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 RH (power window regulator motor assembly RH) (driver side)*1 or front door window regulator assembly LH (power window regulator motor assembly LH) (driver side)*2 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 the front door window regulator assembly RH (power window regulator motor assembly RH) (driver side)*1 or front door window regulator assembly LH (power window regulator motor assembly LH) (driver side)*2 and main body ECU (multiplex network Body ECU) for 10 seconds or more.

  • Front door window regulator assembly RH (power window regulator motor assembly RH) (driver side)*1

  • Front door window regulator assembly LH (Power window regulator motor assembly LH) (driver side)*2

  • Main body ECU (multiplex network Body ECU)

  • Instrument panel junction block assembly

  • Harness or connector

*1 : for RHD

*2 : for LHD

WIRING DIAGRAM

A004FWDE02

CAUTION / NOTICE / HINT

Note


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

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

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

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

Tech Tips


  • When communication between the front door window regulator assembly RH (power window regulator motor assembly RH) (driver side)*1 or front door window regulator assembly LH (power window regulator motor assembly LH) (driver side)*2 and main body ECU (multiplex network Body ECU) stops, DTC B2325 is also stored.

*1 : for RHD

*2 : for LHD

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B2321 is output A
      DTC B2321 and B2325 is output B

      Tech Tips

      When both B2321 and B2325 are output at the same time, troubleshoot B2325 first.


    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  3. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    A004EEHE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Instrument Panel Junction Block Assembly)

    1. Remove the main body ECU (multiplex network Body ECU) from the instrument panel junction block assembly Click here.

    2. Disconnect the 3B instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      MB-16 (LIN2) - 3B-12 Always Below 1 Ω
      MB-16 (LIN2) or 3B-12 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - POWER WINDOW REGULATOR MOTOR ASSEMBLY)


    1. Disconnect the G3 front door window regulator assembly RH (power window regulator motor assembly RH) (driver side)*1 or H3 front door window regulator assembly LH (power window regulator motor assembly LH) (driver side)*2 connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      3B-12 - G3-9 (LIN)*1

      3B-12 - H3-9 (LIN)*2

      		 Always Below 1 Ω

      3B-12 or G3-9 (LIN) - Body ground*1

      3B-12 or H3-9 (LIN) - Body ground*2

      		 Always 10 kΩ or higher

      *1 : for RHD

      *2 : for LHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    A004FB6E01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to front door window regulator assembly RH (Power Window Regulator Motor Assembly RH) (Driver Side))*1
    *b

    Front view of wire harness connector

    (to front door window regulator assembly LH (Power Window Regulator Motor Assembly LH) (Driver Side))*2

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      G3-1 (GND) - Body ground*1

      H3-1 (GND) - Body ground*2

      		 Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition

      G3-2 (B) - Body ground*1

      H3-2 (B) - Body ground*2

      		 Ignition switch off 11 to 14 V

      *1 : for RHD

      *2 : for LHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  6. REPLACE FRONT DOOR WINDOW REGULATOR ASSEMBLY (FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY)


    1. Replace the front door window regulator assembly RH (power window regulator motor assembly RH) (driver side)*1 or front door window regulator assembly LH (power window regulator motor assembly LH) (driver side)*2 Click here.

      *1 : for RHD

      *2 : for LHD


    NEXT

  7. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  8. CHECK FOR DTC


    1. Check for DTCs Click here.

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

    A

    END (FRONT DOOR WINDOW REGULATOR ASSEMBLY (POWER WINDOW REGULATOR MOTOR ASSEMBLY) WAS DEFECTIVE

    B

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