I have a 2008 328i and a couple months ago all of the speakers in my car began to pop non-stop constantly (even when the car is off). I took out the stereo to see if i could determine a problem with the stereo or wiring in the car and i noticed a red light in the stereo box that would turn off at the same time that the speakers would pop. what is the purpose of the red light? and could it possibly have anything to do with the popping in my speakers?