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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 92 (Automatic Drive Positioner (DTC/Circuit Diagnosis) (Except Hybrid)) >> DTC/Circuit Diagnosis >> DTC B2128: UART Communication Line >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to WIRING DIAGRAM .

  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 STEP 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 connector Automatic drive positioner control unit connector Continuity
      Connector Terminal Connector Terminal
      B0029 15 M33 8 Yes
    4. Check continuity between driver seat control unit harness connector and ground.
      Driver seat control unit Ground Continuity
      Connector Terminal
      B0029 15 No

    Is the inspection result normal?

    YES 

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    NO 

    Repair or replace harness.

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