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Check Communication Signal Circuit

  1. CHECK COMMUNICATION CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect driver door control unit (LCU01) and malfunctioning door control unit connector.
    3. Check continuity between driver door control unit (LCU01) connector terminal 5 and malfunctioning door control unit connector terminal 11.

      Passenger door control unit

      PASSENGER DOOR CONTROL UNIT

      Terminals Continuity
      Driver door control unit Passenger door control unit
      Connector Terminal (Wire color) Connector Terminal (Wire color)
      D8 5 (G/OR) D38 11 (G/OR) Yes

      Rear door control unit LH or RH

      REAR DOOR CONTROL UNIT LH OR RH

      Terminals Continuity
      Driver door control unit Rear LH or RH door control unit
      Connector Terminal (Wire color) Connector Terminal (Wire color)
      D8 5 (G/OR) D58 (LH)
      D78 (RH)      		 11 (G/OR) Yes
      Fig 1: Checking Continuity Between Driver Door Control Unit (LCU01) Connector Terminal 5 And Malfunctioning Door Control Unit Connector Terminal 11
      G04129762Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between driver door control unit (LCU01) connector terminal 5 and ground.

      5 (G/OR) - Ground: Continuity should not exist. 

    OK or NG 

    • OK: GO TO 2.
    • NG: Repair or replace harness
  2. CHECK COMMUNICATION SIGNAL 
    1. Connect driver door control unit (LCU01) and malfunctioning door control unit connector.
    2. Turn ignition switch ON.
    3. Check the signal between malfunctioning door control unit connector terminal 11 and ground with oscilloscope.
      PASSENGER DOOR CONTROL UNIT REFERENCE TABLE

      Passenger door control unit Signal (Reference value)
      Terminals
      (+) (-)
      G04129763Courtesy of NISSAN MOTOR CO., U.S.A.
      Connector Terminal (Wire color) Ground
      D38 11 (G/OR)
      Rear LH, RH door control unit
      Terminals
      (+) (-)
      Connector Terminal (Wire color) Ground
      D58 (LH)
      D78 (RH)      		 11 (G/OR)
      Fig 2: Checking Signal Between Malfunctioning Door Control Unit Connector Terminal 11 And Ground
      G04129764Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: Communication signal is OK.
    • NG:
      • If all door control unit (passenger, rear LH or RH) connected are NG, replace driver door control unit (LCU01).
      • If any of door control unit (passenger, rear LH or RH) connected are NG, replace malfunctioning door control unit.
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