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

-
Table 2. Related Data List and Active Test

DTC No.

Data List and Active Test

B278D

-

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(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 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 Service Bulletin.

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

PROCEDURE

  1. CLEAR DTC

    1. Clear the DTCs.

      Body Electrical > Entry&Start > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  2. CHECK DTC OUTPUT

    1. Check for DTCs.

      Body Electrical > Entry&Start > Trouble Codes

      Tip:

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

      OK

      DTC B278D is not output.

    Result

    Proceed to

    OK

    NG
    OK

    END

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)