Cadillac 1999 Eldorado Owner's Manual page 74

With the ignition key in the ignition, you can turn the
switch to five different positions.
ACCESSORY (A): This position lets you use things like
the radio and the windshield wipers when the engine is off.
To get into ACCESSORY, push in the key and turn it
toward you. The steering wheel will remain locked, just as
it was before you inserted the key. Once you turn the key
to ACCESSORY, be sure to then turn it to LOCK. If you
leave your key in ACCESSORY when the engine is turned
off, your battery will discharge prematurely.
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LOCK (B): Before you put the key in, the ignition will be
in LOCK. This is the only position from which you can
remove the key. This position locks the ignition, steering
wheel and transaxle. It's a theft
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.
OFF (C): This position lets you turn off the engine but
still turn the steering wheel. It doesn't lock the steering
wheel like LOCK does. Use OFF if you must have your
vehicle in motion while the engine is off (for example, if
your vehicle is being pushed).
RUN (D): This is the position for driving.
START (E): This position starts the engine.
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deterrent feature.