Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028K9W
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): B278196; Steering Lock System Component Internal Failure; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]

DTC

B278196

Steering Lock System Component Internal Failure

DESCRIPTION

except Manual Transaxle

  • As this DTC is not normally output, it may be due to noise in the LIN communication system, etc.

    DTC No.

    Detection Item

    DTC Detection Condition

    Trouble Area

    Note

    B278196

    Steering Lock System Component Internal Failure

    Noise in the LIN communication system, etc.

    ID code box (immobiliser code ECU)

    No confirmation operation is necessary (monitoring is continuous).

    Vehicle Condition and Fail-safe Function when Malfunction Detected

    Vehicle Condition when Malfunction Detected

    Fail-safe Function when Malfunction Detected

    The engine cannot be started.

    -

    Related Data List and Active Test Items

    DTC No.

    Data List and Active Test

    B278196

    -

for Manual Transaxle

  • The steering lock ECU and steering lock motor are built into the steering lock actuator or upper bracket assembly.

    The steering lock ECU (steering lock actuator or upper bracket assembly) detects whether the steering lock is in the lock or unlock position by using the lock sensor and unlock sensor of the steering lock motor.

    The steering lock ECU (steering lock actuator or upper bracket assembly) receives lock and unlock request signals from the certification ECU (smart key ECU assembly) and responds with lock and unlock operation signals.

    HINT:

    The steering lock ECU (steering lock actuator or upper bracket assembly) is not connected to the CAN communication system. However, the steering lock ECU (steering lock actuator or upper bracket assembly) is connected to the certification ECU (smart key ECU assembly) via LIN communication and communicates with other components via CAN communication through the certification ECU (smart key ECU assembly).

    DTC No.

    Detection Item

    DTC Detection Condition

    Trouble Area

    Note

    B278196

    Steering Lock System Component Internal Failure

    One of the following conditions is met (1-trip detection logic (Only output while a malfunction is present and the ignition switch is ON.)):

    • The steering lock sensor or unlock sensor is malfunctioning (When both detection switches turn on, the system is determined to be malfunctioning).
    • The steering lock motor activation circuit has a short circuit.
    • The steering lock motor activation circuit has an open circuit.
    • Steering lock ECU (steering lock actuator or upper bracket assembly)
    • LIN communication system

    DTC Output Confirmation Operation:

    • No confirmation operation is necessary (monitoring is continuous).

    Vehicle Condition and Fail-safe Function when Malfunction Detected

    Vehicle Condition when Malfunction Detected

    Fail-safe Function when Malfunction Detected

    The steering cannot be locked or unlocked. For this reason, the engine cannot be started.

    Prohibits the engine from being started (the engine does not start).

    Related Data List and Active Test Items

    DTC No.

    Data List and Active Test

    B278196

    Smart Key

    • Sensor Malfunction History
    • Motor Driver Short History
    • Lock Bar Stuck Error History

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 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

  • Before replacing the ID code box (immobiliser code ECU)*1 or steering lock ECU (steering lock actuator or upper bracket assembly)*2, refer to Registration.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

    • *1: except Manual Transaxle
    • *2: for Manual Transaxle
  • After performing repairs, confirm that no DTCs are output again.

    Click here 2023 MY Corolla Corolla Hatchback GR Corolla [11/2022 - 03/2023]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): DIAGNOSTIC TROUBLE CODE CHART 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [03/2023 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): DIAGNOSTIC TROUBLE CODE CHART

HINT:

When all the ECUs that are connected via LIN communication cannot communicate with the certification ECU (smart key ECU assembly), DTC B278588 is stored.

PROCEDURE

1.

SYSTEM CHECK

(a) Check the vehicle specification.

Result

Proceed to

for Manual Transaxle

A

except Manual Transaxle

B
B

GO TO STEP 3

A

2.

CHECK DTC

(a) Using the GTS, check if LIN communication DTC B278588 is output.

Body Electrical > Smart Key > Trouble Codes

HINT:

If a LIN communication DTC is output, perform troubleshooting for the LIN communication system.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; NETWORKING: LIN COMMUNICATION SYSTEM: DIAGNOSTIC TROUBLE CODE CHART

Result

Proceed to

B278588 is output

A

B278588 is not output

B
A

GO TO LIN COMMUNICATION SYSTEM (DTC B278588)

B

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

3.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Smart Key > Clear DTCs

NEXT

4.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Smart Key > Trouble Codes

Result

Proceed to

B278196 is output

A

B278196 is not output

B
A

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

B

END