I have something similar. I have a silver 2001 LE. 20k miles. Bought it used about a year ago. It has a mid frequency hum that occurs on the highway, usually several hours into a trip. Doesn't happen very often. I can't tell where it is coming from yet. It is not consistant with speed, weather or road conditions. Just starts up out of the blue for maybe 10 minutes or so, then goes away. When it occurs, it is a steady hum. If I tap the brakes, it stops but just for a second and then comes back. I can sometimes changes lanes and it stops while I am in that lane. (I think it has something to do with the camber in the road.) Happens very infrequently (but really bugs my wife when it does.) Have never been able to reproduce the problem for the dealer. The dealer did replace a caliber but that did not fix the problem.
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