Power Supply and Ground Circuit Check for Display Control Unit

WARNING: This page is about a different car, the 2007 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	Power source	Fuse No.
M94	1	Battery power	19
	10	ACC power	4
	12	Ignition switch ON or START	12

OK or NG

OK: GO TO 2.

NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to "POWER SUPPLY ROUTING CIRCUIT ".

CHECK POWER SUPPLY CIRCUIT

Disconnect display control unit connector M94.

Check voltage between connector terminals and ground as follows.

TERMINALS VOLTAGE 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

OK or NG

OK: GO TO 3.

NG: Check harness for open between display control unit and fuse.

CHECK GROUND CIRCUIT

Turn ignition switch OFF.

Check continuity between the following display control unit terminal and ground.

TERMINALS CONTINUITY CHART

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

OK or NG

OK: Inspection End.

NG: Repair or replace harness.

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