The sound is as if the radio was just turned on but not connected to any radio station. The rear sensors were as fitted as new with the car. they have not been added to the car.
What do you mean by saying Read sensor are not plugged to car harness. I have not touched the rear sensors or the wiring so why should they be causing any troubles. What is making the car radio noise come on and off when I am not switching it on or off.