GMC 2003 C4C042 Owner's Manual page 79

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Express Down Feature
The driver's window also has an express
that allows the window to be lowered without holding
down the switch. Press and hold the rear of the window
switch labeled AUTO for one second to activate the
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express down mode.
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The express down mode can be cancelled at any time by
pressing the front of the switch. To open the window
part way, lightly tap the switch until the window is at the
desired position.
Lockout Feature (If Equipped)
If you have a Crew Cab model with power windows, the
driver's door will have a lockout feature. When
engaged, this feature will prevent all window switches,
except the driver's window switches, from operating.
This switch is located above the four window switches
on the driver's door.. When the switch is not engaged,
all windows will return to normal operation.
2-4
Sliding Rear Window (If Equipped)
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down feature
To open the sliding rear window, unlock the latch
lever by pulling the lever toward the driver's side of
the vehicle.
To close the window, slide the window toward the
passenger's side of the vehicle. The latch lever will
automatically snap onto the latch plate. Try to open the
window without releasing the latch lever to be sure the
window is in the locked position.