1997 GMC Sonoma Owner's Manual - Page 84

Express-Down Window The driver's window switch also an express-down has feature that allowsyou to lower it without holding the window switch. Hold the driver's window switch down for more than a half a second to activate the express-down feature. Lightly tap the switch to open the window slightly. The express-down feature can be interrupted at any time by pressing the up arrow endof the switch. Sliding Rear Window (If Equipped) Swing-Out Windows (Extended Cab) Squeeze the latch in the center of the window and slide the glass to open it. When you close the window, be sure the latch catches. Horn Press the steering wheel pad to sound the horn. 2-36