Hummer 2008 H2 - 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.
{ 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.
Z
(Rear Wiper): Press this side of the button to
turn the rear wiper on and off. The wiper speed
cannot be changed.
Y
(Wash): 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.
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