System Outline
WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
* Steering lock
Receiving signals from the power switch and the key, the certification ECU assembly sends instructions for locking and unlocking the steering lock to the steering lock actuator assembly (Built into the steering lock) in order to activate the motor. The steering lock actuator assembly detects the position of the lock bar and stops the motor at the specified position.