According to the documentation found on this forum, the 218 unit is not known to work...
Getting a new unit from dealer or online is best bet, use yours as the core, ~$320 I think people have said...
Read through this thread some. http://www.xoutpost.com/electronics/...i-bus-car.html
Hope that helps some...
Matt
BTW, The cradle mentioned above is for a ULF unit and shouldn't apply to the TCU I believe.