They often seize up give the rod a bit of a twist and then close the boot.
Slk roof switch not working.
Roof will not open after dead battery.
One trick that you can try is to locate an identical relay in the fuse box keep note which system it serves and swap it with the convertible top relay.
Swap it with a known working relay that is identical.
Slow blinking red light.
If not the switch or wiring between the switch and relay could be the problem.
Relays are affordable and having a spare is a good idea.
Check the convertible top relay as well.
Replace the convertible top relay if necessary pn 0025421319.
You can also bridge the top relay for a couple of seconds to see if the hydraulic pump start to run.
When putting switch in close position answered by a verified mercedes mechanic.
If power is going to the relay but it isn t clicking either test or replace the relay pelican 002 542 74 19 m44.
Next check the micro switch where the divider locks.