Heated Washer System Power and Grounds

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

High current battery voltage is supplied to the windshield washer solvent heater assembly from the 60A WSW HTD Fuse located in the underhood fuse block. The washer solvent heater uses this voltage to power the 3 heater coils. Battery positive voltage from the 10A HTD/COOL/IGN3 Fuse located in the rear fuse block is applied to the windshield washer solvent heater assembly with the ignition in the ON position. This voltage is used to power up the logic in the heater assembly. The washer solvent heater assembly is supplied with 2 separate ground circuits from G304. One circuit is used to supply ground to the logic side of the heater assembly and the second one is used as a ground for the 3 heater coils. Ground is supplied to the heated washer fluid switch from G300. Refer to Wiper/Washer Schematics .