Hi Atebit,
You mentioned above that when you disconnected the Radio, you lost steering wheel display, etc. Think i've got the same on my RX300, the Radio was connected by my Pioneer guy and said the heat/aircon/buttons display did not work. How did u manage to get a workaround to this. I'm tryin to fit an aftermarket Pioneer sat nav to my UK Lexus RX300, which i believe is called RX300 0r 350 in the states.
Thanks