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Most likely one of the pin switches that senses the location of the top for safety goes bad. Usually very cheap to replace. You can unplug them and jumper the wires to bypass to test to see if one are all have gone bad then replace as needed. One is in the trunk on the passenger side. Also remove any debris or personal items from the truck as it may see items in the way and cause a not ready to close top condition.
The micro switches for the hard top latches are bad and not sending a closed signal to the control module. When they stop working the control module doesn't know the top is closed so it doesn't raise the windows. Those micro switches are known to go bad. I have changed quite a few of them before.
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?
If the top is half way down that means that the trunk is open and should be touching the trunk switch to continue the process. The switch must be bad and it is inside the rear right fender close the the stop light
First check that you have oil on the hydraulic pump that it is inside the trunk on the rear right fender the oil should be between the marks. If thats ok check when you put the ignition on if the switch that operates the roof is on, should be off, on means that something is wrong, if blinks 6 times one of the 5 or 7 switchs are not closed, check one by one. check the two that close the trunk at the middle, the cover, the trunk limit switch, the trunk switch
Sounds like maybe some pin switches for interlocks have gone bad. Open your trunk and look for the rubber booted switches and try holding them or shorting them, if you make the top move it shows you which ones are bad.
This symptom almost always points to a mechanical issue, not an
electrical one. The SLK hardtop is notorious for needing to be
lubricated every couple of years. Here is a link with directions and
joints are the most common culprit to intermittent raising and lowering
problems. Once those have been lubricated and that has been checked off
the list, then consider looking into electrical issues.
The moisture from the rain may be helping to lubricate these joints and that might be why it works fine in the rain...