Inspection For Power Supply And Ground Circuit

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

Check for blown rear sonar system fuse.

FUSES REFERENCE

UNIT	POWER SOURCE	FUSE
Sonar control unit	ON or START	12

Refer to "WIRING DIAGRAM - SONAR ".

OK or NG

OK: GO TO 2.

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

CHECK POWER SUPPLY CIRCUIT

Disconnect sonar control unit connector.

Check voltage between sonar control unit connector B56 terminal 8 and ground.

VOLTAGE CHART

Terminals			Ignition switch position
(+)		(-)	ON or START
Connector	Terminal	(-)	ON or START
B56	8	Ground	Battery voltage

OK or NG

OK: GO TO 3.

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

Fig 1: Checking Voltage Between Sonar Control Unit Connector Terminal 8 And Ground

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

CHECK GROUND CIRCUIT

Turn ignition switch OFF.

Check continuity between sonar control unit connector B56 terminal 6 and ground.

CONTINUITY REFERENCE CHART

Terminals			Continuity
(+)		(-)
Connector	Terminal	(-)
B56	6	Ground	Yes

OK or NG

OK: Inspection End.

NG: Repair harness or connector.

Fig 2: Checking Continuity Between Sonar Control Unit Terminal 6 And Ground

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