key battery TOYOTA SIENNA HYBRID 2021 (in English) User Guide

1803-3. Adjusting the seats
■Seat positions that can be
memorized (P.169)
The adjusted positions other than
the position adjusted by lumbar sup-
port switch can be recorded.
■Operating the driving position
memory after turning the power
switch to OFF
Recorded seat positions can be
activated up to 1 80 seconds after
the driver’s door is opened and
another 60 seconds after it is closed
again.
■In order to correctly use the
driving position memory func-
tion
If a seat position is already in the
furthest possible position and the
seat is operated in the same direc-
tion, the recorded position may be
slightly different w hen it is recalled.
■When recalling the driving posi-
tion
Take care when recalling the driving
position so that the head restraint
does not touch the ceiling.
■If the 12-volt battery is discon-
nected
The memorized positions are
erased.
■Registering procedure
Record your driving position to
button “1” or “2” before perform-
ing the following:
Carry only the key you want to
register, and then close the
driver’s door.
If 2 or more keys are in the vehi-
cle, the driving position cannot
be recorded properly.
1 Check that the shift lever is in
P.
2 Turn the power switch to ON.
3 Recall the driving position
that you want to record.
4 While pressing the recalled
button, press and hold the
door lock switch (either lock
or unlock) until the buzzer
sounds.
If the button could not be regis-
tered, the buzzer sounds continu-
ously for approxim ately 3 seconds.
WARNING
■Seat adjustment caution
Take care during seat adjustment
so that the seat d oes not strike
the rear passenger or squeeze
your body again st the steering
wheel.
Registering/recall/cancel-
ing a driving position to
an electronic key (mem-
ory recall function)

2324-2. Driving procedures
■When the ambient temperature
is low, such as during winter
driving conditions
When starting the hybrid system,
the flashing time of the “READY”
indicator may be long. Leave the
vehicle as it is u ntil the “READY”
indicator is steady on, as steady
means the vehicle is able to move.
■Sounds and vibrations specific
to a hybrid vehicle
 P.81
■If the 12-volt battery is dis-
charged
The hybrid system cannot be
started using the smart key system.
Refer to P.506to re start the hybrid
system.
■Electronic key battery depletion
 P.128
■Conditions affecting operation
 P.166
■Note for the entry function
 P.166
■Steering lock function
●After turning the power switch to
OFF and opening and closing the
doors, the steer ing wheel will be
locked due to the steering lock
function. Operating the power
switch again automatically can-
cels the steering lock.
●When the steering lock cannot be
released, “Push Power Switch
while Turning the Steering Wheel
in Either Direction” will be dis-
played on the multi-information
display.
Check that the shift lever is set in
P. Press the power switch shortly
and firmly while turning the steer-
ing wheel left and right.
●To prevent the steering lock motor
from overheating , the motor may
be suspended if the hybrid system
is turned on and off repeatedly in
a short period of ti me. In this case,
refrain from operating the power
switch. After about 10 seconds,
the steering lo ck motor will
resume functioning.
■If there is a malfunction in the
smart key system
If “Smart Key System Malfunction
See Owner’s Manual” is displayed
on the multi-information display, the
system may be malfunctioning.
Have the vehicle inspected by your
Toyota dealer immediately.
■If the “READY” indicator does
not come on
In the event that the “READY” indi-
cator does not come on even after
performing the proper procedures
for starting the vehicle, contact your
Toyota dealer immediately.
■When “Check Fuel Cap” is dis-
played on the multi-information
display
 P.261
■If the hybrid sys tem is malfunc-
tioning
 P.86
■Electronic key battery
 P.447
■Operation of the power switch
●If the switch is not pressed shortly
and firmly, the power switch mode
may not change o r the hybrid sys-
tem may not start.
●If attempting to res tart the hybrid

