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 door) and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2321 Driver Side Door ECU Communication Stop No communication between power window regulator motor assembly (for driver door) and main body ECU (multiplex network body ECU) for 10 seconds or more.

  • Power window regulator motor assembly (for driver door)

  • Main body ECU (multiplex network body ECU)

  • Wire harness or connector

  • DOOR F/L fuse*1

  • DOOR F/R fuse*2

WIRING DIAGRAM

A01MRK9E35

CAUTION / NOTICE / HINT

Note


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

  • When a power window regulator motor assembly is replaced or removed and reinstalled, it requires initialization.

    Click here

  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

PROCEDURE


  1. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      Click here

      A01MS2NC07
      *a

      Component without harness connected

      (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 communication 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
      4B-21 - MB-16 (LIN2) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door))


    1. for LHD


      1. Disconnect the N17 power window regulator motor assembly (for driver door) connector.

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

        Note

        Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the power switch from on (IG) to off and wait for 60 seconds or more without operating any switches.

        Standard Resistance
        Tester Connection Condition Specified Condition
        4B-21 - N17-9 (LIN) Power switch off Below 1 Ω
        N17-9 (LIN) - Body ground Power switch off 10 kΩ or higher
        4B-21 - Body ground Power switch off 10 kΩ or higher

    2. for RHD


      1. Disconnect the N2 power window regulator motor assembly (for driver door) connector.

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

        Note

        Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the power switch from on (IG) to off and wait for 60 seconds or more without operating any switches.

        Standard Resistance
        Tester Connection Condition Specified Condition
        4B-21 - N2-9 (LIN) Power switch off Below 1 Ω
        N2-9 (LIN) - Body ground Power switch off 10 kΩ or higher
        4B-21 - Body ground Power switch off 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door) - AUXILIARY BATTERY, BODY GROUND)


    1. for LHD


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

        Standard Voltage
        Tester Connection Condition Specified Condition
        N17-2 (B) - N17-1 (GND) 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
        N17-1 (GND) - Body ground Always Below 1 Ω

    2. for RHD


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

        Standard Voltage
        Tester Connection Condition Specified Condition
        N2-2 (B) - N2-1 (GND) 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
        N2-1 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door)


    1. Replace the power window regulator motor assembly (for front passenger door).

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK DTC OUTPUT


    1. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

    2. Recheck for DTCs.


      Body Electrical > Main Body > Trouble Codes
      OK
      DTC B2321 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door) WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here