Circuit/System Description
WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
The body control module (BCM) controls the washer motor based on an input from the windshield washer switch, a part of the multifunction switch. The BCM monitors the washer switch through the windshield washer pump control circuit. When the WASH switch is closed, voltage is supplied to the BCM which will command the windshield washer fluid pump and the low speed wipers On.