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

DTC No. DTC Detection Condition Trouble Area
B2321 No communication between power window regulator motor assembly (for driver door) and main body ECU (multiplex network body ECU) for 10 seconds or more.

  • Power window regulator motor assembly (for driver door)

  • Main body ECU (multiplex network body ECU)

  • Multiplex network master switch assembly

  • Wire harness or connector

  • DOOR F/L fuse*1

  • DOOR F/R fuse*2

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

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

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

  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

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PROCEDURE


  1. Click here

    CHECK DTC OUTPUT


    1. Clear the DTCs (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 (MASTER SWITCH - DRIVER DOOR POWER WINDOW REGULATOR MOTOR)


    1. Disconnect the M4*1 or L13*2 multiplex network master switch connector.


      • *1: for LHD

      • *2: for RHD

    2. Disconnect the M8*1 or L9*2 power window regulator motor (for driver door) connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      Table 1. for LHD
      Tester Connection Condition Specified Condition
      M4-16 (LIN2) - M8-9 (LIN) Always Below 1 Ω
      M4-16 (LIN2) - Body ground Always 10 kΩ or higher
      Table 2. for RHD
      Tester Connection Condition Specified Condition
      L13-16 (LIN2) - L9-9 (LIN) Always Below 1 Ω
      L13-16 (LIN2) - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

    INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY


    1. A0008QWE03

      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
      Table 3. Text in Illustration
      *a

      Component without harness connected

      (Multiplex Network Master Switch Assembly)

  4. Click here

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


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

      Standard Voltage
      Table 4. for LHD
      Tester Connection Condition Specified Condition
      M8-2 (B) - Body ground Power switch off 11 to 14 V
      Table 5. for RHD
      Tester Connection Condition Specified Condition
      L9-2 (B) - Body ground Power switch off 11 to 14 V

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

      Standard Resistance
      Table 6. for LHD
      Tester Connection Condition Specified Condition
      M8-1 (GND) - Body ground Always Below 1 Ω
      Table 7. for RHD
      Tester Connection Condition Specified Condition
      L9-1 (GND) - Body ground Always Below 1 Ω

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. Click here

    REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (FOR DRIVER DOOR)


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


  6. Click here

    CHECK DTC OUTPUT


    1. Clear the DTCs (Click here).

    2. Check for DTCs.

      OK
      DTC B2321 is not output.

    • OK

      END (POWER WINDOW REGULATOR MOTOR ASSEMBLY (FOR DRIVER DOOR) WAS DEFECTIVE)

    • NG

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