Lexus 2008 IS250 Owner's Manual page 22

Locking and unlocking the doors (front door handles only)
Unlocking the trunk
1-2. Opening, closing and locking the doors and trunk
Press the lock button to lock the
door.
Grip the handle to unlock the
door.
Make sure to touch the sensor on
the back of the handle.
The door cannot be unlocked for 3
seconds after the door is locked.
Press the button to unlock the
trunk.
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