Unlocking Trunk
WARNING: This page is about a different car, the 2002 Lexus GS 430 and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
When you keep the button pushed for about 1 second, you can unlock the trunk lid (the operation method can be changed). One beep sounds. This function does not work when the ignition key is in the ON position.