Quote Originally Posted by SergioSe View Post
Somebody knows the difference between the Audio 20 CD and Audio 20 CD Touchpad version?

Is it possible to use the audio 20 CD Touchpad on cars without touchpad?

@piotrscs Is your version Audio 20 Cd, isn't it? According to the manual on the root directory of your copy, It seems the Audio 20 Cd version.

The base Audio System is called Audio 20 USB.
There is an enhanced Version available called Audio 20 with Touchpad ( Mercedes Dealer code 522 ).
As the name suggest this unit has the touchpad functionality AND also some more wiring to connect the GPS antenna

To be able to use the Garmin Navigation functionality you need:

Garmin Map Pilot preparation ( Mercedes Dealer code 355 )
which depends on Audio 20 with Touchpad ( Mercedes Dealer code 522 ).

And of course

The Garmin Map Pilot package ( Mercedes Dealer code 357 ),
which in essence is the SD with the maps and the software functionality requires both.

According to my MB Dealer Code 355 can be retrofitted if Code 522 is installed.

Code 355 is the GPS Antenna and wiring which can only be connected to a Audio 20 with Touchpad unit (522).

To safe some $$$ when ordering you should by package 355 and 522 and get an unused SD Card from Ebay.

The owners manual on the SD card is specific to the Garmin functions which have the dependencies I mentioned above.