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 power window regulator motor assembly (for driver side) and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

DTC No. DTC Detection Condition Trouble Area
B2321 No communication between front door window regulator assembly (for driver side) and main body ECU (multiplex network body ECU) for 10 seconds or more.

  • Front door window regulator assembly (for driver side)

  • Main body ECU (multiplex network body ECU)

  • Wire harness or connector

  • D FR DOOR fuse

WIRING DIAGRAM

A003UUIE49

INSPECTION PROCEDURE

Tech Tips

When the main body ECU (multiplex network body ECU) has been replaced with a new part, and the cable from the negative (-) battery terminal is reconnected, the power switch will be on (IG). Also, when the battery has been removed and installed, the condition will be the same as it was before the battery was disconnected.

Note


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

  • When a front door window regulator assembly is replaced or removed and reinstalled, it requires initialization Click here.

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

    Connect the intelligent tester to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the intelligent tester and vehicle begins.

PROCEDURE


  1. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

      Tech Tips

      This inspection is to check the LIN line in the instrument panel junction block assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-27 (LIN2)- MB-16 (LIN2) Always Below 1 Ω
      2A-27 (LIN2) - Body ground Always 10 kΩ or higher

    B

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    A

  2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - DRIVER SIDE POWER WINDOW REGULATOR MOTOR)


    1. Disconnect the I6*1 or H5*2 power window regulator motor (for driver side) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      2A-27 (LIN2) - I6-9 (LIN)*1

      2A-27 (LIN2) - H5-9 (LIN)*2

      		 Always Below 1 Ω

      2A-27 (LIN2) - Body ground*1

      2A-27 (LIN2) - Body ground*2

      		 Always 10 kΩ or higher

      • *1: for LHD

      • *2: for RHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A003TJ5E39
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Window Regulator Motor Assembly (for Driver Side))
      *2 for LHD
      *3 for RHD

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

      Standard Voltage
      Tester Connection Condition Specified Condition

      I6-2 (B) - Body ground*1

      H5-2 (B) - Body ground*2

      		 Power switch off 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      I6-1 (GND) - Body ground*1

      H5-1 (GND) - Body ground*2

      		 Always Below 1 Ω

      • *1: for LHD

      • *2: for RHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE FRONT DOOR WINDOW REGULATOR ASSEMBLY (for Driver Side)


    1. Replace the front door window regulator assembly (for driver side) Click here.


    NEXT

  5. CHECK DTC OUTPUT


    1. Clear the DTC Click here.

    2. Check for DTCs.

      OK
      DTC B2321 is not output.

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    OK

    END (FRONT DOOR WINDOW REGULATOR ASSEMBLY WAS DEFECTIVE)