Geo 1995 Prizm Owner's Manual page 60

Ignition Switch
I W
With the key in the ignition switch, you can turn the
switch to four positions:
LOCK (A): This is
the only position in which you can
remove the key. This locks your steering wheel, ignition
and automatic transaxle. Push in the ignition switch as
you turn the top of it toward you.
If you have an automatic transaxle, the ignition switch
can't be turned to LOCK unless the shift lever is in the
PARK (P) position.
ACC (B): In this position you can operate some of your
electrical power accessories (such as the radio, but not
the ventilation fan). It unlocks the steering wheel and
ignition.
ON (C): The switch returns to this position 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 power accessories (including
the ventilation fan) and to display some warning and
indicator lights.
START ( D ) :
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 in
ACC
or LOCK and the key is in
the ignition.
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