GMC 2003 C4C042, Owner'S Manual

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Ignition Positions
With your key in the ignition switch, you can turn it to
five different positions.
A (ACCESSORY): This position allows you to
use things like the radio, power windows and the
windshield wipers when the engine is off. To get into
ACCESSORY, push in the key and turn it toward you.
Your steering wheel will remain locked, just as it was
before you inserted the key.
B (LOCK): This position locks your ignition, steering
wheel and transmission. It’s a theft
-
deterrent feature.
You will only be able to remove your key when the
ignition is turned to LOCK.
C (OFF): This position lets you turn off the engine but
still turn the steering wheel. It doesn’t lock the steering
wheel like LOCK. 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.