Sounds like a relay or something, but I don't know if there is one in that area. It could possibly be a wire near the ignition switch making intermittent contact. Maybe it is coming loose or something. I expect someone could look at it real quick and probably fix it. Alternatively it could be the sound is actually coming from behind the instrument panel or even near the shifter and you are just mishearing where it is coming from.
Here is a link to the page that shows the ignition switch area.
http://www.hondaautomotiveparts.com/...INATION+SWITCH