GMC 2002 Yukon XL, Owner'S Manual

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Ignition Positions
With the key in the ignition switch, you can turn the key
to five different positions.
A (ACCESSORY): This position lets you use things
like the radio, power windows and the windshield
wipers when the engine is off. Push in the key and
turn it toward you.
B (LOCK): This position locks your ignition and
transmission. It’s a theft
-
deterrent feature. You will only
be able to remove your key when the ignition is turned
to LOCK.
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? 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.
C (OFF): This position lets you turn off the engine.
Use OFF if you must have your vehicle in motion
while the engine is off (for example, if your vehicle is
being pushed).
D (RUN): This is the position for driving.
E (START): This position starts your engine.