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 (for Driver Side) 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 (for Driver Side) and main body ECU (instrument panel junction block assembly) for 10 seconds or more.

  • Front door window regulator (for Driver Side)

  • Main body ECU (instrument panel junction block assembly)

  • Harness or connector

WIRING DIAGRAM

A0052B4E04

CAUTION / NOTICE / HINT

Note


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

    Connect the intelligent tester to the vehicle, and turn a courtesy 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 the communication between the front door window regulator (for Driver Side) 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. Recheck 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)

    A0053GZE02
    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 [for Driver Side])

    1. Disconnect the D79 ECU connector.

    2. Disconnect the E15*1 or E6*2 regulator connector.

      *1: for LHD

      *2: for RHD

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D79-23 (LIN2) - E15-9 (LIN)*1 or E6-9 (LIN)*2 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A0053UCE02
      Text in Illustration
      *1 for LHD
      *2 for RHD
      *3

      Front view of wire harness connector

      (to Front Door Window Regulator [for Driver Side])

      Disconnect the E15*1 or E6*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
      Tester Connection Condition Specified Condition
      E15-1 (GND)*1 or E6-1 (GND)*2 - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      E15-2 (B)*1 or E6-2 (B)*2 - 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 (for Driver Side) with a new or normally functioning one Click here.

    2. Clear the DTCs Click here.


    NEXT

  6. CHECK FOR DTC


    1. Recheck 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 IS DEFECTIVE)

    B

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)