Power Supply and Ground Circuit Check for NAVI Control Unit

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

CHECK FUSES

Make sure the following fuses for the NAVI control unit are not blown.

FUSES SPECIFICATION

Terminals		Power source	Fuse No.
Connector	Terminal	Power source	Fuse No.
B504	2	Battery power	17
B504	5	ACC or ON power	4
B505	63	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 CIRCUITS

Disconnect NAVI control unit connectors.

Check voltage between connector terminals and ground as follows.

TERMINALS VOLTAGE CHART

Terminals			Ignition switch position
(+)		(-)	OFF	ACC	ON
Connector	Terminal	(-)	OFF	ACC	ON
B504 (A)	2	Ground	Battery voltage	Battery voltage	Battery voltage
B504 (A)	5		0V	Battery voltage	Battery voltage
B505 (B)	63		0V	0V	Battery voltage

Fig 1: Checking Voltage Between Connector Terminals And Ground

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

OK or NG

OK: GO TO 3.

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

CHECK GROUND CIRCUIT

Turn ignition switch OFF.

Check continuity between the following NAVI control unit terminals and ground.

TERMINALS CONTINUITY CHART

Terminals			Ignition switch	Continuity
Connector	Terminal	-	Ignition switch	Continuity
B504	1	Ground	OFF	Yes

OK or NG

OK: Inspection End.

NG: Repair or replace harness.

Fig 2: Checking Continuity Between Following NAVI Control Unit Terminals And Ground

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