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 LH*1 or RH*2 and main body ECU (instrument panel junction block assembly) stops for 10 seconds or more.


DTC Code DTC Detection Condition Trouble Area
B2321 No communication between the front door window regulator LH*1 or RH*2 and main body ECU (instrument panel junction block assembly) for 10 seconds or more.

  • Front door window regulator assembly LH*1

  • Front door window regulator assembly RH*2

  • Main body ECU (instrument panel junction block assembly)

  • Harness or connector

WIRING DIAGRAM

A01IP4IE02

INSPECTION PROCEDURE

Note


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

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

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

Tech Tips

When communication between the front door window regulator LH*1 or RH*2 and main body ECU (instrument panel junction block assembly) stops, DTC B2325 is also stored.


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 is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - FRONT DOOR WINDOW REGULATOR)


    1. A01ISZ2E06
      Text in Illustration
      *1 for LHD
      *2 for RHD
      *3

      Front view of wire harness connector

      (to Main Body ECU)
      *4

      Front view of wire harness connector

      (to Front Door Window Regulator LH [for LHD])

      (to Front Door Window Regulator RH [for RHD])

      Disconnect the H79 ECU connector.

    2. Disconnect the K8*1 or J6*2 regulator connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      H79-23 (LIN2) - K8-9 (LIN) Always Below 1 Ω
      H79-23 (LIN2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      H79-23 (LIN2) - J6-9 (LIN) Always Below 1 Ω
      H79-23 (LIN2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (FRONT DOOR WINDOW REGULATOR - BATTERY AND BODY GROUND)


    1. A01ITC9E06
      Text in Illustration
      *1 for LHD
      *2 for RHD
      *3

      Front view of wire harness connector

      (to Front Door Window Regulator LH [for LHD])

      (to Front Door Window Regulator RH [for RHD])

      Disconnect the K8*1 or J6*2 regulator connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      K8-1 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      J6-1 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      K8-2 (B) - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      J6-2 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE FRONT DOOR WINDOW REGULATOR ASSEMBLY


    1. Temporarily replace the front door window regulator LH*1 or RH*2 with a new or normally functioning one Click here.


      • *1: for LHD

      • *2: for RHD

    2. Clear the DTCs Click here.


    NEXT

  6. CHECK FOR DTC


    1. Check for DTCs Click here.

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

    B

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    A

    END (FRONT DOOR WINDOW REGULATOR IS DEFECTIVE)