Dash board lights on 2003 Toyota Highlander

Out of the blue, my dashboard lights have gone haywire! When I turn on the headlights, the dashboard lights (including radio dial, clock) turn off. I checked the fuses, and they all seem fine. What could cause this mystery?

Asked by for the 2003 Toyota Highlander
1 answer
Make sure your dimmer switch isn't turned down? My wife does this all the time.