2007 Chevrolet Tahoe Owner's Manual - Page 209

The rainsensor will automatically control the frequency of the wipes from the off setting to the high speed setting according to the weather conditions. The wipers can be left in a rainsense mode even when it is not raining. When Rainsense™ is active, the headlamps will turn on automatically if the exterior lamp control is in the AUTO position. Notice: Going through an automatic car wash with the wipers on can damage them. Turn the wipers off when going through an automatic car wash. Windshield Washer {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. L (Washer Fluid): There is a paddle marked with the windshield washer symbol at the top of the multifunction lever. To spray washer fluid on the windshield, push the paddle. The wipers will clear the window and then either stop or return to your preset speed. Heated Windshield Washer If your vehicle has the heated windshield washer fluid system it may be used to help clear ice, snow, tree sap, or bugs from your windshield. 209