Thank you for your reply.
I managed to find a retired bmw radio expert working part time from his home garage. He found no amp in the trunk which must mean that the tuner-amp must be some sort of a combo. His diagnosis is that the tuner is busted. The price of a new one from the dealer is just crazy, approx 3,000- USD
The next step is to find an alternative. Where to look ? I´ve been browsing the net and came accross the Alpine IVA D106r
Maybe you or other members have further ideas or comments.
One other thing. Should there be any trouble bying a unit in the US for a euro spec. BMW ?