Lexus ES-300 2001 Manual page 297

STARTING AND DRIVING
"START" – Starter motor on. The key will return to
the "ON" position when released.
For starting tips, see page 283.
"ON" – Engine on and all accessories on.
This is the normal driving position.
NOTICE
Do not leave the key in the "ON" position if the
engine is not running. The battery will discharge
and the electronic ignition system could be
damaged.
"ACC" – Accessories such as the radio operate, but
the engine is off.
31E070
280
If you leave the key in the "ACC" or "LOCK" position and
open the driver's door, a buzzer will remind you to
remove the key.