Chevrolet 2003 Impala Owner's Manual page 88

ACC (Accessory): This is the position in which you
can operate your electrical accessories. With the key in
this position, the ignition and automatic transaxle will
unlock.
ON: This is the position to which the switch returns
after you start the 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 accessories and to display some
instrument panel cluster messages and warning
lights.
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 your electrical accessories, such as the
radio.
Retained Accessory Power (RAP)
With Retained Accessory Power (RAP), your power
windows, audio system and sunroof (option) will
continue to work for up to 10 minutes after the ignition is
turned to OFF and none of the doors is opened.
Starting Your Engine
Move your shift lever to PARK (P) or NEUTRAL (N).
Your engine won't start in any other position
-
that's a
safety feature. To restart when you're already moving,
use NEUTRAL (N) only.
Notices Don't try to shift to PARK (P) if your
vehicle is moving. If you do, you couid damage the
transaxle. Shift to PARK (P) only when your
vehicle is stopped.
A warning chime will sound if you open the driver's door
while the ignition is in OFF or ACC and the key is in
the iunition.
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