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 assembly 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 assembly LH*1 (RH*2) and main body ECU for 10 seconds or more

  • Front power window regulator motor assembly LH*1

  • Front power window regulator motor assembly RH*2

  • Main body ECU

  • Wire harness

WIRING DIAGRAM

A01GN78E38

INSPECTION PROCEDURE

Note


  • When using the intelligent tester with the engine 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. Delete 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 - FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY)

    Tech Tips

    *1: for LHD

    *2: for RHD

    A01GKI6E08

    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
      Tester Connection Condition Specified Condition
      L11-10 (LIN2) - N11-9 (LIN)*1 or N3-9 (LIN)*2 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH*1, RH*2 (BATTERY VOLTAGE AND GROUND)

    Tech Tips

    *1: for LHD

    *2: for RHD


    1. A01GLO1E25

      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
      Tester Connection Condition Specified Condition
      N11-2 (B)*1 or N3-2 (B)*2 - Body ground Always Below 1 Ω
      Standard voltage
      Tester Connection Switch Condition Specified Condition
      N11-1 (E)*1 or N3-1 (E)*2 - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH*1, RH*2

    Tech Tips

    *1: for LHD

    *2: for RHD


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


    NEXT

  6. CHECK FOR DTC


    1. Delete the DTC Click here.

    2. 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 ASSEMBLY IS DEFECTIVE)