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Check Power Supply And Ground

  1. CHECK FUSE 

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

    CHECK POWER SUPPLY AND GROUND

    Unit Terminal No. Power source Fuse/fusible link No.
    BCM 11 ACC or ON power supply 6 (10A)
    38 ON or START power supply 1 (15A)
    42 Battery power supply 22 (15A)
    55 Battery power supply M (50A)
    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 COMPONENT PARTS AND HARNESS CONNECTOR LOCATION .
  2. CHECK POWER SUPPLY CIRCUIT (BCM) 
    1. Disconnect BCM connector.
    2. Check voltage between BCM connector and ground.
    CHECK POWER SUPPLY CIRCUIT (BCM)

    Connector Terminals (Wire color) Power source Condition Voltage (V) (Approx.)
    (+) (-)
    M3 11 (LG/R) Ground ACC power supply Ignition switch ACC Battery voltage
    38 (W/L) Ground Ignition power supply Ignition switch ON Battery voltage
    B14 42 (L/R) 55 (G) Ground Battery power supply Ignition switch OFF Battery voltage
    Fig 1: Checking Power Supply Circuit (BCM)
    G03107567Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 3.
    2. NG: Check harness for open and short between BCM and fuse or fusible link.
  3. CHECK GROUND CIRCUIT (BCM) 
    1. Turn ignition switch OFF.
    2. Check continuity between BCM connector and ground.
    CHECK GROUND CIRCUIT (BCM)

    Connector Terminals (Wire color) Condition Continuity
    (+) (-)
    B14 49 (B) 52 (B) Ground Ignition switch OFF 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 Ground Circuit (BCM)
      G03107568Courtesy 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.

    CHECK FUSE

    Unit Power source Fuse No.
    Driver seat control unit START power supply 9(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 COMPONENT PARTS AND HARNESS CONNECTOR LOCATION .
  5. CHECK POWER SUPPLY CIRCUIT (DRIVER SEAT CONTROL UNIT) 
    1. Disconnect driver seat control unit connector.
    2. Check voltage between driver seat control unit and ground.
    CHECK POWER SUPPLY CIRCUIT (DRIVER SEAT CONTROL UNIT)

    Connector Terminals (Wire color) Power source condition Voltage (V) (Approx.)
    (+) (-)
    B152 9 (BR) Ground START power supply Ignition switch START Battery voltage
    B153 1A (R), 1A(R), 11A (R/W) Ground Battery power supply Ignition switch OFF Battery voltage

    OK or NG

    1. OK: GO TO 6.
    2. NG: Repair or replace harness between driver seat control unit and fuse block (J/B) or BCM.
      Fig 3: Checking Power Supply Circuit
      G03107569Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK GROUND CIRCUIT (DRIVER SEAT CONTROL UNIT) 
    1. Turn ignition switch OFF.
    2. Check continuity between the driver seat control unit connector B152, B153 terminal16A (B), 61E (B/Y) and ground.

      16A (B) - Ground: Continuity should exist. 

      61E (B/Y) - Ground: Continuity should exist. 

    OK or NG

    1. OK: GO TO 7.
    2. NG: Repair or replace harness between driver seat control unit and ground.
      Fig 4: Checking Ground Circuit
      G03107570Courtesy 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 and ground.
    CHECK POWER SUPPLY CIRCUIT (AUTOMATIC DRIVE POSITIONER CONTROL UNIT)

    Connector Terminals (Wire color) Power source condition Voltage (V) (Approx.)
    (+) (-)
    M49 28 (SB) Ground START power supply Ignition switch START Battery voltage
    M50 39 (W/R) Ground Battery power supply Ignition switch OFF Battery voltage
    Fig 5: Checking Power Supply Circuit (Automatic Drive Positioner Control Unit)
    G03107571Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 8.
    2. NG: Repair or replace harness between driver seat control unit and fuse block (J/B).
  8. CHECK GROUND CIRCUIT (AUTOMATIC DRIVE POSITIONER CONTROL UNIT) 

    Check continuity between the automatic drive positioner control unit connector M50 terminal 40 (B), 48 (B) and ground.

    40 (B) - Ground: Continuity should exist. 

    48 (B) - Ground: Continuity should exist. 

    OK or NG

    1. OK: Driver seat control unit circuit is OK.
    2. NG: Repair or replace harness between automatic drive positioner control unit and ground.
      Fig 6: Checking Ground Circuit (Automatic Drive Positioner Control Unit)
      G03107572Courtesy of NISSAN MOTOR CO., U.S.A.
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