Need help with lighte doo sills installed on my 2011 Mercedes Benz E350 4matic (W212)
 

I recently bought lighted doors sills for my 2011 W212. I plan on tapped into the lower door lights in the lower bottom of the door pad and going through the boot on the front 2 doors but, the back doors are a challenge because there's no hollow boot in the rear doors that I can go through. Does anyone have the wire diagram or can tell me the color of the wires in the B post that I can tap into to get my rear lighted door seals working when someone opens up the rear door.

Please let me know. Thanks everything for your time.