Get a copy of BMW TIS & BMw ETK from EBay, it's as good a manual as it gets.

Here's an online version for TIS on a Russian website, hence the need for google translate.

http://translate.google.ca/translate?hl=en&sl=ru&u=http://tis.bmwcats.com/&prev=/search%3Fq%3Donline%2Bbmw%2Btis%26hl%3Den%26client %3Dfirefox-a%26hs%3DbQ6%26tbo%3Dd%26rls%3Dorg.mozilla:en-USfficial%26channel%3Dnp&sa=X&ei=EN7hUMDzEOqY2wXU04D ABg&ved=0CFYQ7gEwAw

Click repair manual for what your looking for.