LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2321

DTC Code DTC Name
B2321 Driver Side Door ECU Communication Stop

DESCRIPTION

This DTC is stored when LIN communication between the front door window regulator assembly (for driver door) and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2321 Driver Side Door ECU Communication Stop No communication between front door window regulator assembly (for driver door) and main body ECU (multiplex network body ECU) for 10 seconds or more.

  • Front door window regulator assembly (for driver door)

  • Main body ECU (multiplex network body ECU)

  • Power window regulator master switch assembly*1

  • Wire harness or connector

  • DOOR NO. 1*1

  • DOOR NO. 2*2

WIRING DIAGRAM


  1. for Models with Jam Protection Function on 4 Windows


    1. for LHD

      A01LZI5E33

    2. for RHD

      A01LZI5E34

  2. for Models with Jam Protection Function on Driver Door Window Only


    1. for LHD

      A01M0KOE34

    2. for RHD

      A01M0KOE35

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • When a front door window regulator assembly is replaced or removed and reinstalled, it requires initialization.

    for Models with Jam Protection Function on 4 Windows: Click here

    for Models with Jam Protection Function on Driver Door Window Only: Click here

PROCEDURE


  1. SYSTEM CHECK


    1. Check the vehicle specifications.

      Result
      Result Proceed to
      for Models with Jam Protection Function on 4 Windows A
      for Models with Jam Protection Function on Driver Door Window Only B

    B

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - FRONT DOOR WINDOW REGULATOR ASSEMBLY (for Driver Door)) Click here

    A

  2. CHECK DTC OUTPUT


    1. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

    2. Recheck for DTCs.


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      Only DTC B2321 is output. A
      DTC B1206 and B2321 are output simultaneously. B

      Tech Tips

      When DTC B1206 and B2321 are output simultaneously, perform troubleshooting for DTC B1206 first.


    B

    GO TO DTC B1206 Click here

    A

  3. CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY - FRONT DOOR WINDOW REGULATOR ASSEMBLY (for Driver Door))


    1. for LHD


      1. Disconnect the H12 power window regulator master switch assembly connector.

      2. Disconnect the H14 front door window regulator assembly (for driver door) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        H12-16 (LIN2) - H14-9 (LIN) Always Below 1 Ω
        H12-16 (LIN2) - Body ground Always 10 kΩ or higher
        H14-9 (LIN) - Body ground Always 10 kΩ or higher

    2. for RHD


      1. Disconnect the G3 power window regulator master switch assembly connector.

      2. Disconnect the G5 front door window regulator assembly (for driver door) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        G3-16 (LIN2) - G5-9 (LIN) Always Below 1 Ω
        G3-16 (LIN2) - Body ground Always 10 kΩ or higher
        G5-9 (LIN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY


    1. A01LZJTC05
      *a

      Component without harness connected

      (Power Window Regulator Master Switch Assembly)

      Remove the power window regulator master switch assembly.

      Click here

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      16 (LIN2) - 17 (LIN1) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (FRONT DOOR WINDOW REGULATOR ASSEMBLY (for Driver Door) - BATTERY, BODY GROUND)


    1. for LHD


      1. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        H14-2 (B) - H14-1 (GND) Always 11 to 14 V

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        H14-1 (GND) - Body ground Always Below 1 Ω

    2. for RHD


      1. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        G5-2 (B) - G5-1 (GND) Always 11 to 14 V

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        G5-1 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE FRONT DOOR WINDOW REGULATOR ASSEMBLY (for Driver Door)


    1. Replace the front door window regulator assembly (for driver door).

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK DTC OUTPUT


    1. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

    2. Recheck for DTCs.


      Body Electrical > Main Body > Trouble Codes
      OK
      DTC B2321 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT DOOR WINDOW REGULATOR ASSEMBLY (for Driver Door) WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here

  8. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - FRONT DOOR WINDOW REGULATOR ASSEMBLY (for Driver Door))


    1. for LHD


      1. Disconnect the 3C instrument panel junction block assembly connector.

      2. Disconnect the H14 front door window regulator assembly (for driver door) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        3C-23 - H14-9 (LIN) Always Below 1 Ω
        H14-9 (LIN) - Body ground Always 10 kΩ or higher
        3C-23 - Body ground Always 10 kΩ or higher

    2. for RHD


      1. Disconnect the 3C instrument panel junction block assembly connector.

      2. Disconnect the G5 front door window regulator assembly (for driver door) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        3C-23 - G5-9 (LIN) Always Below 1 Ω
        G5-9 (LIN) - Body ground Always 10 kΩ or higher
        3C-23 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      for LHD: Click here

      for RHD: Click here

      A01LV31C03
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

    3. Measure the resistance according to the value(s) in the table below.

      Tech Tips

      This inspection is to check the LIN communication line in the instrument panel junction block assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

      Standard Resistance
      Tester Connection Condition Specified Condition
      3C-23 - MB-16 (LIN2) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for LHD: Click here
    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for RHD: Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (FRONT DOOR WINDOW REGULATOR ASSEMBLY (for Driver Door) - BATTERY, BODY GROUND)


    1. for LHD


      1. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        H14-2 (B) - H14-1 (GND) Always 11 to 14 V

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        H14-1 (GND) - Body ground Always Below 1 Ω

    2. for RHD


      1. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        G5-2 (B) - G5-1 (GND) Always 11 to 14 V

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        G5-1 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. REPLACE FRONT DOOR WINDOW REGULATOR ASSEMBLY (for Driver Door)


    1. Replace the front door window regulator assembly (for driver door).

      for Sedan: Click here

      except Sedan: Click here

      Result
      Proceed to
      NEXT

    NEXT

  12. CHECK DTC OUTPUT


    1. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

    2. Recheck for DTCs.


      Body Electrical > Main Body > Trouble Codes
      OK
      DTC B2321 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT DOOR WINDOW REGULATOR ASSEMBLY (for DRIVER DOOR) WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here