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Power Supply And Ground Circuit Check

WARNING: This page is about a different car, the 2004 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FUSE 

    Check if any of the following fuses in the BCM are blown.

    FUSE SPECIFICATION CHART

    Unit Power source Fuse No.
    BCM Battery power supply F (50A)
    18 (10A)
    Ignition switch ON or START signal 1 (10A)
    Ignition switch ACC or ON signal 6 (10A)
    NOTE: Refer to "COMPONENT PARTS AND HARNESS CONNECTOR LOCATION ".

    OK or NG

    1. OK: GO TO 2.
    2. NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to POWER DISTRIBUTION .
  2. CHECK POWER SUPPLY CIRCUIT (BCM) 
    1. Turn ignition switch OFF.
    2. Disconnect BCM connector.
    3. Check voltage between BCM connector and ground.
      VOLTAGE CHECK CHART

      Connector Terminals (Wire color) Power source Condition Voltage (V) (Approx)
      (+) (-)
      M34 11 (P/B) Ground ACC power supply Ignition switch ACC Battery voltage
      38 (R) Ignition power supply Ignition switch ON
      M35 42 (GR), 55 (W/B) Battery power supply Ignition switch OFF
      Fig 1: Checking Voltage Between BCM Connector And Ground
      G03497688Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 3.
    2. NG: Repair or replace the harness between BCM and fuse.
  3. CHECK GROUND CIRCUIT (BCM) 
    1. Turn ignition switch OFF.
    2. Check continuity between BCM connector M35 terminal 49 (B), 52 (B) and ground.

      49 (B) - Ground: Continuity should exist. 

      52 (B) - Ground: Continuity should exist. 

    OK or NG

    1. OK: BCM circuit is OK. Check the driver seat control unit. GO TO 4.
    2. NG: Repair or replace the harness between BCM and ground.
      Fig 2: Checking Continuity Between BCM Connector M35 Terminal 49, 52 And Ground
      G03497689Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK FUSE 

    Make sure any of the following fuse in the driver seat control unit and automatic drive positioner control unit are blown.

    FUSE SPECIFICATION CHART

    Unit Power source Fuse No.
    Driver seat control unit Ignition switch START signal 9 (10A)
    Battery power supply 21 (10A)
    NOTE: Refer to "COMPONENT PARTS AND HARNESS CONNECTOR LOCATION ".

    OK or NG

    1. OK: GO TO 5.
    2. NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to POWER DISTRIBUTION .
  5. CHECK POWER SUPPLY CIRCUIT (DRIVER SEAT CONTROL UNIT) 
    1. Disconnect driver seat control unit connector.
    2. Check voltage between driver seat control unit connector and ground.
      VOLTAGE CHECK CHART

      Connector Terminals (Wire color) Power source condition Voltage (V) (Approx)
      (+) (-)
      B303 33 (R), 40 (W/B) Ground Battery power supply Ignition switch OFF Battery voltage
      6 (Y/G) START power supply Ignition switch START
      Fig 3: Checking Voltage Between Driver Seat Control Unit Connector And Ground
      G03497690Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 6.
    2. NG: Repair or replace harness between driver seat control unit and fuse block (J/B).
  6. CHECK GROUND CIRCUIT (DRIVER SEAT CONTROL UNIT) 
    1. Turn ignition switch OFF.
    2. Check continuity between the driver seat control unit connector B303 terminal 32 (B/W), 48 (B) and ground.

      32 (B/W) - Ground: Continuity should exist. 

      48 (B) - Ground: Continuity should exist. 

    OK or NG

    1. OK: Driver seat control unit circuit check is OK, GO TO 7.
    2. NG: Repair or replace harness between driver seat control unit and ground.
      Fig 4: Checking Continuity Between Driver Seat Control Unit Connector B303 Terminal 32, 48 And Ground
      G03497691Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK POWER SUPPLY CIRCUIT (AUTOMATIC DRIVE POSITIONER CONTROL UNIT) 
    1. Disconnect automatic drive positioner control unit connector.
    2. Check voltage between automatic drive positioner control unit connector M20 terminal 34 (Y/R), 39 (W/R) and ground.

      34 (Y/R) - Ground: Battery voltage 

      39 (W/R) - Ground: Battery voltage 

    OK or NG

    1. OK: GO TO 8.
    2. NG: Repair or replace harness between driver seat control unit and fuse block (J/B).
      Fig 5: Checking Voltage Between Automatic Drive Positioner Control Unit Connector M20 Terminal 34, 39 And Ground
      G03497692Courtesy of NISSAN MOTOR CO., U.S.A.
  8. CHECK GROUND CIRCUIT (AUTOMATIC DRIVE POSITIONER CONTROL UNIT) 

    Check continuity between the automatic drive positioner control unit connector M20 terminal 40 (B), 48 (B) and ground.

    40 (B) - Ground: Continuity should exist. 

    48 (B) - Ground: Continuity should exist. 

    OK or NG

    1. OK: Automatic drive positioner control unit circuit is OK.
    2. NG: Repair or replace harness between automatic drive positioner control unit and ground.
      Fig 6: Checking Continuity Between Automatic Drive Positioner Control Unit Connector M20 Terminal 40, 48 And Ground
      G03497693Courtesy of NISSAN MOTOR CO., U.S.A.
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