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Check BCM Power Supply and Ground Circuit

  1. CHECK FUSES AND FUSIBLE LINK

    Check for blown fuses and fusible link.

    FUSES AND FUSIBLE LINK LIST

    Unit Power source Fuse and fusible link No.
    BCM Battery F
    21
    Ignition switch ON or START position 1
    Ignition switch ACC or ON position 6

    Refer to "Wiring Diagram - TAIL/L - ".

    OK or NG 

    OK: GO TO 2.

    NG: If fuse or fusible link is blown, be sure to eliminate cause of malfunction before installing new fuse or fusible link. 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 REFERENCE CHART

      Terminal Ignition switch position
      (+) (-) OFF ACC ON
      BCM connector Terminal
      M1 11 Ground Approx. 0 V Battery voltage Battery voltage
      38 Approx. 0 V Approx. 0 V Battery voltage
      M2 42 Battery voltage Battery voltage Battery voltage
      55 Battery voltage Battery voltage Battery voltage

      OK or NG 

      OK: GO TO 3.

      NG: Repair harness or connector.

      Fig 1: Checking Voltage Between BCM Harness Connector And Ground
      G05221980Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK GROUND CIRCUIT

    Check continuity between BCM harness connector and ground.

    CONTINUITY REFERENCE CHART

    Terminal Continuity
    BCM connector Terminal Ground Yes
    M2 52

    OK or NG 

    OK: INSPECTION END

    NG: Repair harness or connector.

    Fig 2: Checking Continuity Between BCM Harness Connector And Ground
    G05214869Courtesy of NISSAN MOTOR CO., U.S.A.
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