Lexus GS430 User Manual page 46

KEYS AND DOORS
G11030
"Engine switch on/off reminder alarm
If you push the lock button on the outside door handle
without turning off the engine switch, an alarm sounds for
2 seconds and the doors will not lock.
Before you push the lock button, make sure you have an
electronic key and that the engine switch is off.
22
G11031
"Open door warning
If you push the lock button on the outside door handle
while any door is not completely closed, an alarm sounds
for 10 seconds and the doors will not lock.
To stop the alarm, close all the doors securely or push the
"UNLOCK" button on the electronic key.
Before you push the lock button, make sure you have an
electronic key and all the doors are securely closed.