Vannoo

Hi folks Just stumbled across this club while trying to solve a problem with the headlights in my 2000 Avalon Conquest My left low beam no longer comes on. (the right one is fine) I saw it fail as I turned on my lights yesterday. It comes on when I turn on my high beams, so its not the actual bulb. I've checked every fuse that I can see. I'm guessing there's a fuse I don't know about or perhaps a relay. Hope someone here can help. Thanks in advance.