I've been riding around with a "dipped headlight bulb out" error for a while, so today I tried putting in a new bulb. It took me a few minutes and a flashlight to figure out how to physically make the switch, but the unit still doesn't work. Is there some other possibility I should look for - like a fuse dedicated to one headlight bank only, or something - or do I need to recheck my connections even more carefully? Thanks, p. '01 s60