Do you still get the humming sound when you turn on the fog lamps? Try turning down or up the gauge cluster brightness.

I have an 03 and installed foglights and I think I had the humming when I turned up the cluster illumination. I think I rewired the switch to take care of it. That humming is probably the relay not getting the right voltage.

My hydroponics experiment

You ever notice how hard it is to lip read cartoon characters?
"Crazy is what the sane call Delta Flyer"