I just purchased a 2000 ML320 with 66k miles on it. Took it on a road trip this wknd. After about an hour on the road and from switching from a CD to the radio, none of the controls worked. I had to pull over, turn the car off so that the radio would turn off. When I restarted the vehicle, the entire Bose system would not turn on and I heard a whirring sound the rest of the trip. That stopped later that day but now nothing is operational with the system. Any suggestions? Thanks in advance.