Hi Lexus friends, I need help. I owned a 2001 LS430 with an ultra luxury package. It has two controls for audio system. Recently, I couldn't turn on and off the audio system from the driver seat. I have taken the car to the dealer for checking. They told me the information they got from the computer was limited. They wanted me to take the vehicle back to diagnosis. What do you guys think? Anybody has any suggestions. Your advice is appreciated.