Sometimes when I close my door I can hear this buzzing noise for 2-3 seconds. During that 2-3 seconds it fades out. Any ideas?

 

The noise sounds more like a quiet but muffled sound of the horn and during the 2-3 seconds it fades out until you cannot hear it anymore.

 

check inside the door? :dunno:

 

Very strange...could be any kind of motor or something, or maybe an electrical circuit arcing?? I guess that would pop a fuse...

Maybe somthing is loose, like a peice of plastic inside your car or door that is vibrating when you shut the door, try shuting it really easy and see what happens...