System Outline
WARNING: This page is about a different car, the 2008 Lexus IS 350 and 2008 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
* Steering lock
Receiving signals from the power SW and the key, the certification ECU sends instructions for locking and unlocking the steering lock to the steering lock ECU (Built into the steering lock) in order to activate the motor. The steering lock ECU detects the position of the lock bar and stops the motor at the specified position.