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Check UART Communication Line Circuit

WARNING: This page is about a different car, the 2006 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK UART LINE HARNESS 
    1. Turn ignition switch OFF.
    2. Disconnect driver seat control unit connector and automatic drive positioner control unit connector.
    3. Check continuity between driver seat control unit connector B324 terminal 1, 17 and automatic drive positioner connector M96 terminal 10, 26.

      17 (P) - 26 (R/G) : Continuity should exist. 

      1 (GY) - 10 (R/L) : Continuity should exist. 

    4. Check continuity between driver seat control unit connector B324 terminal 1, 17 and ground.

      17 (P) - Ground : Continuity should not exist. 

      1 (GY) - Ground : Continuity should not exist. 

    Fig 1: Identifying Continuity Between Driver Seat Control Unit Connector B324 Terminal 1, 17 And Ground
    G04123149Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK : GO TO 2.
    • NG : Repair or replace harness between driver seat control unit and automatic drive positioner.
  2. CHECK UART LINE SIGNAL 1 
    1. Turn ignition switch ON.
    2. Check signal between driver seat control unit connector ground, with oscilloscope.
      SIGNAL REFERENCE VALUE

      Connector Terminals (Wire color) Condition Signal(Reference value)
      (+) (-)
      B324 17 (P) Ground Seat memory switch 1 or 2 operation
      G04077618Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 2: Identifying Signal Between Driver Seat Control Unit Connector Ground
      G04123151Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG

      • OK : GO TO 3.
      • NG : Check the flowing.
    • When voltage signal dose not appear with a constant voltage (approx. 5V), replace driver seat control unit.
    • When voltage signal dose not appear with a constant voltage (approx. 0V), replace automatic drive positioner control unit.
  3. CHECK UART LINE SIGNAL 2 

    Check signal between automatic driver positioner control unit connector ground, with oscilloscope.

    SIGNAL REFERENCE VALUE

    Connector Terminals (Wire color) Condition Signal (Reference value)
    (+) (-)
    M96 10 (R/L) Ground Seat memory switch 1 or 2 operation
    G04077620Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 3: Identifying Signal Between Automatic Driver Positioner Control Unit Connector Ground
    G04123153Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK : GO TO 4.
    • NG : Check the flowing.
    • When voltage signal dose not appear with a constant voltage (approx. 5V), replace automatic driver seat control unit.
    • When voltage signal dose not appear with a constant voltage (approx. 0V), replace driver seat control unit.
  4. CHECK DRIVER SEAT CONTROL UNIT 

    Dose the automatic drive positioner operate, when the driver control unit exchanged?

    Does seat memory function operate?

    • YES : Replace automatic drive positioner control unit.
    • NG : Replace driver seat control unit.
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