Global Machinery Company Sierra 1999 - Manual (Page 114)

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Locking Rear Axle
If your vehicle has this feature, your locking rear axle
can give you additional traction on snow, mud, ice, sand
or gravel. It works like a standard axle most of the time,
but when one of the rear wheels has no traction and the
other does, this feature will allow the wheel with
traction to move the vehicle.
Windows
Manual Windows
Turn the hand crank on each door to raise or lower
manual windows.
Power Windows (If Equipped)
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 window
as well. Your power windows will work when the
ignition has been turned to ACCESSORY or RUN or
when Retained Accessory Power (RAP) is present.
See “Retained Accessory Power” in the Index.
Press the rear of the switch with the power window
symbol on it to lower the window.
Press the front of the switch with the power window
symbol on it to raise the window.