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Home >> Infiniti >> 2006 >> Q45 >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Wiper, Washer & Horn >> Front Wiper And Washer System (With Rain Sensor) >> Preliminary Check >> Check Power Supply And Ground Circuit

Check Power Supply And Ground Circuit

  1. CHECK FUSE 

    Check for blown fuses.

    FUSES INSPECTION

    Unit Power source Fuse No.
    BCM Battery 3
    Ignition switch ON or START 1

    Refer to , "WIRING DIAGRAM - WIPER - ".

    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 ".
  2. CHECK POWER SUPPLY CIRCUIT 
    1. Disconnect BCM connector.
    2. Check voltage between BCM harness connector and ground.
      BCM HARNESS CONNECTOR AND GROUND VOLTAGE

      Terminal Ignition switch position
      (+) (-) OFF ON
      Connector Terminal
      M4 105 Ground Battery voltage Battery voltage
      68 Approx. 0 V Battery voltage
      Fig 1: Checking Voltage Between BCM Harness Connector And Ground
      G04131359Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: GO TO 3.
    • NG: Repair harness or connector.
  3. CHECK GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Check continuity between BCM harness connector and ground.
      BCM HARNESS CONNECTOR AND GROUND CONTINUITY

      Terminal Continuity
      Connector  Terminal  Ground
      M4 56 Yes
      113

    OK or NG 

    • OK: INSPECTION END
    • NG: Repair harness or connector.
      Fig 2: Checking Continuity Between BCM Harness Connector And Ground
      G04131360Courtesy of NISSAN MOTOR CO., U.S.A.
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