Power Supply and Ground Circuit Check for NAVI Control Unit

WARNING: This page is about a different car, the 2005 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 NAVI control unit are not blown.

TERMINAL AND FUSE REFERENCE

Terminals		Power source	Fuse No.
Connector	Terminal (Wire color)	Power source	Fuse No.
B151	2 (Y), 3 (Y)	Battery power	31
B151	6 (O)	ACC power	4

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 NAVI control unit connector B151.
Check voltage between connector terminals and ground as follows.

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

VOLTAGE BETWEEN CONNECTOR TERMINALS AND GROUND

Terminals			Ignition switch position
(+)		(-)	OFF	ACC	ON
Connector	Terminal (Wire color)	(-)	OFF	ACC	ON
B151	2 (Y), 3 (Y)	Ground	Battery voltage	Battery voltage	Battery voltage
B151	6 (O)	Ground	0V	Battery voltage	Battery voltage

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 connector terminals and ground.

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

CONTINUITY BETWEEN NAVI CONTROL UNIT CONNECTOR TERMINALS AND GROUND

Terminals			Ignition switch	Continuity
Connector	Terminal (Wire color)	-	Ignition switch	Continuity
B151	1 (B), 4 (B)	Ground	OFF	Yes

OK or NG

OK: Inspection End.
NG: Repair or replace harness.