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 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 NO. 2

WIRING DIAGRAM

A01I2U8E37

INSPECTION PROCEDURE

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.

  • When using the Techstream to troubleshoot with the power switch off:

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

PROCEDURE


  1. 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

      Tech Tips

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


    B

    GO TO DTC B1206 Click here

    A

  2. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH - POWER WINDOW REGULATOR MOTOR ASSEMBLY (FOR DRIVER DOOR))


    1. Disconnect the K11 multiplex network master switch assembly connector.

    2. Disconnect the K9 power window regulator motor (for driver door) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K11-7 (LIN2) - K9-9 (LIN) Always Below 1 Ω
      K11-7 (LIN2) or K9-9 (LIN) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY


    1. A01I50EE39
      Text in Illustration
      *a

      Component without harness connected

      (Multiplex Network Master Switch Assembly)

      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
      7 (LIN2) - 6 (LIN1) Always Below 1 Ω
      7 (LIN2) or 6 (LIN1) - Body ground Always 10 kΩ or higher

    NG

    REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR ASSEMBLY (FOR DRIVER DOOR) - AUXILIARY BATTERY, BODY GROUND))


    1. Disconnect the K9 power window regulator motor (for driver door) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K9-2 (B) - Body ground Power switch off 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K9-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (FOR DRIVER DOOR)


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


    NEXT

  6. CHECK DTC OUTPUT


    1. Clear the DTC Click here.

    2. Check for DTCs.

      OK
      DTC B2321 is not output.

    NG

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

    OK

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