Originally Posted by dcorn
I believe the water pressure from the pump to the windshield sprayers is what opens up the headlight washers. Then when they are open all the way, they'll spray the headlights.
If you don't use your rear window sprayer, just hook the hose from the rear window pump to the line for the headlight sprayers.
Trust me, if you have that much need for headlight washers, you'll have way more of a need for the rear washer. The vacuum formed behind the rear hatch will literally pile mud up the back window in that grimy spring weather.