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

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Start Function, Gasoline 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
Engine starting: Engine cannot be started next time Engine stopped: Engine 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 the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. 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.
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Before replacing the ID code box (immobiliser code ECU), refer to Registration.
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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

CLEAR DTC

(a) Using the GTS, clear the DTCs.

Body Electrical > Smart Key > Clear DTCs

3.	REGISTER RECOGNITION CODE

(a) Register the recognition codes to the ECUs.

Click here

4.	REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID codes.

Click here

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

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

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

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