IMMOBILISER SYSTEM(w/ Entry and Start 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 (immobiliser code ECU) even though the ID code box (immobiliser code ECU) is not registered, the certification ECU (smart key ECU assembly) stores this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B278D

Malfunction of ID-BOX Recognition

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 (immobiliser code ECU) or not is provided even though the ID code box (immobiliser code ECU) is not registered.

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

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

Misconnection of the ID code box (immobiliser code ECU)

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

Key registration will be prohibited

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Table 2. Related Data List and Active Test

DTC No.

Data List and Active Test

B278D

-

CAUTION / NOTICE / HINT

Note:

  • Before performing following 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 the Service Bulletin.

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

PROCEDURE

  1. CLEAR DTC

    1. Clear the DTCs.

      Click hereClick here

      Body Electrical > Entry&Start > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  2. CHECK DTC OUTPUT

    1. Check for DTCs.

      Click hereClick here

      Body Electrical > Entry&Start > Trouble Codes

      Tip:

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

    Result

    Proceed to

    DTC B278D is not output

    DTC B278D is output
    DTC B278D is not output

    END

    DTC B278D is output

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)