I just had a new cd head unit installed in my 92 es. I am taking it back tomorrow to be fixed because it had several problems. First it makes a annoying sound that gets louder when the car accelerates (engine noise), the rear speakers dont work, and when the car is cold the unit shuts off when i brake, put the car into gear, turn on the signals, and sometimes when the antilocks engage. Its completely ridiculous and im very upset so hopefully it gets fixed. IF i still have some problems does anyone know what i could do? I wont be having anything installed at this place ever again, at least not on a lexus. Thanks in advance.