Rear Washer System Operation
WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
When the rear washer switch is pressed, ground is provided to the rear washer pump through the wash switch contacts. The rear washer pump has ignition voltage applied through the WASH fuse when the ignition switch is in the ON or START positions and will operate as long as the washer switch is engaged.