Circuit Description
WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
The theft deterrent ECU activates the front and rear room oscillators. The power is supplied from the driver side J/B to both the room oscillators. The front and rear room oscillator circuits have the same wiring. If the smart key system does not operate properly inside the vehicle, check the circuit for these oscillators.