POWER TILT AND POWER TELESCOPIC STEERING COLUMN SYSTEM, Diagnostic DTC:B2621

DTC Code DTC Name
B2621 Communication Interruption

DESCRIPTION

The multiplex tilt and telescopic ECU forms a network with the ECUs of other systems through the communication bus. Each ECU informs the other ECUs that it is connected to the network by outputting a specified signal (periodic signal) onto the communication bus on a regular schedule. The multiplex tilt and telescopic ECU detects the connection of each ECU based on the signal.

DTC No. Detection Item Trouble Area
B2621 Periodic signal from the specified ECU has stopped.

  • Multiplex communication system

  • Main body ECU RH (Cowl side junction block RH)

  • Front power seat switch LH (Position control ECU)*1

  • Front power seat switch RH (Position control ECU)*2

  • Windshield wiper switch assembly (Combination switch ECU)

  • Power source control ECU

  • Multiplex tilt and telescopic ECU

Tech Tips


  • *1: for LHD

  • *2: for RHD

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK OTHER DTC OUTPUT (MULTIPLEX COMMUNICATION SYSTEM)


    1. Check if multiplex communication system DTC B1200, B1210, B1272 or B1278 is output.

      Result
      Result Proceed to
      No output A
      B1200 is output B
      B1210 is output C
      B1272 is output D
      B1278 is output E

      Tech Tips


      • If any other codes besides B2621 are output, perform troubleshooting for those DTCs first.

      • DTC B1200 indicates a main body ECU communication stop malfunction in the multiplex communication system.

      • DTC B1210 indicates a power source control ECU communication stop malfunction in the multiplex communication system.

      • DTC B1272 indicates a power seat ECU communication stop malfunction in the multiplex communication system.

      • DTC B1278 indicates a combination switch ECU communication stop malfunction in the multiplex communication system.


    B

    READ VALUE USING INTELLIGENT TESTER (MAIN BODY ECU RH COMMUNICATION SIGNAL) Click here

    C

    READ VALUE USING INTELLIGENT TESTER (DRIVER SEAT ECU COMMUNICATION SIGNAL) Click here

    D

    READ VALUE USING INTELLIGENT TESTER (COMBINATION SWITCH ECU COMMUNICATION SIGNAL) Click here

    E

    READ VALUE USING INTELLIGENT TESTER (POWER SOURCE CONTROL ECU COMMUNICATION SIGNAL) Click here

    A

    GO TO MULTIPLEX COMMUNICATION SYSTEM Click here

  2. READ VALUE USING INTELLIGENT TESTER (MAIN BODY ECU RH COMMUNICATION SIGNAL)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Check the signal communication state of the main body ECU RH (cowl side junction block RH). Enter the following menus: Chassis / Tilt&Telescopic / Data List.

      Tilt&Telescopic
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Receive from Body

      Communication state of body ECU signal/

      OK or Interpt

      OK: Communication is normal

      Interpt: Communication is interrupted

      		 -
      OK
      "OK" is displayed.

    NG

    REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)

    OK

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

  3. READ VALUE USING INTELLIGENT TESTER (DRIVER SEAT ECU COMMUNICATION SIGNAL)


    1. Check the signal communication state of the front power seat switch LH (position control ECU) on the intelligent tester. Enter the following menus: Chassis / Tilt&Telescopic / Data List.

      Tilt&Telescopic
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Receive from Seat ECU

      Communication state of seat ECU signal/

      OK or Interpt

      OK: Communication is normal

      Interpt: Communication is interrupted

      		 -
      Result
      Result Proceed to
      "OK" is displayed. A
      "Interpt" is displayed (for LHD). B
      "Interpt" is displayed (for RHD). C

    B

    REPLACE FRONT POWER SEAT SWITCH LH (POSITION CONTROL ECU) Click here

    C

    REPLACE FRONT POWER SEAT SWITCH RH (POSITION CONTROL ECU) Click here

    A

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

  4. READ VALUE USING INTELLIGENT TESTER (COMBINATION SWITCH ECU COMMUNICATION SIGNAL)


    1. Check the signal communication state of the combination switch ECU on the intelligent tester. Enter the following menus: Chassis / Tilt&Telescopic / Data List.

      Tilt&Telescopic
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Receive from Combi

      Communication state of combination switch ECU signal/

      OK or Interpt

      OK: Communication is normal

      Interpt: Communication is interrupted

      		 -
      OK
      "OK" is displayed.

    NG

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY (COMBINATION SWITCH ECU) Click here

    OK

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

  5. READ VALUE USING INTELLIGENT TESTER (POWER SOURCE CONTROL ECU COMMUNICATION SIGNAL)


    1. Check the signal communication state of the power source control ECU on the intelligent tester. Enter the following menus: Chassis / Tilt&Telescopic / Data List.

      Tilt&Telescopic
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Power ECU Info

      Communication state of power source control ECU signal/

      OK or Interpt

      OK: Communication is normal

      Interpt: Communication is interrupted

      		 -
      OK
      "OK" is displayed.

    NG

    REPLACE POWER SOURCE CONTROL ECU

    OK

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here