See the related link to find out how it should work if you have a euro car. In the US they usually (but not always) had a supplementary lock in which case this wouldn't work.
The fuel tank lock is tied into the vacuum door lock system. When the doors are unlocked then so should the trunk and gas cap. The door lock can be released from inside the trunk.
There is not a way to unlock a 2010 C200 Mercedes trunk without the key unless the back seat is taken out. You can call a locksmith or your triple A service.
Gas cap door lock is tied into the vehicle vacuum lock system. If the car doors are unlocked than so should the trunk and gas cap door. Gas cap actuator can be accessed from the trunk.
Turn the key in the trunk - it unlocks the gas door too. The locks work on a vacuum system. (You can disconnect the gas door from the system by pulling apart a plug in the trunk on the right side behind the plastic cover but I'm not sure if this would cause other problems.)
I have a 1987 Mercedes that has no trunk key. Do I remove the back seat to get in?
The fuel-filler door is part of the vacuum power-lock system. You must unlock the diver or passenger side door. The fuel-filler door and the trunk will unlock at the same time.
Surely a Mercedes has a remote trunk release? If not, have you tried removing the rear seat back and entering the trunk from there. If all else fails time to call a locksmith..... Surely he'd check for a trunk release before posting... you gotta get in thru the speakers, not much room rico
In the trunk
All Mercedes have battery in the trunk
Just push and hold the right button on the key.
with the button on the drivers door? How do you get in the car without keys though?
How do you replace trunk lid springs on a 107 body 1983 mercedes 380sl?