Pontiac 2002 Firebird - Manual (Page 86)

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B (LOCK): This is the only position from which you
can remove the key. This position locks your steering
wheel, ignition and automatic transmission.
If you have an automatic transmission, the ignition
switch can’t be turned to LOCK unless the shift lever
is in PARK (P).
CAUTION:
On manual transmission vehicles, 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.
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? If it is, then turn the
steering wheel left and right while you turn the
key hard. 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 unlocks the steering wheel,
ignition and automatic transmission, but does not send
electrical power to any accessories. Use this position
if your vehicle must be pushed or towed. A warning
tone will sound if you open the driver’s door when the
ignition is off and the key is in the ignition.
D (RUN): This is the position the switch returns to after
you start your engine and release the switch. The switch
stays in RUN when the engine is running. But even
when the engine is not running, you can use RUN to
operate your electrical power accessories and to display
some instrument panel warning and indicator lights.