It literally sounds just like that. I got into the car and thought my cell was going off. Car off, no ignition..just simply opening the door. I turned the car on and it still does it. It vibrates, 3 second pause...repeat. No CD is in the player, turning the infotainment system off does nothing. It starts as soon as the dash received power and stops about 5 seconds after the door is closed and lock and then the car powers down. I just discovered this before heading to work so I haven't had much time to play with it other then what I have listed.