DISPLAY CONTROL UNIT : Diagnosis Procedure

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

CHECK FUSE

Make sure the following fuses of the display control unit are not blown.

CONNECTOR TERMINAL SIGNAL CHART

Connector	Terminal	Signal name	Fuse No.
M94	1	Battery	31
	10	ACC/ON	4
	12	ON/START	4

Are fuses OK?

Yes: GO TO 2.

No: If fuse is blown, be sure to eliminate cause of blown fuse before installing new fuse.

CHECK POWER SUPPLY CIRCUIT

Disconnect display control unit connector M94.
Check voltage between connector terminals and ground as follows.

IGNITION SWITCH POSITION CHART

Terminals			Ignition switch position
(+)		(-)	OFF	ACC	ON
Connector	Terminal	(-)	OFF	ACC	ON
M94	1	Ground	Battery voltage	Battery voltage	Battery voltage
	10		0V	Battery voltage	Battery voltage
	12		0V	0V	Battery voltage

Fig 1: Checking Voltage Between Connector Terminals And Ground

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

Are voltage readings as specified?

Yes: GO TO 3.

No: Check harness for open between display control unit and fuse.

CHECK GROUND CIRCUIT

Check continuity between the following display control unit connector terminals and ground.

TERMINAL CONTINUITY CHART

Terminals			Ignition switch	Continuity
Connector	Terminal	-	Ignition switch	Continuity
M94	3	Ground	OFF	Yes

Fig 2: Checking Continuity Between Display Control Unit Connector Terminals And Ground

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

Is continuity present?

Yes: Inspection End.

No: Repair or replace harness.