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

DTC Code DTC Name
B2779 Engine Starter Communication Malfunction

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.

Tech Tips

*: 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 engine, 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

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
The engine cannot be started with a remote start operation The engine cannot be started with a remote start operation only
Related Data List and Active Test
DTC No. Data List and Active Test
B2779

    Entry&Start

  • Wireless Starter ComID

  • Wireless C Code

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine 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.

    Click here

  • 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".

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check for CAN communication system DTCs.

      Click here

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

    NG

    GO TO CAN COMMUNICATION SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Click here

    OK

  2. 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.


      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.

      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

    B

    CHECK REMOTE ENGINE STARTER ECU Click here

    A

  3. REGISTER REMOTE ENGINE STARTER ID


    1. Register the remote engine starter ID.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  4. 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)

    NG

  5. CHECK REMOTE ENGINE STARTER ECU


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

    2. Register the remote engine starter ID.

      Tech Tips

      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)

    NG

  6. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


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

      Click here

    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)