There are different voice recognition modules for different languages, so I think they are not changeable... (well, the german and swiss/german one seem to be the same) but all others are different.
Assuming (and I havent checked the wiring diagrams) it is similar to the rest of the range, you need to move the microphone wires from the normal phone controller to the linguatronic controller, and power and wakeup (piggy back from phone system if retrofitting) and insert it in the fibre loop before the phone controller.
- That is why there are 2 variants of phone wiring harnesses - one with linguatronic and one without.
Theres a thread on mbguru about W211 (or was it W220) retrofit where i suggest buying a W203 linguatronic harness and using that as a base for your retrofit. It has the part nr of the harness you could use.
Richard
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