GMC 2003 Safari Owner's Manual page 134

Rear Window Washerwiper
Your vehicle may have this
feature. The rear window
washedwiper is controlled
by using the switch located
on the instrument panel,
next to the audio system.
For delay wiping, slide the switch up to the center
position next to the word DELAY on the rear wiper
control. The wiper will cycle every nine seconds.
To wash the window, push in on the switch. Window
washer fluid will continue to spray until the switch
is released. The wiper will continue with three more
wipes and then return to the setting that was chosen
before the lever was pushed.
Move the switch to OFF to turn off the rear window
washer.
The rear window washer uses the same fluid bottle as
the front windshield washer. If the fluid level is low in the
washer bottle, you may not be able to wash your rear
window. If you can wash your windshield, but not
your rear window, check the fluid level.
To turn the wiper on, slide the switch all the way
up to ON.
3-9