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You may be able to unlock the trunk from the door lock pump under the back seat. Remove the rear seat bottom and the insulation from the right side. You'll see the battery and a foam box. The door lock pump (PSE) is in the foam box. You need to remove the vacuum line for the trunk latch (labeled RTR or RHR on the PSE pump) and apply some air pressure to it to unlock the trunk. You should then be able to open the trunk normally, unless the trunk lock key tumbler is in the lock position, then you need a key to get in.
Many People don't know exactly how to use the manual key attached to your remote to open the doors and trunk in case the battery is dead. All you have to do is slide the locking button in the back of your remote and pull the metal pre-cut key, then insert it in the trunk lock, turn key to the left and then push in. kawaboongha!!!
Make sure you have good batteries in your key fob. Also, there is a trunk, lock, and unlock relay. If anyone of those are bad you can have this problem.
you have to stick the key in the trunk and turn it to the lefy while hittin the unlock button on the key pad 35 times has to be 35 and it will unlock. my battery died and it locked the trunk as u know i coudn't jump it cause the battary is in the trunk haha but yeah 35 times while hitting the key. mercedes wont tell u but my buddy works for inskip and filled me in your o so welcome from one s430 owner to another
Can you open and lock your doors?
If yes, then it could be the boot catch.
Try a good mercedes scrapy for the second hand boot lock unit. Dronsfield mercedes are good, 01457871717
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