How to unlock the radio
 

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

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.