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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 201 (Lin Communication System (Hybrid) - Diagnostic Codes) >> LIN COMMUNICATION SYSTEM (for HV Model) >> DTC B2325: LIN Communication Bus Malfunction [06/2018 - ] >> Procedure

DTC B2325: LIN Communication Bus Malfunction [06/2018 - ]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (DRIVER DOOR) 
    1. Disconnect the J27 power window regulator motor assembly (driver door) connector.
    2. Clear the DTCs.

      Body Electrical > Main Body > Clear DTCs 

    3. After 8 seconds have elapsed, check if the DTC is output.

      Body Electrical > Main Body > Trouble Codes 

      Result

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

    Result: 

    B 

    REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (DRIVER DOOR). Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  2

  2. CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY 
    1. Disconnect the J20 multiplex network master switch assembly connector.
    2. Clear the DTCs.

      Body Electrical > Main Body > Clear DTCs 

    3. After 10 seconds have elapsed, check if the DTC is output.

      Body Electrical > Main Body > Trouble Codes 

      Result

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

    Result: 

    B 

    REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    A 

    See step  3

  3. CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (FRONT PASSENGER DOOR) 
    1. Disconnect the J5 power window regulator motor assembly (front passenger door) connector.
    2. Clear the DTCs.

      Body Electrical > Main Body > Clear DTCs 

    3. After 10 seconds have elapsed, check if the DTC is output.

      Body Electrical > Main Body > Trouble Codes 

      Result

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

    Result: 

    B 

    REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (FRONT PASSENGER DOOR). Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  4

  4. CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR RH DOOR) 
    1. Disconnect the L4 power window regulator motor assembly (rear RH door) connector.
    2. Clear the DTCs.

      Body Electrical > Main Body > Clear DTCs 

    3. After 10 seconds have elapsed, check if the DTC is output.

      Body Electrical > Main Body > Trouble Codes 

      Result

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

    Result: 

    B 

    REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR RH DOOR). Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  5

  5. CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR LH DOOR) 
    1. Disconnect the L10 power window regulator motor assembly (rear LH door) connector.
    2. Clear the DTCs.

      Body Electrical > Main Body > Clear DTCs 

    3. After 10 seconds have elapsed, check if the DTC is output.

      Body Electrical > Main Body > Trouble Codes 

      Result

      Result Proceed to
      DTC B2325 is output*1 A
      DTC B2325 is output*2 B
      DTC B2325 is not output C
      1. *1: w/ Power Trunk Lid System
      2. *2: w/o Power Trunk Lid System

    Result: 

    B 

    See step  7

    Result: 

    C 

    REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR LH DOOR). Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  6

  6. CHECK KICK DOOR CONTROL SENSOR 
    1. Disconnect the S5 kick door control sensor connector.
    2. Clear the DTCs.

      Body Electrical > Main Body > Clear DTCs 

    3. After 10 seconds have elapsed, check if the DTC is output.

      Body Electrical > Main Body > Trouble Codes 

      Result

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

    Result: 

    B 

    REPLACE KICK DOOR CONTROL SENSOR. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  7

  7. CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) 
    1. Disconnect the P22 sliding roof ECU (sliding roof drive gear sub-assembly) connector.
    2. Clear the DTCs.

      Body Electrical > Main Body > Clear DTCs 

    3. After 10 seconds have elapsed, check if the DTC is output.

      Body Electrical > Main Body > Trouble Codes 

      Result

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

    Result: 

    B 

    REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - EACH ECU) 
    1. Disconnect the 3H instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3H-25 - Body ground Always 10 kΩ or higher
    3. Disconnect all other connectors in the same circuit.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3H-25 - Other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)) 
    1. Disconnect the 3D instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3D-17 - Body ground Always 10 kΩ or higher
      3D-17 - Other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly.

      Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
      GTY796691Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)      		 - -
    3. Measure the resistance according to the value(s) in the table below.

      HINT: 

      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
      3H-25 - 3D-3 Always 10 kΩ or higher
      MB-16 (LIN2) - Other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    OK 

    See step  11

  11. INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 
    1. Install the main body ECU (multiplex network body ECU) to the instrument panel junction block assembly.

      Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    2. Install the instrument panel junction block assembly.
      GTY804660Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Instrument Panel Junction Block Assembly)      		 *b Waveform
    3. Using a Techstream, check the waveform.

      HINT: 

      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).

      OK

      Tester Connection Condition Tool Setting Specified Condition
      3H-25 - Body ground Power switch on (IG) 2 V/DIV., 200 ms/DIV. Pulse generation
      (See waveform)
      3D-17 - Body ground Power switch on (IG) 2 V/DIV., 200 ms/DIV. Pulse generation
      (See waveform)

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ] 

    Result: 

    NG 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

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