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LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2321

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DTC Code DTC Name
B2321 Driver Side Door ECU Communication Stop
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DESCRIPTION

This DTC is output when LIN communication between the power window regulator motor assembly (for driver side) and main body ECU stops for more than 10 seconds.

DTC Code DTC Detection Condition Trouble Area
B2321 No communication between front power window regulator motor assembly (for driver side) and main body ECU for more than 10 seconds.

  • Power window regulator motor assembly (for Driver side)

  • Main body ECU

  • Multiplex network master switch assembly

  • Wire harness or connector

  • P/W FL fuse*1

  • P/W FR fuse*2

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

  • When the power window regulator motor assembly (for driver side) is replaced or removed and reinstalled, it requires initialization (Click here).

  • When using the intelligent tester to troubleshoot with the engine switch off:

    Connect the intelligent tester to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the tester and vehicle begins.

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PROCEDURE


  1. Click here

    CHECK DTC OUTPUT


    1. Clear the DTC (Click here).

    2. Recheck for DTCs.

      Result
      Result Proceed to
      Only DTC B2321 is output. A
      DTC B1206 and B2321 are output simultaneously. B
      Tip:

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


  2. Click here

    CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR - BATTERY AND BODY GROUND)


    1. Disconnect the J4*1 or I4*2 motor connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      Table 1. for LHD
      Tester Connection Condition Specified Condition
      J4-1 (GND) - Body ground Always Below 1 Ω
      Table 2. for RHD
      Tester Connection Condition Specified Condition
      I4-1 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      Table 3. for LHD
      Tester Connection Condition Specified Condition
      J4-2 (B) - Body ground Always 11 to 14 V
      Table 4. for RHD
      Tester Connection Condition Specified Condition
      I4-2 (B) - Body ground Always 11 to 14 V

  3. Click here

    CHECK HARNESS AND CONNECTOR (MASTER SWITCH - POWER WINDOW REGULATOR MOTOR ASSEMBLY)


    1. Disconnect the J10*1 or I3*2 switch connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      Table 5. for LHD
      Tester Connection Condition Specified Condition
      J10-16 (LIN2) - J4-9 (LIN) Always Below 1 Ω
      J10-16 (LIN2) - Body ground Always 10 kΩ or higher
      Table 6. for RHD
      Tester Connection Condition Specified Condition
      I3-16 (LIN2) - I4-9 (LIN) Always Below 1 Ω
      I3-16 (LIN2) - Body ground Always 10 kΩ or higher

  4. Click here

    INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY


    1. A01CAP4E02

      Remove the multiplex network 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

  5. Click here

    REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for DRIVER SIDE)


    1. Replace the power window regulator motor assembly (for driver side) (Click here).


  6. Click here

    CHECK DTC OUTPUT


    1. Clear the DTC (Click here).

    2. Recheck for DTCs.

      OK
      DTC B2321 is not output.

  7. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE FUSE

  9. Click here

    REPLACE MAIN BODY ECUClick here

  10. Click here

    END (POWER WINDOW REGULATOR MOTOR ASSEMBLY IS DEFECTIVE)

  11. Click here

    REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLYClick here

  12. Click here

    GO TO DTC B1206Click here