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Home >> Infiniti >> 2018 >> Q70 5.6 Luxe, RWD >> Repair and Diagnosis >> Accessories & Equipment >> Seats >> Automatic Drive Positioner (DTC/Circuit Diagnosis) (Except Hybrid) >> DTC/Circuit Diagnosis >> DTC B2128: UART Communication Line >> Diagnosis Procedure

Diagnosis Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE 
    1. Turn Ignition Switch ON.
    2. Check "Self diagnostic result" with CONSULT.
    3. Erase the DTC.
    4. Perform DTC confirmation procedure. Refer to DTC Logic .

    Is the DTC displayed again?

    YES

    GO TO 2.

    NO

    Check intermittent incident. Refer to Intermittent Incident .

  2. CHECK UART COMMUNICATION LINE CONTINUITY 
    1. Turn Ignition Switch OFF.
    2. Disconnect Driver Seat Control Unit and Automatic Drive Positioner Control Unit connector.
    3. Check continuity between Driver Seat Control Unit harness connector and Automatic Drive Positioner Control Unit harness connector.

      Driver Seat Control Unit

      Automatic Drive Positioner Control Unit

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B514

      32

      M51

      8

      Existed

    4. Check continuity between Driver Seat Control Unit harness connector and ground.

      Driver Seat Control Unit

      Ground

      Continuity

      Connector

      Terminal

      B514

      32

      Not existed

    Is the inspection result normal?

    YES

    Check intermittent incident. Refer to Intermittent Incident .

    NO

    Repair or replace harness or connector.