Lexus GS430 User Manual page 50

KEYS AND DOORS
UNLOCKING THE TRUNK LID WITH ENTRY FUNCTION
G11055
When you push the trunk button on the trunk lid while
carrying an electronic key, the trunk lid will unlock.
INFORMATION
If you bring the electronic key close to the center of the
bumper, or it is close to the ground or in a high place, the
trunk lid might not unlock.
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"Key reminder alarm
If you lock your electronic key in the trunk when all doors
are locked, an alarm sounds for about 2 seconds to
remind you that the electronic key is in the trunk.
At this time, the trunk lid is unlocked. Even after the alarm
stops sounding, pushing the trunk button will unlock the trunk
lid.