Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 Lexus IS 250C Automatic TransFACTORY OEM SERVICE PROCEDURE
System Description
- DESCRIPTION
- The steering lock system locks/unlocks the steering by activating the steering lock bar with a motor. The steering lock ECU activates the motor based on signals from the certification ECU and power source control ECU.
- FUNCTIONS OF COMPONENTS
- The steering lock ECU controls the system based on information from the following components.
Component Function Steering lock actuator assembly Consists of a motor, lock bar, lock/unlock position sensors, etc. Activated by the steering lock ECU. Steering lock ECU Included in the steering lock actuator assembly. Activates the steering lock motor based on permission signals from the power source control ECU and ID CODE BOX.
Detects steering lock/unlock positions and transmits the status to other ECUs.Power source control ECU Permits the steering lock ECU to supply power to activate the motor. The power source control ECU and certification ECU permit engine start after receiving an unlock signal from the steering lock ECU. Certification ECU The power source control ECU and certification ECU permit engine start after receiving an unlock signal from the steering lock ECU. IG2 relay Controlled by the power source control ECU. Sends IG signals to the steering lock ECU. ID CODE BOX Orders the steering lock ECU to lock/unlock the steering.
- The steering lock ECU controls the system based on information from the following components.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.