Ok, my 240d has pretty much the same problem, the cruise will "kick in" when you hold the set/accel, but as soon as you release it quits. I "resoldered" the amp and now it doesn't work at all.

Does anyone have a schematic to help me debug the connections/switches? I don't have another amp to try, so I want to make sure that it is the problem before I shell out the $$$ for another one.

Thanks.