Ignition Positions - GMC Sierra Denali Classic 2007 Owner's Manual

Ignition Positions

Use the key to turn the ignition switch to
four different positions.
100
A (LOCK): This position locks the ignition and
transmission. It is a theft-deterrent feature. You will
only be able to remove the key when the ignition
is turned to LOCK.
Notice: Using a tool to force the key from the
ignition switch could cause damage or
break the key. Use the correct key and turn the
key only with your hand. Make sure the key
is all the way in. If it is, turn the steering wheel
left and right while you turn the key hard. If
none of this works, then your vehicle needs
service.
B (ACCESSORY): This position lets you use
things like the radio and the windshield wipers
when the engine is off.