Hello and welcome to JA,
Go to this website from MB USA www.wireless4mb.com and every question you have they have the answer. My thing is do you have that blue tooth adapter put in your phone cradle ? Because I think you don't have that part otherwise it would pick it up in the phone system of the car. No worries it took my 3 days before I had my wife's I phone to work in a 2001 S500 but it works but it did cost me 400 USd. In your case I think only about 200 USd.
What you need to buy is that MHI Blue tooth Interface , place it in the Motorola cradle ( It will click in it ) and then pair your phone like you did earlier. You don't have to go to see a dealer you can do it easy yourself. Good luck