Hi, The roof system is quite complex & has its own diagnostic system that needs checking with a diagnostic tool such as Mercedes STAR to test for fault codes & functionality checks.
In the first instance however you should check the partition cover in the boot to ensure it is fully engaged to its extended position
A common problem on this vehicle is the hydraulic rams that hold the partition cover go weak & do not hold it against the switch
This causes the roof not to function at all
It is , but there is no display on dash as if it is tyring to work.
although it may seem fully extended please ensure it is engaging the switch at the end of its travel
if the roof partition separtion panel is not engaged fully then the roof will just not work
Failing that then the system will need checking on STAR diagnostic tool
there are too many possibilities to guess without having the system checked correctly
It is engaged, when it's not , it displays fault on dash, but it is'nt showing anything , even that the roof is trying ?.
ok - unfortunately the system does need a diagnostic tool to see what is happening - it could even be the roof switch is faulty & the roof control module is not getting a signal which would be checked using the diagnostic tool to see what signal is being received
no problem at all