LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2325

DTC Code DTC Name
B2325 LIN Communication Bus Malfunction

DESCRIPTION

The main body ECU (multiplex network body ECU) monitors communication between all the ECUs connected to the door bus lines. When the main body ECU (multiplex network body ECU) detects errors in communication with all the ECUs connected to the door bus lines at 2.6-second intervals and 3 times in a row, DTC B2325 will be stored.

DTC No. DTC Detection Condition Trouble Area
B2325 Main body ECU (multiplex network body ECU) detects errors in communication with the ECUs connected to the door bus lines 3 times in a row.

  • Power window regulator motor assembly RH (for driver side)*1

  • Power window regulator motor assembly LH (for driver side)*2

  • Double lock door control relay assembly*3

  • Instrument panel junction block assembly

  • Main body ECU (multiplex network body ECU)

  • Instrument panel junction block assembly

  • Wire harness or connector

WIRING DIAGRAM

A01VKVYE04

CAUTION / NOTICE / HINT

Note


  • 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 ignition 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. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B2325 is output A
      DTC B2325 is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    A01VM7NE02
    Text in Illustration
    *a

    Component without harness connected

    (Instrument Panel Junction Block Assembly)

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

    2. Disconnect the 3B instrument panel junction block assembly connectors.

    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
      3B-12 - MB-16 (LIN2) Always Below 1 Ω
      3B-26 - MB-16 (LIN2)*1 Always Below 1 Ω
      3B-12 or MB-16 (LIN2) - Body ground Always 10 kΩ or higher
      3B-26 or MB-16 (LIN2) - Body ground*1 Always 10 kΩ or higher

      *1: w/ Double Locking Function


    NG

    REPAIR OR REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - EACH ECU)


    1. Disconnect the G3 power window regulator motor assembly RH (for driver side)*1 or H3 power window regulator motor assembly LH (for driver side)*2 connector.

    2. Disconnect the F79 double lock door control relay assembly*3 connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      3B-12 - G3-9 (LIN)*1

      3B-12 - H3-9 (LIN)*2

      		 Always Below 1 Ω
      3B-26 - F79-9 (MPX1)*3 Always Below 1 Ω

      3B-12 or G3-9 (LIN) - Body ground*1

      3B-12 or H3-9 (LIN) - Body ground*2

      		 Always 10 kΩ or higher
      3B-26 or F79-9 (MPX1) - Body ground*3 Always 10 kΩ or higher

      • *1: for RHD

      • *2: for LHD

      • *3: w/ Double Locking Function


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK DTC OUTPUT (POWER WINDOW REGULATOR MOTOR ASSEMBLY)


    1. Install the main body ECU (multiplex network body ECU) to the instrument panel junction block assembly Click here.

    2. Reconnect the 3B instrument panel junction block assembly connectors.

    3. Reconnect the F79 double lock door control relay assembly connector.*1

    4. Clear the DTC Click here.

    5. After 10 seconds have elapsed, check if the trouble occurs again.

    6. Check for DTCs again.

      Result
      Result Proceed to
      DTC B2325 is output (w/ Double Locking Function) A
      DTC B2325 is output (w/o Double Locking Function) B
      DTC B2325 is not output (for RHD) C
      DTC B2325 is not output (for LHD) D

      • *1: w/ Double Locking Function


    B

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

    C

    REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (for Driver Side) Click here

    D

    REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (for Driver Side) Click here

    A

  6. CHECK DTC OUTPUT (DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY)


    1. Reconnect the G3 power window regulator motor assembly RH (for driver side)*1 or H3 power window regulator motor assembly LH (for driver side)*2 connector.

    2. Disconnect the F79 double lock door control relay assembly connector.

    3. Clear the DTC Click here.

    4. After 10 seconds have elapsed, check if the trouble occurs again.

    5. Check for DTCs again.

      Result
      Result Proceed to
      DTC B2325 is output A
      DTC B2325 is not output B

      • *1: for RHD

      • *2: for LHD


    A

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

    B

    REPLACE DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY Click here