With the panel off you need to remove the pull cable for the handle.
W203 removing door panel.
A quick tutorial on how to remove front door panel on the c class model.
Remove this piece by unscrewing the single t20 torx head screw and pulling the trim piece straight back.
Moving to the top of the panel gently insert your trim tool and pry the door panel up and away from the door.
Is the same for mercedes c180 c200 c230 c240 c270 c320 here is.
With the screw loosened pull the lock out from the handle.
A quick tutorial on how to remove front door panel on the c class model.
First remove the plastic lock along the upper ledge.
If you use a bit and it falls off inside the door you will be removing the door panel to retrieve it.
If your door panel has never been removed it may take a little force.
Take a moment to notice the fin on the end of the lock and look inside the door to see how it lines up with the lock latch mechanism inside.
The first is the door lock trim piece.
It unscrews counter clock wise.
The door panel is only held on by three attached pieces of hardware.
There are seven clips that hold the panel to the sides and bottom of the door.
Remove the infrared sensor plug.