Toyota Lexusc Owner's Handbook Manual page 42

NOTICE
Vehicles with power back door system — Do not push
the "LOCK" button any longer than 2 to 3 seconds.
Pushing the button longer activates an alarm. For
details, see page 24.
When you push the "UNLOCK" button, the driver's door
is unlocked. Pushing that button once again within 3
seconds from the first push, all other side doors and back
door are also unlocked.*
NOTE:
* The 2-step unlocking function can be changed.
Ask your Lexus dealer for details.
At this time, two beeps sound and the turn signal lights flash
twice.* Together with the activation of unlocking, some interior
lights will come on. For further information, see "Illuminated
entry system" on page 112.
You have 30 seconds to open a door after using the wireless
remote unlock feature.** If a door is not opened by then, all the
side doors and back door will be automatically locked again.
Even if the "LOCK" or "UNLOCK" button is kept pressed in, the
locking or unlocking operation is not repeated. Release the
button and then push again.
NOTE:
* The turn signal lights can be set not to flash and the beep
can be set not to sound.
** The time before automatic re-locking can be changed.
Ask your Lexus dealer for details.
KEYS AND DOORS
23