I bought a 2012 JKU Sport S a month ago. I noticed after I turn the Jeep off and I am sitting there for a minute I will hear almost what seems to be like a electric motor type noise coming from the dash in the area of the radio. If I leave and come back it still makes the noise every so often when the Jeep is off. It lasts only a second or two, is not loud or annoying, but I have no idea what it is. Almost sounds like it could be the CD player but I don't have a CD in there.