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Skyman: We had the same issue with Alpine Audio and Video system that is installed in our EV2. We have the steering wheel controls for radio, CD, DVD etc... but no display at all on EV2 screen... The installer who did this is very very good but he had to acknowledge that Alpine only manufacture this kind of adaptors for Opel, Daimler-Benz, BMW and maybe Porsche, that's it. He knows of some Espace that he was able to "tweak" but no more. All Alpine seems to look for is how much kit they can fir in a Merc so that they can inflate their prices.
By the way, Keep the RT3 and change the Speakers and you will REALLY see the difference. You can even add an Alpine amp in between if you have the space under one seat...
The Radio does not seem to eb the issue. The speakers were a complete change in terms of power and clarity !
Good luck.
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