IMMOBILISER SYSTEM(w/ Entry and Start System), 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.

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

One of the following conditions is met (1 trip detection logic*):


  • A remote start communication error occurs.

  • Response is not possible.

  • Registration has not been performed.

  • Remote engine start ECU

  • Main body ECU (multiplex network body ECU)

  • Certification ECU (smart key ECU assembly)

DTC output confirmation operation:


  • A remote start operation is performed.

*: Only output while a malfunction is present.

DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition - ○ ○ ○
Malfunction Status A remote start communication error occurs. ○ - -
Response is not possible. - ○ -
Registration has not been performed. - - ○
Detection Time - - -
Number of Trips 1 trip 1 trip 1 trip
Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Engine does not start with remote start operation Engine cannot be started by remote start operation only
Related Data List and Active Test
DTC No. Data List and Active Test
B2779

  • Wireless Starter Com ID

  • 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 the vehicle type under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). 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.

  • Before performing the inspection, check that DTC B1242 (wireless door lock control) is not output.

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

  • After performing repairs, 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. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

    6. 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 Remote starter ID 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

    REPLACE REMOTE ENGINE STARTER ECU Click here

    A

  3. REGISTER REMOTE ENGINE STARTER ID


    1. Register the remote engine starter ID.

      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. REPLACE REMOTE ENGINE STARTER ECU


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

      Tech Tips

      Register the remote engine starter ID.

    2. 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. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


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


    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)