Pontiac 2004 Vibe - Manual (Page 81)

(A) LOCK: This is the only position from which you can
remove the key. This locks your steering wheel,
ignition and automatic transaxle. Push in the ignition
switch as you turn the key toward you.
If you have an automatic transaxle, the ignition switch
can’t be turned to LOCK unless the shift lever is in
PARK (P).
{ CAUTION:
On manual transaxle vehicles, turning the key
to LOCK and removing it 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 ACC. Don’t push
the key in while the vehicle is moving.
(B) ACC (ACCESSORY): This position operates some
of your electrical accessories (such as the radio, but
not the ventilation fan). It unlocks the steering wheel and
ignition. To move the key from ACC to LOCK, push in
the key and then turn it to LOCK.
(C) ON: This is the position the switch returns to after
you start your engine and release the switch. The switch
stays in the ON position when the engine is running.
But even when the ignition is not running, you can use
ON to operate your electrical accessories (including
the ventilation fan and 115 volt power outlet) and
to display some warning and indicator lights.
(D) START: This position starts the engine. When the
engine starts, release the key. The ignition switch
will return to ON for normal driving.
When the engine is not running, ACC and ON allow you
to operate some of your electrical accessories.
A warning tone will sound if you open the driver’s door
when the ignition is still in ACC or LOCK and the
key is in the ignition.
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