GMC 1999 Suburban Owner's Manual page 102

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4 Door Utility and Suburban
If you have the optional power windows, the controls
are on each of the side doors.
The driver's door has a switch for the passenger
windows as well. Your power windows will work when
the ignition has been turned to ACC or RUN.
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Push the rear of the switch with the power window
symbol on it to lower the window.
Push the front of the switch with the power window
symbol on it to raise the window.
The driver's window switch has an express
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
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activate the express down mode. The express
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.
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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.
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