M89 terminal 43 and ground using an oscilloscope.

SIGNAL FOR UNIFIED METER AND A/C AMP. SIDE

Terminals			Voltage
(+)		(-)
Unified meter and A/Camp, connector	Terminal No.	(-)
M89	43	Ground	Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking A/C LAN Signal Between Unified Meter And A/C Amp. Harness Connector M89 Terminal 43 And Ground

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

OK or NG

OK: GO TO 3.

NG: Replace unified meter and A/C amp. Refer to "UNIFIED METER AND A/C AMP .".

CHECK POWER SUPPLY FOR INOPERATIVE DOOR MOTOR
Check voltage between inoperative door motor harness connector terminal 1 and ground.

1 - Ground: Battery voltage

Fig 3: Checking Voltage Between Inoperative Door Motor Harness Connector Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 4.

NG: Repair harness or connector.

CHECK SIGNAL SIDE FOR INOPERATIVE DOOR MOTOR

Confirm A/C LAN signal between inoperative door motor harness connector terminal 3 and ground using an oscilloscope.

SIGNAL SIDE FOR INOPERATIVE DOOR MOTOR

Door motor	Terminals			Voltage
	(+)		(-)
	Connector	Terminal No.	(-)
Mode	M40	3	Ground	Courtesy of NISSAN MOTOR CO., U.S.A.
Air mix (Driver)	M39	3
Air mix (Passenger)	M87	3
Intake	M58	3

Fig 4: Checking A/C LAN Signal Between Inoperative Door Motor Harness Connector Terminal 3 And Ground

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

OK or NG

OK: GO TO 5.

NG: Repair harness or connector.

CHECK INOPERATIVE DOOR MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect inoperative door motor connector.
3. Check continuity between inoperative door motor harness connector terminal 2 and ground.
  2 - Ground: Continuity should exist .
Fig 5: Checking Continuity Between Inoperative Door Motor Harness Connector Terminal 2 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK:
- Replace mode door motor if inoperative. Refer to "MODE DOOR MOTOR ".
- Replace intake door motor if inoperative. Refer to "MODE DOOR MOTOR ".
- Replace driver side air mix door motor if inoperative. Refer to "DRIVER SIDE AIR MIX DOOR MOTOR ".
- Replace passenger side air mix door motor if inoperative. Refer to "PASSENGER SIDE AIR MIX DOOR MOTOR ".
NG: Repair harness or connector.