2344-2. Driving procedures
the vehicle as is or selecting “Per-
form Auto Off” keeps the auto-
matic hybrid system shut off
feature enabled, or selecting
“Keep Vehicle On” disables the
automatic hybrid system shut off
feature.
●The timer for the automatic hybrid
system shut off feature will reset if
the brake pedal is depressed or if
the shift lever is in a position other
than P.
●After the vehicle is parked, if the
door is locked with the door lock
switch ( P.135) from the inside
or the mechanical key ( P.504)
from the outside, the automatic
hybrid system shut off fe ature will
be disabled. The timer for the
automatic hybrid system shut off
feature will be re-enabled if the
driver’s door is opened.
Modes can be changed by
pressing the power switch with
the brake pedal released. (The
WARNING
■Stopping the hybrid system
in an emergency
●If you want to stop the hybrid
system in an emergency while
driving the vehicle, press and
hold the power switch for more
than 2 seconds, or press it
briefly 3 times or more in suc-
cession. ( P.459)
However, do not touch the
power switch while driving
except in an emergency. Turn-
ing the hybrid system off while
driving will not cause loss of
steering or braking control, how-
ever, power assist for the steer-
ing wheel may be lost making it
difficult to steer smoothly before
stopping the vehicle depending
on the remaining charge in the
12-volt battery or usage condi-
tions. In this situation, you
should pull over and stop the
vehicle as soon as it is safe to
do so.
●If the power switch is operated
while the vehicle is running, a
warning message will be shown
on the multi-information display
and a buzzer sounds.
●When restarting the hybrid sys-
tem after an emergency shut-
down, shift the shift lever to N
and press the power switch
shortly and firmly.
■When parking
Exhaust gases include harmful
carbon monoxide (CO), which is
colorless and odorless. Observe
the following precautions.
Failure to do so may cause
exhaust gases to enter the vehicle
and may lead to an accident
caused by light-headedness, or
may lead to death or a serious
health hazard.
●If the vehicle is in a poorly venti-
lated area or a closed area,
such as a garage, stop the
hybrid system.
●Do not leave the vehicle with
the hybrid system operating for
a long time. If such a situation
cannot be avoided, park the
vehicle in an open space and
ensure that exhaust fumes do
not enter the ve hicle interior.
●Do not leave the hybrid system
operating in an area with snow
build-up, or where it is snowing.
If snowbanks build up around
the vehicle while the hybrid sys-
tem is operating, exhaust gases
may collect and enter the vehi-
cle.
Changing power switch
modes

2494-3. Operating the lights and wipers
4
Driving
■Headlight control sensor
The sensor may not function prop-
erly if an object is placed on the sen-
sor, or anything that blocks the
sensor is affixed to the windshield.
Doing so interfere s with the sensor
detecting the level of ambient light
and may cause the automatic head-
light system to malfunction.
■Automatic light off system
●When the headlights are on: The
lights turn off 30 seconds after the
power switch is turned to ACC or
OFF and a door is opened and
closed. (The lights turn off imme-
diately if on the key is
pressed after all the doors are
closed.)
●When only the tail lights are on:
The tail lights turn off automati-
cally if the power switch is turned
to ACC or OFF and the driver’s
door is opened.
Except for Canada: To turn the
lights on again, turn the power
switch to ON, or turn the light switch
off once and the n back to or
position.
For Canada: To turn the lights on
again, turn the power switch to ON,
or turn the light s witch to once
and then back to or posi-
tion.
■Light reminder buzzer
A buzzer sounds when the power
switch is turned to ACC or OFF and
the driver’s door is opened while the
lights are turned on.
■Windshield wiper linked head-
light illumination (if equipped)
When driving during daytime with
the headlight switch turned to , if
the windshield wipers are used, the
headlights will turn o n automatically
after several se conds to help
enhance the visibility of your vehi-
cle.
■12-volt battery-saving function
In order to prevent the 12-volt bat-
tery of the vehicle from discharging,
if the headlights and/or tail lights are
on when the power switch is turned
to OFF, the battery saving function
will operate and au tomatically turn
off all the lights af ter approximately
20 minutes.
When any of the following are per-
formed, the battery-saving function
is canceled once and then reacti-
vated. All the light s will turn off auto-
matically 20 minutes after the
battery-saving function has been
reactivated:
●When the headlight switch is oper-
ated
●When a door is opened or closed
■If “Headlight System Malfunc-
tion Visit Your Dealer” is dis-
played on the multi-information
display
The system may be malfunctioning.
Have the vehicle inspected by your
Toyota dealer.
■Welcome light illumination con-
trol
The parking lights and tail lights
automatically turn on at night when
the doors are un locked using the
entry function or wireless remote
control if the light switch is in the
position.
■Customization
Settings (e.g. light sensor sensitiv-
ity) can be changed.
(Customizable features: P.548)

