2007 GMC Acadia Owner's Manual - Page 179

Rear Window Wiper/Washer To turn the rear wiper on, slide the lever to a wiper position. {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. The rear wiper control is located on the turn signal/multifunction lever. 9(Off): Slide the lever to this setting to turn the wiper off. 5 (Rear Wiper Delay): Slide the lever to this setting to turn on the rear wiper delay. Z (Rear Wiper): Slide the lever to this setting to turn on the rear wiper. = (Rear Wiper Wash): Push the button on the end of the turn signal/multifunction lever to spray washer fluid on the rear window. The wipers will clear the rear window and either stop or return to your preset speed. For more washer cycles, press and hold the button. 179