It does that automatically mate when you pull the lever, unless your water level is running low then it will only squirt the windows....
Hang on a minute, I thought it only did the lights as well when you actually had the lights on?
Yeah, mine automatically squirts the lights only when the lights are on. What is the use of the switch down below then? To disable the light washers? Or does the switch let you wash the lights when you don't have your headlights on? Excuse me, I really haven't a clue what I'm talking about now.......