Power Supply and Ground Circuit Check for Display Control 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 FUSE

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

FUSE SPECIFICATION

Terminals		Power source	Fuse No.
Connector	Terminal (Wire color)
M94	1 (Y/R)	Battery power	19
	10 (V)	ACC power	4

OK or NG

OK: GO TO 2.
NG: If fuse is blown, be sure to eliminate case of malfunction before installing new fuse.

CHECK POWER SUPPLY CIRCUIT

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

VOLTAGE SPECIFICATION

Terminals			Ignition switch position
(+)		(-)	OFF	ACC	ON
Connector	Terminal (Wire color)
M94	1 (Y/R)	Ground	Battery voltage	Battery voltage	Battery voltage
	10(V)		0V	Battery voltage	Battery voltage

OK or NG

OK: GO TO 3.
NG: Check harness for open or short between display control unit and fuse.

Fig 1: Checking Voltage Between Connector Terminals And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK GROUND CIRCUIT

Check continuity between the following display control unit and ground.

CONTINUITY SPECIFICATION

Terminals			Ignition switch	Continuity
(+)		(-)
Connector	Terminal (Wire color)
M94	3 (B)	Ground	OFF	Yes

OK or NG

OK: INSPECTION END.
NG: Repair or replace harness.

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