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BCM Power Supply and Ground Circuit Check

WARNING: This page is about a different car, the 2005 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FUSE 

    Check the following BCM fuses and fusible link.

    BCM COMPONENT PARTS AND TERMINALS REFERENCE

    Component Parts Terminal No. (SIGNAL) Ampere No. Location
    BCM 57 (BAT power supply) 15A 22 Fuse block (J/B)
    70 (BAT power supply) 50A f Fuse and fusible link box
    11 (ACC power supply) 10A 4 Fuse block (J/B)
    38 (IGN power supply) 10A 59 Fuse and relay box
    NOTE: Refer to "COMPONENT PARTS AND HARNESS CONNECTOR LOCATION ".

    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 ".
  2. CHECK POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect BCM.
    3. Check voltage between BCM connectors M18, M20 terminals 11, 38, 57, 70 and ground.
      Fig 1: Checking Voltage Between BCM Connectors M18, M20 Terminals 11, 38, 57, 70 And Ground
      G03599946Courtesy of NISSAN MOTOR CO., U.S.A.
      VOLTAGE BETWEEN BCM CONNECTORS M18, M20 TERMINALS 11, 38, 57, 70 AND GROUND REFERENCE

      Connector Terminals (Wire color) Signal name Ignition switch Voltage
      (+) (-)
      M20 70 (W/B) Ground Battery power supply OFF Battery voltage
      57 (Y/R) Battery power supply OFF Battery voltage
      M18 11 (O) ACC power supply ACC Battery voltage
      38 (W/L) IGN power supply ON Battery voltage

    OK or NG

    • OK : GO TO 3.
    • NG : Repair or replace harness.
  3. CHECK GROUND CIRCUIT 

    Check continuity between BCM connector M20 terminal 67 and ground.

    Fig 2: Checking Continuity Between BCM Connector M20 Terminal 67 And Ground
    G03599947Courtesy of NISSAN MOTOR CO., U.S.A.
    CONTINUITY BETWEEN BCM CONNECTOR M20 TERMINAL 67 AND GROUND REFERENCE

    Connector Terminals (Wire color) Continuity
    (+) (-)
    M20 67 (B) Ground Yes

    OK or NG

    • OK : Power supply and ground circuit is OK.
    • NG : Repair or replace harness.
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