All of a sudden I lost the functionality of my Automatic speed-sensitive volume adjustment 1996 C 280. I have a Premium Bose system, Original from MB, never replaced the Radio or anything. I did search hard on this Forum for any past posts, but I do not see any instructions on how to fix/adjust to bring back what I used to have. It is not in my Owner's Manual either. Does someone knows what/where/how to fix the Automatic speed-sensitive volume adjustment ? Please ? Thanks