I believe the black thing is the ABS accumulator that makes the buzzing noise.
There are rumors from tighting a few bolts to replacing an O ring to fix it.

*Infamous problem with Accords and the Honda Odyssey*

I have the same problem and its quite annoying with the whole buzzing every few minutes.
To replace this whole unit its over $1000 dollars.

Apparently there is a leak somewhere and the unit loses pressure.
What you hear is the unit trying to build back the pressure and it cant.
Which in turn burns the unit out eventually.

Im tempted to pull the fuse so it goes away.
Im not sure if I have ABS, as my light never comes on.
Only when I turn the key the first time it lights up so I know that works.
Anyway good luck fixing it if you choose to do so.