ENGINE IMMOBILISER SYSTEM (w/ Smart Key System), Diagnostic DTC:B278D

DTC Code DTC Name
B278D Malfunction of ID-BOX Recognition

DESCRIPTION

When the certification ECU (smart key ECU assembly) detects an input signal indicating that the vehicle is equipped with an ID code box even though the ID code box is not registered, the certification ECU (smart key ECU assembly) stores this DTC.

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B278D

One of the following conditions is met:


  • The certification ECU (smart key ECU assembly) recognizes that the wire harness judging whether the vehicle is equipped with an ID code box or not is provided even though the ID code box is not registered.

  • The certification ECU (smart key ECU assembly) receives a LIN signal from the ID code box even though the ID code box is not registered.

  • The certification ECU (smart key ECU assembly) receives a LIN signal from the ID code box even though the wire harness judging whether the vehicle is equipped with an ID code box or not is not provided.

 Misconnection of the ID code box Always

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Key registration will be prohibited -
Related Data List and Active Test
DTC Code Data List and Active Test
B278D -

INSPECTION PROCEDURE

Note


  • Before performing following inspection procedure, check that the ID code box (immobiliser code ECU) is not installed on the vehicle.

  • Before replacing the certification ECU (smart key ECU assembly), refer to Registration Click here.

  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK DTC OUTPUT


    1. Check for DTCs Click here.

      Tech Tips

      Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

      OK
      DTC B278D is not output.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

    END