Unlock boot without key

Behind number plate drill with hole saw to the left of key catch above, reach in with pliers to move rod to unlock

you should be able to use the mechanical key that is located on the side of your remote key fob. It slide out.
Then insert it into the lock under the rear lip of the truck near the release handle.
Hope this helps

Mercedes are very secure cars and the downside is that you really need the keys. Very awkward that the loss has happened so close to Christmas but if you can be patient it will be best to wait until you receive the keys from Germany.

open it from inside by dropping the back seat if possible

your can check is it something stuck in the lock, first operate your roof either way, if you are going to open the roof as a first action boot lid will open to backward, let boot lid fully open and stop operating the roof, ignition off and have a look if something stuck you can see, if you are going to close the roof let close the roof and before close the boot lid stop operating roof switch, otherwise faulty boot lid lock, if faulty lock but you can try by mettle key blade which is in your electronic key, first take out mettle key from electronic key then insert mettle key in to the key hole in boot lid turn fully left and open boot if not work turn fully left and push it in, is this information helped you?

Hi spray the lock and the mechanism with WD40 dont be shy with it, ensure you spray the underside of the boot lid where it meets the lock, the electric motor may be struggling to open without the key, spray everything and repeatedly lock and unlock with both the key and the remote after a while it should free off, if the lock is stiff then the motor will not be able to force the latch over and open the boot.

It is very common on mercs, like I say dont be shy with the wd40 it normally fix's this fault.

Regards
Dan

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I have the same issue (battery is completely dead in my 1998 Mercedes C280 and I can't pop open the trunk). I looked under the hood and have no idea where the positive charging post would be - can anyone help me find it? Thanks

Hi, I had similar problems, try this...
Put the key in the ignition push the lock button on your keyfob, pull the key out while holding down the lock button and press the unlock button 5 times. Your key should now be reset and ready for use.

Solved my problem.

I had same problem with my 2002 CLK430. Dead battery with car locked. You can't open doors with the mechanical key (inside remote key), as windows need power to slide down slightly to allow clearance, so you can't access the hood release. The answer is to insert the mechanical key in the key hole for the trunk (boot). It will only go in one way, with the slightly larger grip part down. I found it easiest to turn with a pair of flat nosed pliers. Turn counterclockwise to the left to to the 11 o'clock position. Then push the release in and the trunk will open. Battery is located in the right rear quarter under the flooring panel that also covers spare tire. Hook up charger or jumper cables and power will come back on, as will alarm. To disable, just push the unlock button on the remote key. You should be good to go from here!