Nissan Maxima Service and Repair Manual: B2128 UART communication line

Nissan Maxima Service and Repair Manual / Body interior / Automatic drive positioner / DTC/circuit diagnosis / B2128 UART communication line

Description

Driver seat control unit performs UART communication with the automatic drive positioner control unit using 1 communication line. Driver seat control unit receives the operation signals of ADP steering switch, door mirror remote control switch and the position signals of tilt sensor, telescopic sensor and door mirror sensors from the automatic drive positioner control unit and transmits the operation request signal.

DTC Logic

DTC DETECTION LOGIC

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
B2128 UART COMM The communication between driver seat control unit and automatic drive positioner control unit is interrupted for a period of time
  • UART communication line (UART communication line is open or shorted)
  • Driver seat control unit
  • Automatic drive positioner control unit

DTC CONFIRMATION PROCEDURE

1. PERFORM DTC CONFIRMATION PROCEDURE

  1. Turn ignition switch ON.
  2. Check "Self diagnostic result" with CONSULT.

Is the DTC is detects?

Diagnosis Procedure

Regarding Wiring Diagram information, refer to ADP-150, "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 ADP-45, "DTC Logic".

Is the DTC displayed again?

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 connect

Nissan Maxima. CHECK UART COMMUNICATION LINE CONTINUITY

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

Nissan Maxima. CHECK UART COMMUNICATION LINE CONTINUITY

Is the inspection result normal?

    B2116 tilt motor
    Description The tilt motor is installed to the steering column assembly. The tilt motor is activated with the automatic drive positioner control unit. The steering column is tilted up/down ...

    Power supply and ground circuit
    BCM BCM : Diagnosis Procedure Regarding Wiring Diagram information, refer to BCS-67, "Wiring Diagram". 1. CHECK FUSE AND FUSIBLE LINK Check if the following BCM fuses or fusible link are blown. ...

    Other materials:

    In-vehicle sensor
    Removal and Installation REMOVAL Remove the instrument lower panel LH. Refer to IP-19, "Removal and Installation". Remove the in-vehicle sensor screw and the in-vehicle sensor. INSTALLATION Installation is in the reverse order of removal. CAUTION: Make sure that the asp ...

    P1212 TCS communication line
    Description This CAN communication line is used to control the smooth engine operation during the TCS operation. Pulse signals are exchanged between ECM and "ABS actuator and electric unit (control unit)". Be sure to erase the malfunction information such as DTC not only for "ABS actuato ...

    STRG branch line circuit
    Diagnosis Procedure 1.CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the steering angle sensor for damage, bend and loose connection (unit side and connector side). 2.CHECK HARNESS FOR OPE ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

    © 2017-2026 Copyright www.nimainfo.com
    0.0457