2008 Hummer H2 Owner's Manual - Page 161

Rear Window Wiper/Washer If your vehicle has a rear window washer/wiper, the button is located on the instrument panel to the left of the instrument panel cluster. Y (Wash): {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. Press this button to spray washer fluid on the rear window. Release the button when enough fluid has been sprayed on the window. The rear wiper will run a few more cycles after it is released. If the rear wiper function was already on, prior to pressing the wash button, it will stay on until the wiper button is pressed again. 5 (Delay): Press this side of the button to turn on delayed wiping. The rear window washer uses the same fluid that is in the windshield washer reservoir. See Windshield Washer Fluid on page 5-35. Z (Rear Wiper): Press this side of the button to turn the rear wiper on and off. The wiper speed cannot be changed. 3-11