I recently replaced the battery on my 99 C280 and tried using the radio code that was in the owners manual, but it did not work. I am the second owner and I am assuming the previous owner may have had the radio replaced at some point and the new radio code was not saved. Here is the VIN and radio serial#:
VIN: WDBHA29G5XA784786
Radio Model#: BE 3302
Radio Serial#: X1120403