BMW Planet has lots of useful technical information as a similar pdf file download.
This is for the BC1 for example:
http://www.bmw-planet.com/lib/mini/BODY%20CONTROL%20MODULE.pdf
Download of all 89 MINI technical pdfs here (545MB zipped):
http://www.bmw-planet.com/2011/11/05/lib-mini-technical-documents/