Installing Navi from another 508 in mine

Greetings,


i would like to ask if someone got information about whats necessary when installing a original Navi from another 508 (2011) MM-BTEL,CD-6356(Artnr.9678276480)


Is there any "coding" necessary or something ?

Does the "new" Navi need to be coded to the car ?

The problem is, everything is working just fine, only no sound is coming out the speakers - either in Radio mode or anything else.



Thank you for your help, and sorry for the bad english...