Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: ID-BOX Calibration / Parameter Memory Failure (B279046)

Toyota Corolla Cross (2022-2025) Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Start Function, Hev Model) / ID-BOX Calibration / Parameter Memory Failure (B279046)

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

B279046

ID-BOX Calibration / Parameter Memory Failure

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 ignition switch is turned off or to ON while the electrical key transmitter sub-assembly is being carried).
  • *: Only output while a malfunction is present.
Vehicle Condition and Fail-safe Operation when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Operation when Malfunction Detected
  • Ignition switch ON (READY): Hybrid control system cannot be started next time
  • Hybrid control system stopped: Hybrid control system cannot be started

-
Related Data List and Active Test

DTC No.

Data List and Active Test

B279046

-

CAUTION / NOTICE / HINT

NOTICE:

  • When using the GTS with the ignition 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 / Start Key(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.

  • The smart key system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.

    Click here

  • Before replacing the ID code box (immobiliser code ECU), refer to Registration.

    Click here

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

PROCEDURE

1.

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

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

Click here

NEXT

2.

CLEAR DTC

(a) Using the GTS, clear the DTCs.

Body Electrical > Smart Key > Clear DTCs
NEXT

3.

REGISTER RECOGNITION CODE

(a) Register the recognition codes to the ECUs.

Click here

NEXT

4.

REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID codes.

Click here

NEXT

5.

CHECK DTC

(a) Using the GTS, check if DTC is output.

Body Electrical > Smart Key > Trouble Codes

Result

Proceed to

DTC B279046 is output

A

DTC B279046 is not output

B
A

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

B

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

    READ NEXT:

     Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid (B279986)

    DESCRIPTION If there is a communication malfunction between the hybrid vehicle control ECU and ID code box (immobiliser code ECU), or when the communication ID codes do not match, the hybrid vehicle c

     Engine Immobiliser System Circuit Short to Battery (B279A12)

    DESCRIPTION If the communication line (IMI - EFIO) between the hybrid vehicle control ECU and ID code box (immobiliser code ECU) is stuck high, the hybrid vehicle control ECU will store this DTC.

     Engine Immobiliser System Incorrect Assembly (B279C95)

    DESCRIPTION If a hybrid vehicle control ECU that is incompatible with the immobiliser function is installed, the hybrid vehicle control ECU will store this DTC. DTC No. Detection Item DTC

    SEE MORE:

     Stop and Start Priority Control System

    DESCRIPTION In stop and start control status, there is normal status (Standard) and stop and start priority status (Extended). Stop and start control status can be switched to the desired mode by operating the steering pad switch assembly, and the mode change is also shown on the multi-information

     Removal

    REMOVAL CAUTION / NOTICE / HINT COMPONENTS (REMOVAL) Procedure Part Name Code 1 STEERING WHEEL ASSEMBLY 45100 - - - 2 ALIGN FRONT WHEELS FACING STRAIGHT AHEAD - - - 3 LOWER STEERING COLUMN COVER 4

    © 2020-2025 Copyright www.tcorollacross.com PT NL