Power Supply and Ground Circuit Check for Display Unit

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

CHECK 1: POWER SUPPLY CIRCUIT
1. Disconnect display unit connector.
2. Turn ignition switch ON.
3. Check voltage between display unit harness connector M93 terminals 2 (L/W), 3 (L/R) and ground.
1. Approx. 9 V
OK or NG
1. OK: GO TO 2.
2. NG: GO TO 3.
  
  Fig 1: Disconnecting Display Unit Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK GROUND CIRCUIT

Check continuity between display unit and ground as follows.

CONTINUITY SPECIFICATION

Terminals			Ignition switch	Continuity
(+)		(-)
Connector	Terminal (Wire color)
M93	1 (B)	Ground	OFF	Yes

OK or NG

OK: INSPECTION END.
NG: Repair harness.

Fig 2: Checking Continuity Between Display Unit And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK POWER SUPPLY CIRCUIT
Check voltage between display control unit harness connector M94 terminals 2 (L/W), 4 (L/R) and ground.
1. Approx. 9 V
OK or NG
1. OK: Repair harness.
2. NG: GO TO 4.
  
  Fig 3: Checking Voltage Between Display Control Unit Harness Connector M94 Terminals 2
  Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK HARNESS

Turn ignition switch OFF.
Disconnect display unit connector and display control unit connector.

Check continuity between display control unit harness connector M94 terminals 2 (L/W), 4 (L/R) and display unit harness connector M93 terminals 2 (L/W), 3 (L/R).

CONTINUITY SPECIFICATION

Terminals				Continuity
Display control unit (+)		Display unit (-)
Connector	Terminal (Wire color)	Connector	Terminal (Wire color)
M94	2 (L/W)	M93	2 (L/W)	Yes
	4 (L/R)		3 (L/R)

Check continuity between display unit and ground.

Fig 4: Checking Continuity Between Display Unit And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

CONTINUITY SPECIFICATION

Terminals			Continuity
Display unit (+)		(-)
Connector	Terminal (Wire color)
M93	2 (L/W)	Ground	No
	3 (L/R)

OK or NG

OK: Replace display control unit. Refer to REMOVAL AND INSTALLATION OF DISPLAY CONTROL UNIT .
NG: Repair harness.