1st Gen R52 Cooper Convertible Most liked posts in thread: Sunroof opens, but goes no further

part num.?

I've got the same problem and I'm outta warranty. Gonna check that switch that you had replaced,......oh and where is it?

 

I'm guessing it was one of the hall sensors. Check here for some diagrams and more info:

BMW TIS - 54 34 ... Overview of Hall sensors in convertible top