Toyota Yaris: Smart Key System (for Start Function) / Steering Lock System Component Internal Failure (B278196)
DESCRIPTION
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.)):
|
| DTC Output Confirmation Operation:
|
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). |
| DTC No. | Data List and Active Test |
|---|---|
| B278196 | Smart Key
|
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 steering lock ECU (steering lock actuator or upper bracket assembly), refer to Registration.
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-
After performing repairs, confirm that no DTCs are output again.
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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. | CHECK DTC |
(a) Using the GTS, check if LIN communication DTC B278588 is output.
Body Electrical > Smart Key > Trouble CodesHINT:
If a LIN communication DTC is output, perform troubleshooting for the LIN communication system.
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| Result | Proceed to |
|---|---|
| DTC B278588 is output | A |
| DTC 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) |
Wireless Starter Component Internal Failure (B277A96)
DESCRIPTION If the remote engine start ECU does not respond to the certification ECU (smart key ECU assembly) or the remote engine start ID is not registered, this DTC is stored...
Power Source Control System Circuit Short to Ground (B278211)
DESCRIPTION The certification ECU (smart key ECU assembly) has a power source mode switching function. This DTC is stored when the IGE input (the steering lock motor activation permission signal) sent directly from the certification ECU (smart key ECU assembly) to the steering lock ECU (steering lock actuator or upper bracket assembly) is determined to be abnormal...
Other information:
Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Precaution
PRECAUTION CAN COMMUNICATION SYSTEM TROUBLESHOOTING (a) Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output...
Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Components
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Keys
To use the auxiliary key, press the knob and pull out the auxiliary key from the smart key.
