You can use special tools for
this, but a small pocket knife with a file blade will work equally as
well. The photos are of the bottom of
the radio, and illustrate how the blade or tool engages and pulls in the catch
at the side of the radio to release the radio.
Insert the blade at an angle as shown, and then straighten it as you
more fully insert it. Gently pull that
side of the radio out a fraction of an inch.
Then move to the other side of the radio and repeat.

Once both sides are free, you
can pull the radio completely out of the dash.
Many Mercedes radios require
the entry of a security code whenever the radio is removed or disconnected from
power. You will need it when you
reinstall your radio. It is recorded on
a card in your owner’s manual case. You
can also obtain if from your dealer by supplying your VIN and/or radio serial
number.