Chevrolet 2003 Silverado 1500 Pickup Owner's Manual page 109

B (ACCESSORY): This position allows you to use
things like the radio, power windows and the windshield
wipers when the engine is off.
On m a n d transmission v,,,icles, turning the
key to LOCK will lock the steering column and
result in a loss of ability to steer the vehicle.
This could cause a collision. If you need to
turn the engine off while the vehicle is moving,
turn the key only to OFF. Don't press the key
release button while the vehicle is moving.
Key Release Button (Manual
Transmission)
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 these works,
then your vehicle needs service.
C (RUN): This is the position for driving.
The ignition key cannot be
removed from the ignition
of manual transmission
vehicles unless the
key release button is used.
To remove the key on manual transmission vehicles,
turn the key to ACC, then press the button and turn the
key to LOCK. Do not hold the button in while turning
the key to ACC. Pull the key straight out.
D (START): This position starts your engine.
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