Is the subwoofer at fault? Has anyone ever thought about it....
 

I am wondering if the bass from the subwoofer is at fault for the "check brake light" message that comes up because of a faulty circuit board for the taillights?

Mine has the issue and its only on the side where the subwoofer is.

Nope.

Both sides on mine have had the problem and the circuits aren't at all interconnected (well, at the battery they are…).