'00 ML 55 with 40k Miles. While on a 3 hr road trip I attempted to change the volume level on the radio station I was listening to, no response, tried to turn off the MCS, no response, pressed other buttons, same problem. I pulled off the road and turned off the ignition for a few seconds. Turned engine back on, the MCS was now dead, wouldn't turn back on. Traveled down the road for another 1/2 hr. Pulled into a gas station. While I was filling up, took a look at the fuses in the fuse box. I pulled two fuses that looked like they were associated with the MCS (F10 & F21). They looked go so plugged them back in. Started the car back up and the MCS came on with a message to enter the security code, after the code was entered everything appeared to work. What's going on. Only thing I can possibly figure out is one of the fuses had a poor connection, but why did it stay on with no control response?