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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 234 (Can Communication System (Hybrid) - Circuit Tests (1 Of 4) & Diagnostic Codes) >> CAN COMMUNICATION SYSTEM (for HV Model) >> Bus Buffer ECU Communication Stop Mode [06/2018 - 08/2021] >> Procedure

Bus Buffer ECU Communication Stop Mode [06/2018 - 08/2021]: 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 OPTIONS 
    1. Check whether dealer installed options that support CAN communication are installed.

      Result

      Result Proceed to
      Installed A
      Not installed B

    Result: 

    B 

    See step  4

    Result: 

    A 

    See step  2

  2. CHECK FOR OPEN IN CAN BUS LINES (OPTION CONNECTOR (BUS BUFFER ECU) BRANCH LINE) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the G80 option connector (bus buffer ECU).

      HINT: 

      Disconnect any CAN compatible optional devices from the option connector.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      G80-2 (CAN+) - G80-1 (CAN-) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      GTY803805Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Option Connector (Bus Buffer ECU))

      Result

      Result 
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (OPTION CONNECTOR (BUS BUFFER ECU)) 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G80-5 (GND) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      GTY803804Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Option Connector (Bus Buffer ECU))
    2. Reconnect the cable to the negative (-) auxiliary battery terminal.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G80-3 (R+B) - Body ground Power switch off 11 to 14 V

      Result

      Result 
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE CAN COMPATIBLE OPTIONAL DEVICE 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

  4. CHECK FOR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Main Body / Utility / Initialization.

      Body Electrical > Main Body > Utility 

      Tester Display
      Initialization
    5. Enter the following menus: Body Electrical / Central Gateway / Utility / Initialization.

      Body Electrical > Central Gateway > Utility 

      Tester Display
      Initialization
    6. Enter the following menus: Body Electrical / Main Body / Clear DTCs.

      Body Electrical > Main Body > Clear DTCs 

    7. Enter the following menus: Body Electrical / Main Body / Trouble Codes.

      Body Electrical > Main Body > Trouble Codes 

      Result

      Result Proceed to
      DTC U1117 is not output from main body ECU (multiplex network body ECU) A
      DTC U1117 is output from main body ECU (multiplex network body ECU) B

    Result: 

    A 

    END 

    Result: 

    B 

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

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