i belong to a mercedes shop forum that offer support for technical issues to mercedes shops around the world, there was a similar post there with similar issues see fix post below

---------------------Car was repaired correctly-------------------------
Thanks for the replies - several suggested that the sunroof needed to be synchronized - I attempted that - process is to hold sunroof switch in the tilt up position for 5-10 seconds -This did not initally work and correct the problem. After speaking with tech support - they indicated that this is a Hall effect car - meaning that sunroof position is learned and then determined by watching the Hall sensor - the overhead control panel must "unlearn" the pre-existant information before it will take a synchronization. SDS can do this but if you lack an SDS you can just unplug all the wires to the dome lamp assembly OCP and then reconnect them. This causes the system to loose memory. After I reconnected the panel - the system would synchronize and works perfectly. Thank you for all for the help. seems that disconnecting the battery would do it also.