Headlamp Washer System Operation
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
The headlamp washer pump is controlled by the headlamp washer pump relay. The headlamp washer pump relay requires voltage from the front parklamp voltage supply circuit and the windshield washer pump control circuit to energize. Battery positive voltage is supplied to the switched side of the relay and is used to power the headlamp washer pump when the relay is energized.