Date registered: Oct 2004
Vehicle: 2013 S550
Location: Tampa, Florida
Mentioned: 37 Post(s)
Quoted: 447 Post(s)
Both of my W221s (including a '10) have had it, Ralph, as did my W220s. One trick is that the mirror position for reverse must be set while the car is in reverse gear; the other, which you probably already know, is that after setting the mirror position, the mirror select button must be left in the passenger side mirror position for the feature to work.
No doubt you have your owner manual, and having followed your posts for years I know you have read it - but the steps can be complicated, so here is a page from my '10 manual.
2005 S500 4-Matic
Last edited by Skylaw; 06-01-2019 at 04:23 PM.