CAN COMMUNICATION SYSTEM(for LHD) Bus Buffer ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Bus Buffer ECU Communication Stop Mode

Either condition is met:


  • "Accessory Gateway" is not displayed on "CAN Bus Check".

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

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  • Bus buffer ECU CAN branch wire or connector

  • Bus buffer ECU

WIRING DIAGRAM

A000191E04
*a No. 2 CAN Junction Connector
*b Bus Buffer ECU
*c Dealer-installed Option

CAUTION / NOTICE / HINT

Note


  • 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, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary 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 auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary battery terminal notice before proceeding with work.

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  • 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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  • 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 at least 20 seconds.

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

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

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS WIRE (BUS BUFFER ECU BRANCH WIRE)


    1. B002JPFC01
      *a

      Front view of wire harness connector

      (to Bus Buffer ECU)

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

    2. Disconnect the bus buffer ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I130-4 (CAN+) - I130-8 (CAN-) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BUS BUFFER ECU

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (BUS BUFFER ECU)