Toyota Sienna 2021, Manual

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3-2. Opening, closing and locking the doors
● When an exterior alarm sounds
once for 5 seconds
● When an interior alarm pings con-
tinuously
■ Battery-saving function (vehi-
cles with entry function)
The battery-saving function will be
activated in order to prevent the
electronic key battery and the 12-
volt battery from being discharged
while the vehicle is not in operation
for a long time.
● In the following situations, the
smart key system may take some
time to unlock the doors.
• The electronic key has been left in
an area of approximately 11.5 ft.
(3.5 m) of the outside of the vehi-
cle for 2 minutes or longer.
• The smart key system has not
been used for 5 days or longer.
● If the smart key system has not
been used for 14 days or longer,
the doors cannot be unlocked at
any doors except the driver’s
door. In this case, take hold of the
driver’s door handle, or use the
wireless remote control or the
mechanical key, to unlock the
doors.
■ Turning an electronic key to
battery-saving mode
● When battery-saving mode is set,
battery depletion is minimized by
stopping the electronic key from
receiving radio waves.
Press twice while pressing
and holding .
Confirm that the electronic key indi-
cator flashes 4 times.
While the battery-saving mode is
set, the smart key system cannot be
used. To cancel the function, press
any of the electronic key buttons.
● Electronic keys that will not be
used for long periods of time can
be set to the battery-saving mode
in advance.
■ Conditions affecting operation
The smart key system uses weak
radio waves. In the following situa-
tions, the communication between
the electronic key and the vehicle
may be affected, preventing the
smart key system, wireless remote
control and immobilizer system from
operating properly.
(Ways of coping:

P.502)
● When the electronic key battery is
depleted
● Near a TV tower, electric power
plant, gas station, radio station,
large display, airport or other facil-
ity that generates strong radio
waves or electrical noise
Situation
Correction pro-
cedure
An attempt was
made to lock the
vehicle while a
door was open.
Close all of the
doors and lock
the doors again.
Situation
Correction pro-
cedure
The power
switch was
turned to ACC
while the driver’s
door was open
(or the driver’s
door was opened
while the power
switch was in
ACC).
Turn the power
switch to OFF
and close the
driver’s door.