IMMOBILISER SYSTEM(w/ Entry and Start System), Diagnostic DTC:B2790

DTC Code DTC Name
B2790 ID BOX EEPROM Malfunction

DESCRIPTION

When an internal malfunction occurs in the ID code box (immobiliser code ECU), the certification ECU (smart key ECU assembly) stores this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B2790

ID BOX EEPROM Malfunction

An internal malfunction occurs in the ID code box (immobiliser code ECU) (EEPROM access malfunction) (1 trip detection logic*).

  • ID code box (immobiliser code ECU)

  • Certification ECU (smart key ECU assembly)

DTC output confirmation operation:

An immobiliser set/unset operation is performed (the engine switch is turned off or on [IG] while carrying the key).

*: Only output while a malfunction is present.

Table 1. Vehicle Condition and Fail-safe Operation when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Operation when Malfunction Detected

  • Engine running: Engine cannot be started next time

  • Engine stopped: Engine cannot be started

-
Table 2. Related Data List and Active Test

DTC No.

Data List and Active Test

B2790

-

CAUTION / NOTICE / HINT

Note:

  • Before replacing the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU), refer to the Service Bulletin.

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

PROCEDURE

  1. REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    1. Replace the ID code box (immobiliser code ECU) with a new one.

      Tip:

      Refer to the Service Bulletin.

    Result

    Proceed to

    NEXT
    NEXT

  2. CLEAR DTC

    1. Clear the DTCs.

      Click hereClick here

      Body Electrical > Entry&Start > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  3. REGISTER RECOGNITION CODES

    1. Register the recognition codes in the ECUs.

      Tip:

      Refer to the Service Bulletin.

    Result

    Proceed to

    NEXT
    NEXT

  4. REGISTER ECU COMMUNICATION ID

    1. Register the recognition codes in the ECUs.

      Tip:

      Refer to the Service Bulletin.

    Result

    Proceed to

    NEXT
    NEXT

  5. CHECK FOR DTC

    1. Check for DTCs.

      Click hereClick here

      Tip:

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

      Body Electrical > Entry&Start > Trouble Codes

    Result

    Proceed to

    DTC B2790 is not output

    DTC B2790 is output
    DTC B2790 is not output

    END (ID CODE BOX [IMMOBILISER CODE ECU] WAS DEFECTIVE)

    DTC B2790 is output

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)