Washer Fluid Level Warning Switch
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect washer fluid level warning switch 2-pin connector. Check for continuity between washer fluid level warning switch connector terminals. With washer fluid level warning switch off (float up), no continuity should exist. With washer fluid level warning switch on (float down), continuity should exist. If continuity is not as specified, replace washer fluid level warning switch.