[Dmitry at Pelican Parts]

Hello Jenine and welcome to the forum! I recommend picking up a workshop manual - all wiring diagrams and procedures can be found in the Bentley service manual for your car; I'm attaching a link below if you're interested. You may be able to find a picture online as well.

Bentley Service Manual, BMW 3 Series (E90, E91, E92, E93) 2006-2011, Hardcover - PelicanParts.com