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 power window regulator motor assembly LH and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

DTC No. DTC Detection Condition Trouble Area
B2321 No communication between front power window regulator motor assembly LH and main body ECU (multiplex network body ECU) for more than 10 seconds.

  • Front power window regulator motor assembly LH

  • Main body ECU (multiplex network body ECU)

  • Instrument panel junction block assembly

  • Multiplex network master switch assembly

  • Wire harness or connector

  • FL DOOR fuse*1

  • FR DOOR fuse*2

WIRING DIAGRAM

A01NHTBE21

INSPECTION PROCEDURE

Note


  • When the front power window regulator motor assembly LH or RH 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 Click here.

      A01NGJME02

    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
      2D-27 (LIN2) - MB-16 (LIN2) Always Below 1 Ω
      2D-27 (LIN2) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 *2

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR


    1. A01NFS8E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)
      *2

      Front view of wire harness connector

      (to Front Power Window Regulator Motor Assembly)
      *3 for LHD
      *4 for RHD

      Disconnect the J1 front power window regulator motor assembly LH connector*1.

    2. Disconnect the I2 front power window regulator motor assembly RH connector*2.

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      2D-27 (LIN2) - J1-9 (LIN)*1

      2D-27 (LIN2) - I2-9 (LIN)*2

      		 Always Below 1 Ω
      2D-27 (LIN2) - Body ground Always 10 kΩ or higher

      • *1: for LHD

      • *2: for RHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR


    1. A01NDL5E21
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Front Power Window Regulator Motor Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition

      J1-2 (B) - Body ground*1

      I2-2 (B) - Body ground*2

      		 Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      J1-1 (E) - Body ground*1

      I2-1 (E) - Body ground*2

      		 Always Below 1 Ω

      • *1: for LHD

      • *2: for RHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY (Driver Side)


    1. Replace the front power window regulator motor assembly LH 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) Click here

    OK

    END (FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH WAS DEFECTIVE)