Inspection For Power Supply And Ground Circuit

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE

Check for blown rear sonar system fuse.

SONAR CONTROL UNIT FUSE DESCRIPTION

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
1. Disconnect sonar control unit connector.
2. Check voltage between sonar control unit connector B56 terminal 8 (G/R) and ground.
  
  Fig 1: Sonar Control Unit Connector B56 Terminal 8 (G/R) And Ground Voltage Specification Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Voltage Between Sonar Control Unit Connector B56 Terminal 8 (G/R) 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
1. Turn ignition switch OFF.
2. Check continuity between sonar control unit B56 terminal 6 and ground.
  
  Fig 3: Sonar Control Unit B56 Terminal 6 And Ground Continuity Specification Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: 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: Check harness ground circuit.