Pontiac 2001 Aztek, Owner'S Manual, Page: 112 / 433

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Ignition Positions
With the key in the ignition, you can turn the switch to
four positions.
OFF (A): This is the only position in which you can
remove the key. This position locks the steering wheel,
ignition and transaxle.
NOTICE:
If your key seems stuck in OFF 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.
ACC (B): This position allows you to use things like the
radio and the windshield wipers when the engine is off.
This position will allow you to turn off the engine, but
still turn the steering wheel. Use ACC if you must
have your vehicle in motion while the engine is off
(for example, if your vehicle is being pushed or towed).