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 RX 350 AWDFACTORY OEM SERVICE PROCEDURE
System Description
- DESCRIPTION
- The steering lock system locks/unlocks the steering wheel when by activating the steering lock bar with a motor. The steering lock ECU (steering lock actuator assembly) activates the motor based on signals from the certification ECU (smart key ECU assembly) and power management control ECU.
- A Local Interconnect Network (LIN) is used for communication between different ECUs in this system.
- FUNCTIONS OF COMPONENTS
- The steering lock ECU (steering lock actuator assembly) controls the system based on information from the following components.
Component Function Steering lock ECU (Steering lock actuator assembly) - Consists of a motor, lock bar, lock/unlock position sensors, etc. activated by the steering lock ECU (steering lock actuator assembly).
- Included in the steering lock actuator assembly. Activates the steering lock motor based on permission signals from the power management control ECU.
- Detects steering lock/unlock positions and transmits the status to other ECUs.
Power management control ECU Permits the steering lock ECU (steering lock actuator assembly) to supply power to activate the motor. The power management control ECU and certification ECU (smart key ECU assembly) permit engine start after receiving an unlock signal from the steering lock ECU (steering lock actuator assembly). Certification ECU (Smart key ECU assembly) The power management control ECU and certification ECU (smart key ECU assembly) permit engine start after receiving an unlock signal from the steering lock ECU (steering lock actuator assembly). IG2 relay Controlled by the power management control ECU. Sends IG signals to the steering lock ECU (steering lock actuator assembly).
- The steering lock ECU (steering lock actuator assembly) 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.