I believe that there is a retro for this and many have done it,,someone better than me should come on and advise,,I think it is a plug and play and possible STAR turn on, your electrics are basically C class
Sorry to say that this is more complicated than first thought,,many did it on the earlier C class and your car was based on this. I do not think that it will be cost effective
I upgraded mine on a W209 CLK. It was plug and play. Big issue is removing the old unit which can be quite tricky. Fortunately my CLK only required a few screws - not the locating hidden retainers in air vents. Cost of the replacement unit was €220 from BenzNL. In hindsight not worth the expenditure but I enjoyed the project.
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