2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 230

Windshield Wipers 6 (Adjustable Interval Wipes): Turn the band up for more frequent wipes or down for less frequent wipes. 6 (Low Speed): Slow wipes. ? (High Speed): Fast wipes. Clear ice and snow from the wiper blades before using them. If frozen to the windshield, carefully loosen or thaw them. Damaged wiper blades should be replaced. See Windshield Wiper Blade Replacement on page 6‑69. Heavy snow or ice can overload the wiper motor. A circuit breaker will stop the motor until it cools down. Turn the band with the wiper symbol to control the windshield wipers. 8 (Mist): 9 (Off): Single wipe, turn to 8, then release. Several wipes, hold the band on 8 longer. Turns the windshield wipers off. 4-6