Circuit/System Description
WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
The heated windshield washer fluid operation is controlled by a separate switch located on the turn signal/multifunction switch. When the heated washer fluid switch is pressed, ground is momentarily applied through the switch contacts and the heated washer fluid switch signal circuit to the windshield washer solvent heater assembly. In response to this signal, the washer solvent heater assembly then applies battery voltage to its internal washer fluid heating elements and pulls the heated washer fluid indicator control circuit low commanding the DIC to display the HEATING WASH FLUID WASH WIPES PENDING message. The washer fluid is then heated as it passes through the heater assembly to the windshield.