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Remove the drive motor module and close the sun roof, then reinstall the drive motor module.

if the key won"t turn at all ,take it out and put engine oil on it or get some graphic spray and spray into key tumbler ,

replace the siren module. when that goes bad it can cause communication problems between the sunroof and the uem which is the rear view mirror assembly that the sunroof switch is on

roof has manual crank.open small cover on roof linning just in front of centre of sun roof and crank closed with 3 allen key usually kept inside fuse box cover.

Not familiar with the Volvo, but many cars (Toyota, Lexus, Acura, Honda, etc.) have drain holes at the corners of the sun roof assembly. These holes allow water that gets past the sunroof gasket to drain through tubes that carry the water to the bottom of the car, where it exits the car.

These drain holes are prone to clogging. If the Volvo setup is like those cars mentioned, you can see the front drain holes by opening the sunroof and looking closely at the two front corners of the assembly that holds the sunroof. I have used plastic weedeater line to open up these lines. Compressed air can also be used.

check your fuse in position 38 in the fuse box....this fuse is for the car's alarm system but also seems to work the sunroof, I have a problem with this fuse when its not blown the sunroof opens with no problems but when it blows the roof will not open I am not sure how they are tied in together but they are....so I would say that you have an electrical issue....do not replace the motor until you check this first

THERE SHOULD BE A PLUG IN THE COVER FOR THE SUNROOF MOTOR THAT YOU CAN POP OUT & CLOSE MANUALLY WITH A SCREWDRIVER

try disconnecting the battery again and leave for about an hour before reconnecting

I tried to change my main headlamps both were working fine the i changede 1 it worked went to change second one and now nither work home muy 2001 volvo s80

there is a manual way to close it. between the rearview mirror and the sunroof there is a plastic box remove the two screws holding this on and remove. then with a flat tip screwdriver depress the white plastic clutchpinin the center of the motor screw.(this should be towards the rear of the area).turn this white plastic pin to open or close your sun roof. i hope this helps.