Buick 1998 Century Owner's Manual page 94

LOCK (B): Before you put the key into the ignition
switch, the switch is in LOCK. It's also the only position
from which you can remove your key. This position
locks your ignition, steering wheel and transaxle. It's a
theft-deterrent feature.
OFF (C): This position lets you turn off the engine but
still turn the steering wheel. It doesn't lock the steering
wheel. Use OFF if you must have your vehicle pushed
or towed.
RUN (D): This position is where the key returns after
you start your vehicle. With the engine off, you can
use RUN to display some of your warning and
indicator lights.
START (E): This position starts your engine.
A warning chime will sound if you open the driver's
door when the ignition is in OFF, LOCK or
ACCESSORY and the key is in the ignition.
I
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.
In case you cannot remove your key from the ignition,
find the access slot which is located underneath the
steering column below the lock cylinder.
To use this slot, remove the trim cap. Insert a key or
screwdriver into the access slot and rotate the lock
cylinder. You will now be able to remove your key from
the ignition. Be sure to replace the trim cap after use.
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