1994 GMC Suburban Owner's Manual - Page 92

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. f a 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. 2-36