GM Service Manual Online
For 1990-2009 cars only
(Washer Fluid): This feature is located on the paddle marked with at the top of the multifunction lever. Push the paddle to spray washer fluid on the windshield. The wipers will clear the window and then either stop or return to the preset speed.

Caution: In freezing weather, do not use your washer until the windshield is warmed. Otherwise the washer fluid can form ice on the windshield, blocking your vision.