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If the "black part" you are talking about is the "trunk partition"(which should come up as a "fault" on the dash when you try and cycle the top) then there are several things to check. The partition itself should snap into the retracted position(forward), and back. If it doesn't there are two struts(also called air springs) that have lost their charge and are not holding the partition in place. It has to be held solidly in place to set the switch on the left side(driver side) in order for the top to go down. If it's at all floppy, it won't set that switch and the top won't cycle. I've found the hard way this is a common problem.
this may be a broken track or if it doesnt move at all then it may be the motor or the switch is bad, try pushing the switch hard and hold while you wiggle the switch, i would check the fuses to make sure there are no bad fuses.
is your soft top not working it's not the faulty relay, it's control by electronic control unit, it's call soft top control unit, so first do one thing, open boot and have a look, there are one separation lid which is winding like cover, you must have close your boot separation lid buy pulling it out and hang it on hook which is locate both side back in boot, there are two hooks for hookup the separation roller lid,you pull it out and hookup it on two hooks, and close boot then operate roof if still roof not working it's need to be diagnose because there are many sensors and switches are fitted in this system if one switch or sensor not work your roof will not longer be opening and also there are any hydraulic oil leaking or lack of oil in the pump, it will not work, so in this case you must drive your car to the authorized Mercedes workshop who have the right diagnose tool knowledge for this particular car,
The microswitch in the trunk is probably failing. Its just a pin switch. Get a new one and install. Its meant to warn you if there is something in the way.
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