DK,
Both my high and low beam headlights went out a few weeks ago which sent me into a little bit of a panic attack (since it was dusk and quickly getting dark). After switching out the big fuse/relay under the hood with the horn relay (to see if that was the problem), I found a couple of 10A fuses at the back of the fuse box (closer to the winshield) that where both blown. I replaced them and things have been honkey dory ever since.
Hope that helps.
Mark
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless