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:

    The braking distance is long
    Diagnosis Procedure CAUTION: The stopping distance on slippery road surfaces might be longer with the ABS operating than when the ABS is not operating. 1.CHECK FUNCTION Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector to deactivate ABS. In ...

    Excessive ABS function operation frequency
    Diagnosis Procedure 1.CHECK START Check front and rear brake force distribution using a brake tester. 2.CHECK FRONT AND REAR AXLE Make sure that there is no excessive play in the front and rear axles. 3.CHECK WHEEL SENSOR AND SENSOR ROTOR Check the following: Wheel sensor installation for ...

    Yaw rate/side/decel G sensor
    Exploded View Yaw rate/side/decel G sensor Yaw rate/side/decel G sensor harness connector Front Removal and Installation CAUTION:  Do not drop or strike the yaw rate/side/decel G sensor to prevent damage. Do not use power tool to remove the yaw rate/side/decel G s ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

    © 2017-2025 Copyright www.nimainfo.com
    0.0071