GMC 2002 Envoy - Manual (Page 111)

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Rear Window Washer/Wiper
This control is located to the
right of the steering wheel
on the instrument panel.
To turn the rear wiper on, turn the control to either 1, 2,
or 3. For delayed wiping, turn the control to 1 or 2.
For steady wiping, turn the control to 3. To turn the
wiper off, turn the control to 0.
To wash the rear window, press the washer symbol
located in the center of the control.
The rear window washer uses the same fluid bottle as
the windshield washer. However, the rear window
washer will run out of fluid before the windshield
washer. If you can wash your windshield but not your
rear window, check your fluid level.
Headlamp Washer (If Equipped)
Your vehicle may be
equipped with a headlamp
washer system. The button
to operate this feature is
located on the instrument
panel and functions
separately from your other
washer systems.
To wash your headlamps press the headlamp washer
button briefly and release to activate the system. Two
pressurized bursts of washer fluid will then be applied to
the headlamps.