Lexus GS430 User Manual page 45

The doors cannot be locked using the entry function in the
following conditions:
G11029
"Key reminder alarm
If you push the lock button on the outside door handle
with an electronic key left in the vehicle, an alarm sounds
for 2 seconds and the doors will not lock.
Before you push the lock button, make sure you are carrying
the electronic key.
INFORMATION
D Do not put an electronic key on the instrument panel,
rear package tray or floor, or in the glove box or
auxiliary box near the selector lever, which falls
outside of the effective range of the entry function.
As the alarm does not sound when a key is left in such
a place, you might accidentally lock the doors by
pushing the lock button on the outside door handle
and be locked out of the vehicle. Be sure to take the
electronic key with you.
D If you have the electronic key but bring it very close
to the window or outside door handle, the alarm
might activate. In this case, keep the electronic key
a certain distance away from the window or outside
door handle and then push the lock button again.
D If the electronic key is left in the vehicle, attempting
to lock the door by pushing in the lock button located
in the inside door handle and closing the door will
unlock all the doors and activate the alarm for 2
seconds.
KEYS AND DOORS
21