GMC 2010 T-Series Owner's Manual page 45

Power Windows
Press the rearward part of the switch to lower the
window. Press the forward part of the switch to raise the
window.
The power windows will operate when the ignition is in
ACC/ACCESSORY or ON/RUN.
If your vehicle has power
windows, the switches for
both windows are located
on the driver's door. In
addition, the passenger
door has a switch for its
own window.
Power Window Lock Switch
Pressing the power window lock switch once locks the
passenger side window and prevents it from opening or
closing. Pressing the switch a second time unlocks the
passenger side window.
Express-Down
The driver's window has an express-down feature. This
allows the window to be lowered fully without
continuously holding the switch. Press the switch down
fully to initiate the express-down feature. Press the top
of the switch to stop the window from lowering.
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