Date registered: Oct 2004
Vehicle: 2013 S550
Location: Tampa, Florida
Mentioned: 37 Post(s)
Quoted: 447 Post(s)
Edward Chung, it depends on what car you are installing the equipment in. Both questions are answered if you will just pay attention to the How-To Guide for Bluetooth, etc. in the stickies.
While you posted in a thread related to an '03 W220, the only car you show as owning is a '93 W140. If that is not the case, please update your profile via the USER CP in the gray band at the top of the page.
First, the 1993 W140 is not covered by the How-To Guide for Bluetooth sticky at all. The years covered are listed in the first paragraph of the first post. I have no knowledge of being able to place a linear compensator and a PSE from entirely different models (all of which use fiber optic audio systems, something I'm not sure a '93 does) into that car and make it work.
In North America, the cars that can accept the hands-free systems are usually pre-wired and would have the proper connectors (the only exception was the '06 W220, for which pre-wiring was an option, whereas it was standard on all other model years from '00 on). I would refer you to the phone bulletin for your car for the wiring and fiber optic connectors; but be aware, there isn't one for the '93. The phone bulletins are accessible in the attachments in the How-To Guide for Cell Phones in the stickies - the blue backgrounded area toward the top of the first forum page.
For the '00 through '04, a voice control unit was not required. For the MHI phone systems, '05 and later, it was.
If you aren't installing the equipment in a '93, then tell us what you're installing it in! Perhaps then we can give you a better answer. If you're installing in an '03 W220, this answer should give you what you need.
2005 S500 4-Matic
Last edited by Skylaw; 05-26-2019 at 06:01 AM.