GM Service Manual Online
For 1990-2009 cars only
(Windshield Washer): Press the windshield washer 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.