why does my 2005 sc430 buzz from dash board

Have you taken your seats out at any time, I have the 02 version and once I removed the seats plugged them back in I got a continuous buzz as well, how I fixed the problem was your drive side fuse box near gas peddles might need a new fuse, or take another off with the same value and see if it turns off i wish i could give you exact location of the fuse but it solved my problem

There is a button under the steering wheel in a 06 Lexus SC430. Press it, buzzing gone