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CAN COMMUNICATION SYSTEM Bus Buffer ECU Communication Stop Mode

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DTC Code DTC Name
  Bus Buffer ECU Communication Stop Mode
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DESCRIPTION

Detection Item Symptom Trouble Area
Bus Buffer ECU Communication Stop Mode

Either condition is met:


  • Communication stop for "Accessory Gateway" is indicated on the "Communication Bus Check" screen of the GTS.

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  • Communication stop history for "Accessory Gateway" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Accessory Gateway" is 6 or more.)

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  • Communication system DTCs (DTCs that start with U) that correspond to "Bus Buffer ECU Communication Stop Mode" in "DTC Combination Table" are output.

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  • Option connector (bus buffer ECU) branch wire or connector

  • Option connector (bus buffer ECU)
Table 1. *a Dealer-installed Option *b No. 1 CAN Junction Connector *c Option Connector (Bus Buffer ECU)
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Note:

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

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  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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  • Some parts must be initialized and set when replacing or removing and installing parts.

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  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the power switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.

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Tip:

  • Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.

  • When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

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PROCEDURE


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    CHECK OPTIONS


    1. Check whether dealer installed options that support CAN communication are installed.

      Result
      Result Proceed to
      Installed A
      Not installed B

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    CHECK FOR OPEN IN CAN BUS WIRE (OPTION CONNECTOR [BUS BUFFER ECU] BRANCH WIRE)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the G151 option connector (bus buffer ECU).*

      *: When a dealer-installed option is installed

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G151-2 (CAN+) - G151-1 (CAN-) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      CHECK DEALER-INSTALLED OPTION

    • NG

      REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR

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    CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

      *: When a dealer-installed option is installed

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Central Gateway / Utility / Initialization.


      1. Body Electrical > Central Gateway > Utility
        Tester Display
        Initialization




    5. Enter the following menus: Body Electrical / Main Body / Utility / Initialization.


      1. Body Electrical > Main Body > Utility
        Tester Display
        Initialization




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


      1. Body Electrical > Main Body > Clear DTCs


    7. Enter the following menus: Body Electrical / Main Body / Clear DTCs.


      1. 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

    • A

      END

    • B

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