Low Washer Fluid Warning Indication (Base Cluster Only)
WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
The instrument cluster is hardwired to the low washer fluid switch. The low washer fluid switch closes and provides a ground to the instrument cluster when the washer fluid is low, turning on the low washer fluid indicator. When the washer fluid is above the low level, the low washer fluid switch opens and removes the ground to the instrument cluster and the low washer fluid indicator turns off.