Buzzing Noise from under front passenger seat

I have this annoying buzzing noise coming from underneath my front passenger seat. Anyone else having that problem? I'm assuming that it's the various wiring underneath the seat just vibrating together? Thanks.

 

Bump. Any suggestions? Thanks!

 

Wires don't normally buzz.

I would suspect something Under the cab such as a heat shield on the exhaust...

 

A/C squeal from under glove box?

 

Good suggestions above. One additional note... I've learned that your ears can play tricks on you when it comes to diagnosing cabin noises. I've chased many sounds that didn't end up coming from anywhere near what I initially thought was the source.

Since you mention a buzzing sound on the passenger side, I'd check behind the glove box. The link below is not my post but I followed the instructions and eliminated a buzzing sound from the passenger side of my truck:
http://guidedir.com/toyota-tacoma-buzzing-interior-noise-fix/

Hope that helps and good luck!