GMC 1994 Yukon Owner's Manual page 92

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Electric Tailgate Glass Release
Before operating your electric tailgate glass release, see the caution under
"Tailgate Glass, Tailgate and Rear Doors" in this section.
The electric hatch
release button, located
below the headlight
switch, lets you
release the tailgate
glass. To release the
glass, slide the button
to the right until you
hear the latch release.
Then, lift the window
up to open.
If you have an automatic transmission, your shift lever must be in "P"
(Park) or "N"(Neutra1) for the release to work. With a manual transmission,
you must apply the parking brake for the release to work.
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