I just picked up a 98 C280. it has a CM2396 cassette radio with a CD changer and Bose speakers. The radio was in code mode when i got it. I found a code on a paper in the glove box. Tried it but it didn't work. I called the dealer and got the same # using the serial # and the Vin #. I enter it 3 time and it locks out. Is there a different # for the changer or am i doing something wrong ?

Any help would be appreciated Thanks.