I just bought the car. I'm not sure even what button to push since I pretty sure its dead. The black toggle on the end of the center console is probably it; but since its broken, I don't know for sure. If I had a wiring diagram, I would jumper it.
The A/C is dead, so I hope I can get this thing to work soon. Its hot!!

You may try and manually open the sunroof. To do this, flip down the cover on the left inside of the trunk. Insert the socket wrentch (from the MB toolkit - if available) through the access hole in the panel and place it on the hex-drive of the electric motor. Turn the socket wrench carefully. To open the roof - turn counterclockwise; to close the roof - turn clockwise. I don't think your model has the roof that raises so the above information should be OK.

Hope this helps.

-Stephen Davis
1988 300E 90k miles
MBCA - N. Texas Section