My 2010 C220 has a little lever protruding out from below the dipped headlight reflector.
Get a mirror and flash light and from behind, remove the cover as if you were changing the bulb and check to see if you have one sticking out.
If you have, you must move it sideways to the other end of the slot. Note that left and right lights go in different directions, and it hurts your finger tips LIKE HELL.
Tip, cut a finger off the wife's gardening gloves, and use it as finger protection.
Tony