Hi,
I have an Audio 10 radio in my 2000 E320CDI. I need to unlock it, and have the correct code. But I'm not sure what button to press after entering it, after pressing the last digit the first starts flashing again. I've tried pressing (and holding) all the other buttons I think. It has the volume knob one end, and the radio numbers and a central round one in between these.
Thanks
Harry

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1975 W115 240D Mercedes-Benz
1950 SI Land Rover
1963 SIIA SWB Land Rover
1945 C15A Chevrolet CMP
1981 HJ47 Toyota Landcruiser

If it's the same as my '95 C car, after the first digit starts flashing again, you push scan, seek or tune to confirm the code.

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1983 380SL
1995 C280
1995 S500 coupe
1990 Mazda Miata
2004 Suzuki Hayabusa