For all those who can understand German:
OBC installation 57 pages,
http://www.gunnar525.de/screwings/bc4_einbau.pdf

installing a plug in a BC without code plug
http://www.gunnar525.de/screwings/bc...ierstecker.pdf
BC FAQ
http://www.gunnar525.de/screwings/bc4_faq.pdf

The best instructions on the net, even if you do not understand German, the pics will help.