Oldsmobile 1999 Alero - Manual (Page 76)

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With the ignition key in the ignition switch, you can turn
the switch to four positions.
OFF (A): Before you put the key into the ignition
switch, the switch is off. It is the only position from
which you can remove the key. This position locks your
ignition and transaxle. A warning chime will sound if
you open the driver’s door when the ignition is off and
the key is in the ignition.
ACC (Accessory) (B): This position unlocks the
transaxle. It also lets you use things like the radio and
windshield wipers when the engine is not running. To
use ACC, turn the key to the right. Use this position if
your vehicle must be pushed or towed, but never try to
push
- start your vehicle.
ON (C): This position is where the key returns after you
start your engine and release the switch. The switch
stays in ON when the engine is running. But even when
the engine is not running, you can use ON to operate
your electrical power accessories and to display some
instrument panel warning 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.
NOTICE:
If your key seems stuck in OFF and you can’t
turn it, be sure you are using the correct key; if
so, is it all the way in? 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.