Pontiac 1999 Montana Owner's Manual page 135

LOCK (B): This is the only position in which you can
remove the key. This locks your steering wheel, ignition
and transaxle.
OFF (C): This position unlocks the steering wheel,
ignition and transaxle, but does not send electrical
power to any accessories. Use this position if your
vehicle must be pushed or towed, but never try to
-
push start your vehicle. A warning chime will sound if
you open the driver's door when the ignition is off and
the key is in the ignition.
RUN (D): This is an on position to which the switch
returns after you start your engine and release the
switch. The switch stays in RUN when the engine is
running. But even when the engine is not running, you
can use RUN to operate your electrical power
accessories, and to display some instrument panel
warning lights.
START (E): This position starts the engine. When the
engine starts, release the key. The ignition switch will
return to RUN for normal driving.
Note that even if the engine is not running,
ACCESSORY and RUN are positions that allow you to
operate your electrical accessories, such as the radio.
NOTICE:
If your key seems stuck in LOCK and you can't
turn it, be sure you are using the correct key; if
so, is it all the way in? If it is, then turn the
steering wheel left and right while you turn the
key hard. But turn the key only with your hand.
Using a tool to force it could break the key or the
ignition switch. If none of this works, then your
vehicle needs service.
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