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Has to go on a scanner to see what isn't working. The control module could be receiving the signal. This could be the controller or a bad wire. No communications between computers. Even doors have computers in them.
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
On the side of the smart key there is a mechanical key that slides out of one of the sides-There should be a little release lever retaining the mechanical key. It can be inserted into the trunk lock and turned to open the trunk. There are several other positions the key can be turned to place the trunk lock actuation in different modes- it should be in your owner's manual Hopefully I have been helpful
this is nothing to do with rear door not opening,the lock is stuck because no body has ever oiled the mechanism with a good old fashioned oil can,best thing ever invented the oil can,forget the silly fish oil sprays