Hi Shonky,

I would have expected the M3 to be using a high speed (500 kbit/s) CAN bus with the ODBII info probably being transmitted using the KWP2000 (German) protocol. There should also be a second low or medium speet CAN bus in the car for non-critical systems running at 125 kbit/s. Well that would be my guess, assuming that the German manufacturers all use similar standards these days.

Even if you can't interpret the information, you should at least be able to see traffic on the bus using your diagnosis tool.

Hmmm, how old is your M3?

Cheers
Derek