Ok here I’m in a Mercedes E240, obviously
an E Class from 2002 and we have just changed the battery, or had to disconnect the battery
to charge it. So the radio no longer works. When you turn on the ignition it just says
“CODE” with a flashing “C”. This is the Mercedes Audio 30 head unit with the numeric keypad
here. We’ve got the code, it’s nice and easy to enter it. This one is 1, 5, 3, 1,
6 but obviously it will be different for yours. Then you have to press one button to complete
it. Which is that one on the right, so it’s the right directional one. And that’s it.