sunroof problem

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I have a 51 plate xtrail and I have just started experiencing problems with sunroof. it opens itself automatically when I start the car and will not close again. I have to close it manually but it will not stay closed while I am using the car.
I have disconnected open and close switch but still it does the same thing but I can hear a clicking but don't know where else to disconnect from..
does anyone know how to disconnect motor and its location....
I would appreciate any help anyone can give....thanks