LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2321

DTC Code DTC Name
B2321 Driver Side Door ECU Communication Stop

DESCRIPTION

This DTC is output when LIN communication between the front power window regulator motor LH*1 (RH*2) and main body ECU stops for 10 seconds or more.

Tech Tips

*1: for LHD

*2: for RHD

DTC Code DTC Detection Condition Trouble Area
B2321 No communication between front power window regulator motor LH*1 (RH*2) and main body ECU for 10 seconds or more

  • Front power window regulator motor LH*1

  • Front power window regulator motor RH*2

  • Main body ECU

  • Harness or connector

WIRING DIAGRAM

A01H26NE75

INSPECTION PROCEDURE

Note


  • When using the intelligent tester with the power 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 tester and vehicle begins.

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

Tech Tips

DTC B2325 is output when the communication between all of the following components and main body ECU stops.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  2. CHECK FOR DTC


    1. Recheck for DTC Click here.

      Result:
      Result Proceed to
      DTC B2321 output reoccurs A
      DTC B2321 output does not reoccur B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - POWER WINDOW REGULATOR MOTOR)

    A01H127E04

    Tech Tips

    *1: for LHD

    *2: for RHD


    1. Disconnect the L11 ECU connector.

    2. Disconnect the N11*1 or N3*2 motor connector.

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

      Standard resistance
      for LHD:
      Tester Connection Condition Specified Condition
      L11-10 (LIN2) - N11-9 (LIN) Always Below 1 Ω
      for RHD:
      Tester Connection Condition Specified Condition
      L11-10 (LIN2) - N3-9 (LIN) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR - BATTERY AND BODY GROUND)

    Tech Tips

    *1: for LHD

    *2: for RHD


    1. A01GXJBE08

      Disconnect the N11*1 or N3*2 motor connector.

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

      Standard resistance
      for LHD:
      Tester Connection Condition Specified Condition
      N11-1 (E) - Body ground Always Below 1 Ω
      for RHD:
      Tester Connection Condition Specified Condition
      N3-1 (E) - Body ground Always Below 1 Ω
      Standard voltage
      for LHD:
      Tester Connection Switch Condition Specified Condition
      N11-2 (B) - Body ground Power switch on (IG) 11 to 14 V
      for RHD:
      Tester Connection Switch Condition Specified Condition
      N3-2 (B) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK FRONT POWER WINDOW REGULATOR MOTOR LH*1, RH*2 (OPERATION)

    Tech Tips

    *1: for LHD

    *2: for RHD


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

    2. Clear the DTC Click here.


    NEXT

  6. CHECK FOR DTC


    1. Recheck for DTC Click here.

      Result:
      Result Proceed to
      DTC B2321 output does not reoccur A
      DTC B2321 output reoccurs B

    B

    REPLACE MAIN BODY ECU

    A

    END (FRONT POWER WINDOW REGULATOR MOTOR IS DEFECTIVE)