1998 GMC Suburban Owner's Manual - Page 110

The driver's window switch has an express-down feature that allows the window to be lowered without holding the switch. Press and hold the side of the window switch marked AUTO for one second to activate the express-down mode. The express-down mode can be canceled at any time by pressing the opposite side of the switch. To open the window partway, lightly tap the switch until the window is at the desired position. The electric hatch If you have a four-door vehicle and power windows, the power window switch has a lockout feature. This feature prevents the rear windows from operating except from the driver's position, when the front driver's side switch is in LOCK. When the switch is moved to NORM, the rear power windows will operate again. Then, lift the window up to open. The shift lever must be in PARK (P) or NEUTRAL (N) for the release to work. There is also a power door lock switch at the rear of the vehicle which will allow you to lock or unlock all of the doors. See "Power Doors Locks" in the Index. Electric Tailgate Glass Release Before operating your electric tailgate glass release, see the caution under "Your Doors and How They Work'' in this section. Horn Push on the air bag module in the center of the steering wheel to sound the horn. 2-32