My car has a buzzing sound coming from what appears to be somewhere around the drivers side b pillar right next to my left ear. I can't seem to find the exact spot but I think it may be the seat belt mechanism. Has anyone else experienced this?

 

it might be the side air bag or even the speaker
put your hand it when it buzzes and see if it stops

 

I had an annoying buzz which I could not locate for a long time. It only presented itself in cold weather. 2 weeks ago I found that it was the dome light lens. I plan on resolving myself by a bit of black felt.
Try jaming your fingernail between the dome light lens and the housing and see if it disappears.
Good luck, interior BSR [buzz, squeak, rattle] can be a BITCH [bitch] to pinpoint.

 

I had a buzz at about 70mph.

Dealer filled the B pillar with foam. Buzz gone.