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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Automatic Drive Positioner System (DTC/Circuit Diagnosis)) >> DTC / Circuit Diagnosis >> DTC B2128: UART Communication Line >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. PERFORM DTC CONFIRMATION PROCEDURE 

    SYMBOL CONSULT

    1. Turn ignition switch ON.
    2. Check "Self Diagnostic Result" mode of "AUTO DRIVE POS".
    3. Erase the DTC.
    4. Perform DTC confirmation procedure. Refer to DTC Confirmation Procedure .

    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.
    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

      B222

      15

      M63

      8

      Yes

    4. Check continuity between driver seat control unit harness connector and ground.

      Driver seat control unit

      Ground

      Continuity

      Connector

      Terminal

      B222

      15

      No

    Is the inspection result normal?

    YES

    Check intermittent incident. Refer to Intermittent Incident .

    NO

    Repair or replace harness.