Thanks for the tip.. That's an interesting idea. It does sound like the fader is shifted all the way to the front with the icruze connected. Still doesn't make sense that the fader is functional in one config and disabled in the other.

Oh well, I'm ready to give up anyway. I've gone through 3 MB head units I can't make any of them do exactly what I want. I think I'll put all 3 on ebay and go for an Alpine with their ipod interface..

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'89 190E 2.6 5spd
'99 E320 Wagon