Chevrolet 2000 Prizm Owner's Manual page 84

ACC (ACCESSORY) (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. To move the key from ACC
to LOCK, push in the key and then turn it to LOCK.
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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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.
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. But 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.