LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2321

DTC Code DTC Name
B2321 Driver Side Door ECU Communication Stop

DESCRIPTION

The main body ECU stores a DTC when communication with the front door window regulator sub-assembly RH*1 or the front door window regulator sub-assembly LH*2 is interrupted for 10 seconds or more.

DTC No. DTC Detection Condition Trouble Area
B2321 Communication between front door window regulator sub-assembly RH*1 or the front door window regulator sub-assembly LH*2 and main body ECU interrupted for 10 seconds or more, or communication wire malfunction.

  • Harness or connector

  • Front door window regulator sub-assembly RH*1

  • Front door window regulator sub-assembly LH*2

  • Main body ECU

*1: for RHD

*2: for LHD

WIRING DIAGRAM

A0119VYE01
A0119VYE02

INSPECTION PROCEDURE

Tech Tips


  • When using the intelligent tester, repeatedly turn either front door courtesy light switch off-and-on at intervals of 1.5 seconds or less until communication between the intelligent tester and vehicle begins.

  • When the main body ECU has been replaced with a new part, or when the battery negative terminal is reconnected, the ignition switch condition will be ON. Also, after the battery is disconnected and reconnected, the LIN communication system condition is the same as it was before the battery was disconnected.

Note

Inspect the fuses for this circuit before starting this inspection procedure.

PROCEDURE


  1. CLEAR DTC


    1. Clear 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 B1206 are output B
      DTC B2321, B1206 and/or B2325 are output

      Tech Tips


      • When both B1206 and B2321 are output at the same time, troubleshoot B1206 first.

      • When both B1206 and B2325 are output at the same time, troubleshoot B2325 first.


    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  3. SYSTEM CHECK


    1. Check the vehicle specifications.

      Result
      Result Proceed to
      for RHD A
      for LHD B

    B

    CHECK HARNESS AND CONNECTOR (MASTER SWITCH - REGULATOR LH) Click here

    A

  4. CHECK HARNESS AND CONNECTOR (MASTER SWITCH - REGULATOR RH)


    1. A01198OE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Window Regulator Master Switch Assembly)
      *2

      Front view of wire harness connector

      (to Front Door Window Regulator Sub-Assembly RH)

      Disconnect the E1 power window regulator master switch assembly connector.

    2. Disconnect the E4 front door window regulator sub-assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E1-16 (LIN2) - E4-9 (LIN) Always Below 1 Ω
      E4-9 (LIN) - Body ground Always 10 KΩ or higher

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E4-9 (LIN) - Body ground Always Below 0.5 V

    5. Reconnect the power window regulator master switch assembly connector.

    6. Reconnect the front door window regulator sub-assembly RH connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (REGULATOR RH - BATTERY AND BODY GROUND)


    1. A01199QE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Front Door Window Regulator Sub-Assembly RH)

      Disconnect the E4 front door window regulator sub-assembly RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E4-2 (B) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E4-1 (GND) - Body ground Always Below 1 Ω

    4. Reconnect the front door window regulator sub-assembly RH connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE FRONT DOOR WINDOW REGULATOR SUB-ASSEMBLY RH NORMAL ONE


    1. Replace the front door window regulator sub-assembly RH with a normally functioning part Click here.

    2. Clear DTCs Click here.


    NEXT

  7. RECONFIRM DTC OUTPUT


    1. Recheck for DTCs Click here.

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

    B

    REPLACE MAIN BODY ECU Click here

    A

    END (FRONT DOOR WINDOW REGULATOR SUB-ASSEMBLY RH MALFUNCTION)

  8. CHECK HARNESS AND CONNECTOR (MASTER SWITCH - REGULATOR LH)


    1. A01198OE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Window Regulator Master Switch Assembly)
      *2

      Front view of wire harness connector

      (to Front Door Window Regulator Sub-Assembly LH)

      Disconnect the F1 power window regulator master switch assembly connector.

    2. Disconnect the F4 front door window regulator sub-assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F1-16 (LIN2) - F4-9 (LIN) Always Below 1 Ω
      F4-9 (LIN) - Body ground Always 10 KΩ or higher

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F4-9 (LIN) - Body ground Always Below 0.5 V

    5. Reconnect the power window regulator master switch assembly connector.

    6. Reconnect the front door window regulator sub-assembly LH connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (REGULATOR LH - BATTERY AND BODY GROUND)


    1. A01199QE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Front Door Window Regulator Sub-Assembly LH)

      Disconnect the F4 front door window regulator sub-assembly LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F4-2 (B) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F4-1 (GND) - Body ground Always Below 1 Ω

    4. Reconnect the front door window regulator sub-assembly LH connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. REPLACE FRONT DOOR WINDOW REGULATOR SUB-ASSEMBLY LH NORMAL ONE


    1. Replace the front door window regulator sub-assembly LH with a normally functioning part Click here.

    2. Clear DTCs Click here.


    NEXT

  11. RECONFIRM DTC OUTPUT


    1. Recheck for DTCs Click here.

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

    B

    REPLACE MAIN BODY ECU Click here

    A

    END (FRONT DOOR WINDOW REGULATOR SUB-ASSEMBLY LH MALFUNCTION)