No recoding necessary for the dimming mirror.

Here's the article from the home page that I followed a few years ago when I replaced mine => http://www.xoutpost.com/articles/x5/...tion-tips.html

Here's what it looks like => http://www.xoutpost.com/bmw-sav-foru...ss-mirror.html

Just be careful when you twist the mirror back on...some have reported cracking of the windshield during this process.