While post #11 at little but history and background, it may help some to understand the rather complicated posts below just a bit better. Most of the critical information needed is in the first seven posts in this thread.

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The only thing you need to add is a compatible phone (unless a prior owner has removed the puck).

You can see the link for covered models and compatible phones at Mercedes-Benz Bluetooth Connectivity (thanks for pointing that out, lkchris ).

In addition, thanks to member Eric (eric32955), if you have trouble with the pdf file links, we have the procedure for getting them that was used by Ex-Fed, which can be used as a backup or alternate source: 1) Go to the Wayback machine site, https://archive.org/web/2) Enter the complete URL of the file formerly available on Paul's site (example - archive for the 2005 E-series sedan) from Paul's page such as " Sedan.pdf".

Paul's index page is still up so this can be used as the source for the URL information you'll need.

See the audio systems primer at on Newer Cars: Much of this thread has been directed toward pre-2010 models,.

The MHI system continued to be used in different North American models through 2009, though beginning with the '08 C-Class, and continuing with the '09 CLS, SL, SLK, and S-Classes, Bluetooth was standard equipment and did not have to be ordered separately.

--Last, if you have a MOST Bus equipped car with an MHI phone system, posts 1, 5, and 9 apply.

NOTE: The phone bulletin for your car will make reference to the type of fiber optics you have, but if you need confirmation see post #2 at or at page 16, lost on Paul H.

Click on a highlighted date (in this case, I used Sept 2, 2011). There's your PDF Phone Bulletin, complete with pictures.

Shortcut Link for MY '00-'03 Voice Control Manual: https://web.archive.org/web/20060205... Note that MY '00 VCM controlled only phone functions, and was operated by a button on the steering wheel; MY '01-'03 VCM operated many more items, and was operated by a stalk on the steering column.

My installation experience is limited to my own S-Class cars, so I have not seen all of the wiring and connectors in each model - for that I rely on Paul H. The bulletins on Paul's site end with MY '05, and I do not have access to later information; however, some models (such as the '06 S-Class) used identical installations to the MY '05, and the '05 bulletin can be used. It does NOT mean that the electronics such as the PSE and cradle, or any other components are present.