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Check Power Supply And Ground Circuit

  1. CHECK FUSES 

    Check for blown fuses.

    POWER SOURCE UNIT CHART

    Unit Power source Fuse and fusible link No.
    BCM Battery M
    22
    Ignition switch ON or START position 1
    Ignition switch ACC or ON position 6
    IPDM E/R Battery 71
    Rear combination lamp control unit Battery 20

    Refer to "WIRING DIAGRAM - TAIL/L - ".

    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 ".

  2. CHECK POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect BCM connector.
    3. Check voltage between BCM harness connector and ground.
      VOLTAGE SPECIFICATION

      (+) (-) Ignition switch position
      BCM connector Terminal OFF ACC ON
      M3 11 Ground Approx. 0 V Battery voltage Battery voltage
      38 Approx. 0 V Approx. 0 V Battery voltage
      M4 42 Battery voltage Battery voltage Battery voltage
      55 Battery voltage Battery voltage Battery voltage
      Fig 1: Identifying Voltage Between BCM Harness Connector And Ground
      G04078330Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK : GO TO 3.

    NG : Repair harness or connector.

  3. CHECK GROUND CIRCUIT 

    Check continuity between BCM harness connector and ground.

    TERMINALS AND REFERENCE VALUES CHART

    BCM connector Terminal   Continuity
    M4 49 Ground Yes
    52
    Fig 2: Identifying Continuity Between BCM Harness Connector And Ground
    G04078331Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK : INSPECTION END

    NG : Repair harness or connector.

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