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ENTRY AND START SYSTEM(for Start Function), Diagnostic DTC:B2779

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DTC Code DTC Name
B2779 Engine Starter Communication Malfunction
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DESCRIPTION

If the remote engine start ECU does not respond to the certification ECU (smart key ECU assembly) or the remote engine start ID is not registered*, this DTC is stored.

If communication between the remote engine start ECU and the certification ECU (smart key ECU assembly) is established and the remote engine start is operated, this DTC and the corresponding history DTC will be cleared.

Tip:

*: Registration status of the remote engine start ECU ID can be checked using the "Wireless C Code" item in the Data List.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2779 Engine Starter Communication Malfunction When the remote engine start is operated to try to turn the power source on, or start the hybrid control system, the remote start function tries to communicate with the smart key ECU assembly (certification ECU), but communication fails (1 trip detection logic*)

  • CAN communication system

  • Remote start ECU (genuin part)

  • Main body ECU (multiplex network body ECU)

  • Certification ECU (smart key ECU assembly)

DTC output confirmation operation:


  • Always

Table 1. Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
The hybrid control system cannot be started with a remote start operation The hybrid control system cannot be started with a remote start operation only
Table 2. Related Data List and Active Test
DTC No. Data List and Active Test
B2779
  • Entry&Start

  • Wireless Starter ComID

  • Wireless C Code
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CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the power switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • The entry and start system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

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  • Before replacing the certification ECU (smart key ECU assembly) or main body ECU (multiplex network body ECU), refer to the Service Bulletin.

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

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PROCEDURE


  1. Click here

    CHECK CAN COMMUNICATION SYSTEM


    1. Check for CAN communication system DTCs.

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      OK
      CAN communication DTCs are not output.
      Result
      Proceed to
      OK
      NG

  2. Click here

    READ VALUE USING GTS (WIRELESS C CODE)


    1. Enter the following menus: Body Electrical / Entry&Start / Data List.

    2. Read the Data List according to the display on the GTS.


      1. Body Electrical > Entry&Start > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Wireless C Code Registration status between remote engine starter ECU and certification ECU (smart key ECU assembly) No Regd or Regd

        No Regd: Remote starter ID not registered to remote engine start ECU and certification ECU (smart key ECU assembly)

        Regd: Remote starter ID registered to remote engine start ECU and certification ECU (smart key ECU assembly)

        Problems may be caused by the following:


        • DTC B2779 is stored.

        • Remote engine start ECU registration has not been performed.

        • Malfunctions in the certification ECU (smart key ECU assembly) or remote engine start ECU.



      1. Body Electrical > Entry&Start > Data List
        Tester Display
        Wireless C Code




      Result
      Result Proceed to
      "No Regd" is displayed on the GTS A
      "Regd" is displayed on the GTS B

  3. Click here

    REGISTER REMOTE ENGINE STARTER ID


    1. Register the remote engine starter ID.

      Tip:

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

  4. Click here

    CHECK REMOTE ENGINE STARTER FUNCTION


    1. Check the remote engine starter function.

      OK
      Remote engine starter functions operate normally.
      Result
      Proceed to
      OK
      NG

    • OK

      END (REMOTE ENGINE STARTER ID WAS NOT REGISTERED)

    • NGClick here

      GO TO STEP 5

  5. Click here

    CHECK REMOTE ENGINE STARTER ECU


    1. Temporarily replace the remote engine starter ECU with a new one.

    2. Register the remote engine starter ID.

      Tip:

      Refer to Service Bulletin.

    3. Check the remote engine starter function.

      OK
      Remote engine starter functions operate normally.
      Result
      Proceed to
      OK
      NG

    • OK

      END (REMOTE ENGINE STARTER ECU WAS DEFECTIVE)

    • NGClick here
  6. Click here

    CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. Replace the main body ECU (multiplex network body ECU) with a new one.

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    2. Check the remote engine starter function.

      OK
      Remote engine starter functions operate normally.
      Result
      Proceed to
      OK
      NG

    • OK

      END (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) WAS DEFECTIVE)

    • NG

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)