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

  • Power window regulator motor assembly (for driver side)

  • Main body ECU (multiplex network body ECU)

  • Multiplex network master switch assembly

  • Wire harness or connector

  • D FR DOOR fuse

WIRING DIAGRAM

A01JBEQE04

INSPECTION PROCEDURE

Note


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

  • When a power window regulator motor 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. CHECK DTC OUTPUT


    1. Clear the DTC Click here.

    2. Recheck for DTCs.

      Result
      Result Proceed to
      Only DTC B2321 is output. A
      DTC B1206 and B2321 are output simultaneously. B

      Tech Tips

      When DTC B1206 and B2321 are output simultaneously, perform troubleshooting for DTC B1206 first.


    B

    GO TO DTC B1206 Click here

    A

  2. CHECK HARNESS AND CONNECTOR (MASTER SWITCH - DRIVER SIDE POWER WINDOW REGULATOR MOTOR)


    1. A01JAO5E19
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Multiplex Network Master Switch Assembly)
      *2

      Front view of wire harness connector

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

      Disconnect the O6*1 or N6*2 multiplex network master switch connector.

    2. Disconnect the O2*1 or N2*2 power window regulator motor (for driver side) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      O6-16 (LIN2) - O2-9 (LIN)*1

      N6-16 (LIN2) - N2-9 (LIN)*2

      		 Always Below 1 Ω

      O6-16 (LIN2) - Body ground*1

      N6-16 (LIN2) - Body ground*2

      		 Always 10 kΩ or higher

      • *1: for LHD

      • *2: for RHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY


    1. A01J95PE04
      Text in Illustration
      *1

      Component without harness connected

      (Multiplex Network Master Switch Assembly)

      Remove the multiplex network master switch assembly Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      16 (LIN2) - 17 (LIN1) Always Below 1 Ω
      16 (LIN2) - Body ground Always 10 kΩ or higher

    NG

    REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY Click here

    OK

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


    1. A01J99EE27
      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

      O2-2 (B) - Body ground*1

      N2-2 (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

      O2-1 (GND) - Body ground*1

      N2-1 (GND) - Body ground*2

      		 Always Below 1 Ω

      • *1: for LHD

      • *2: for RHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for DRIVER SIDE)


    1. Replace the power window regulator motor assembly (for driver side) Click here.


    NEXT

  6. 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 (POWER WINDOW REGULATOR MOTOR ASSEMBLY WAS DEFECTIVE)