Inspection For Power Supply And Ground Circuit

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

CHECK FUSES

Check for blown rear sonar system fuses.

FUSES CHECK

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.

POWER SUPPLY CIRCUIT

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

Fig 1: Checking Voltage Between Sonar Control Unit Connector B56 Terminal 8 And Ground

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

OK or NG

OK: GO TO 3.

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

CHECK GROUND CIRCUIT

Turn ignition switch OFF.
Check continuity between sonar control unit connector B56 terminal 6 and ground.

GROUND CIRCUIT

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

Fig 2: Checking Continuity Between Sonar Control Unit B56 Terminal 6 And Ground

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

OK or NG

OK: Inspection End.

NG: Repair harness or connector.