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 power window regulator motor LH*1 (RH*2) and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

DTC Code DTC Detection Condition Trouble Area
B2321 No communication between the front power window regulator motor LH*1 or RH*2 and main body ECU (multiplex network body ECU) for 10 seconds or more.

  • Front power window regulator motor LH*1

  • Front power window regulator motor RH*2

  • Main body ECU (multiplex network body ECU)

  • Cowl side junction block LH

  • Harness or connector

WIRING DIAGRAM

B001WZ1E01

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the ignition switch off to troubleshoot:

    Connect the GTS to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.

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

Tech Tips

DTC B2325 is stored when the communication between the front power window regulator motor and main body ECU (multiplex network body ECU) stops.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  2. CHECK FOR DTC


    1. Recheck for DTCs Click here.

      Result
      Result Proceed to
      DTC B2321 is output A
      DTC B2321 is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY


    1. Disconnect the A main body ECU connector.

    2. Disconnect the I12*1 or I4*2 motor connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A-16 (LIN2) - I12-9 (LIN) Always Below 1 Ω
      A-16 (LIN2) or I12-9 (LIN) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A-16 (LIN2) - I4-9 (LIN) Always Below 1 Ω
      A-16 (LIN2) or I4-9 (LIN) - Body ground Always 10 kΩ or higher

    NG

    CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY BATTERY AND BODY GROUND)


    1. A01X4M3E01
      Text in Illustration
      *A for LHD
      *B for RHD
      *a

      Front view of wire harness connector

      (to Front Power Window Regulator Motor)

      Disconnect the I12*1 or I4*2 front power window regulator motor connector.


      • *1: for LHD

      • *2: for RHD

    2. Measure the resistance and voltage according to the value(s) in the tables below.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      I12-1 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      I4-1 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      I12-2 (B) - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      I4-2 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY


    1. Temporarily replace the front power window regulator motor LH*1 or RH*2 with a new or normally functioning one Click here.


      • *1: for LHD

      • *2: for RHD

    2. Clear the DTC Click here.


    NEXT

  6. CHECK FOR DTC


    1. Recheck for DTCs Click here.

      Result
      Result Proceed to
      DTC B2321 is not output A
      DTC B2321 is output (for LHD) B
      DTC B2321 is output (for RHD) C

    A

    END (FRONT POWER WINDOW REGULATOR MOTOR IS DEFECTIVE)

    B

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    C

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

  7. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY)


    1. Disconnect the 2J cowl side junction block LH connector.

    2. Disconnect the I12*1 or I4*2 front power window regulator motor connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      2J-13 - I12-9 (LIN) Always Below 1 Ω
      2J-13 or I12-9 (LIN) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      2J-13 - I4-9 (LIN) Always Below 1 Ω
      2J-13 or I4-9 (LIN) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE COWL SIDE JUNCTION BLOCK LH Click here

    B

    REPLACE COWL SIDE JUNCTION BLOCK LH Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR