Using a wrench to rotate the sunroof opening motor shaft
Due to the complexity of the hatch and its drive mechanism, it is necessary to have a lot of experience in order to repair, replace or adjust the elements of the hatch. Also, before removing the hatch, it is necessary to remove the ceiling, which is quite difficult and time-consuming. Therefore, it is advisable to repair the hatch at a service station.
If the sunroof motor does not work, first check the condition of the fuse in the electrical circuit. The sunroof can be opened and closed manually by using a wrench to rotate the motor shaft. To access the motor, remove the cover from the trim panel on the left side of the luggage compartment.
(Material borrowed from an online resource: MercedesMAN)