Room Oscillator Circuit: Description
WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
The certification ECU activates the electrical key oscillators (console and rear seat). The power is supplied from the certification ECU to both the electrical key oscillators (console and rear seat). The electrical key oscillators (console and rear seat) circuits have the same wiring. If the smart access system with push-button start does not operate properly inside the vehicle, check both the electrical key oscillators (console and rear seat) circuits.