3655-2. Using the interior lights
5
Interior features
together the front interior lights.
When a door is opened while the
front and rear interior light door
position is on, the lights turn on.
2Turns the light on
■Illuminated entry system
The lights automati cally turn on/off
according to the power switch
mode, the presence of the elec-
tronic key, whether the doors are
locked/unlocked, and whether the
doors are opened/closed.
■To prevent the 12-volt battery
from being discharged
If the interior lights remain on when
the power switch is turned to OFF,
the lights will go off automatically
after 20 minutes.
■The interior lights will turn on
automatically when
If any of the SRS airbags deploy
(inflate) or in the event of a strong
rear impact, the interior lights will
turn on automatically.
The interior lights will turn off auto-
matically after approximately 20
minutes.
The interior lights can be turned off
manually. However, in order to help
prevent further collisions, it is rec-
ommended that they be left on until
safety can be ensured.
(The interior lights may not turn on
automatically depending on the
force of the impact and conditions of
the collision.)
■Customization
Setting (e.g. the time elapsed before
the lights turn off) can be changed.
(Customizable features: P.552)
NOTICE
■To prevent 12-volt battery dis-
charge
Do not leave the lights on longer
than necessary when the hybrid
system is off.

3855-4. Using the other interior features
5
Interior features
Pull up the tab of the sun-
shade and hook the shade on
using the anchors.
To retract the sunshade, unhook
the sunshade and retract it slowly.
NOTICE
■Conditions in which the func-
tion may not operate cor-
rectly
In the following conditions, it may
not operate correctly
●The portable device is fully
charged
●There is foreign matter between
the charge area and portable
device
●The temperature of the portable
device gets higher from
charging
●The charging surface of the por-
table device is facing up
●The placement of the portable
device is out of alignment with
the charge area
●Near a TV tower, electric power
plant, gas station, radio station,
large display, airport or other
facility that generates strong
radio waves or electrical noise
●When the electronic key is in
contact with, or is covered by
the following metallic objects
• Cards to which aluminum foil is attached
• Cigarette boxes that have alu- minum foil inside
• Metallic wallets or bags
• Coins
• Hand warmers made of metal
• Media such as CDs and DVDs
●When other wireless keys (that
emit radio waves) are being
used nearby
In addition, excluding the above-
mentioned, when the charger
does not perform normally or the
operation display lamp is flashing
continuously, it is considered that
the wireless char ger is malfunc-
tioning. Contact authorized
Toyota dealer.
■To prevent failure or damage
to data
●Do not bring magnetic cards,
such as credit cards, or mag-
netic recording media, etc.,
close to the charger while
charging, otherwise, data may
disappear under the influence of
magnetism. Also, do not bring
precision instruments such as
wrist watches, etc., close to the
charger, as such objects may
break.
●Do not leave portable devices in
the cabin. The temperature
inside the cabin may become
high, when under the sun, and
cause damage to the device.
■To prevent 12-volt battery dis-
charge
When the hybrid system is
stopped, do not use the wireless
charger for a long time.
Sunshades
A

399
6
6
Maintenance and care
Maintenance and care
6-1. Maintenance and careCleaning and protecting the vehicle exterior .......... 400
Cleaning and protecting the vehicle interior ........... 403
6-2. Maintenance Maintenance requirements.................................. 406
General maintenance.. 407
Emission inspection and maintenance (I/M) pro-
grams ........................ 410
6-3. Do-it-yourself mainte- nance
Do-it-yourself service pre- cautions ..................... 411
Hood ........................... 413
Positioning a floor jack 415
Engine compartment ... 416
12-volt battery ............. 422
Tires ............................ 424
Tire inflation pressure . 438
Wheels ......... ...............440
Air conditioning filter .... 441
Cleaning the hybrid battery (traction battery) air intake
vents and filters ......... 443
Electronic key battery.. 447
Checking and replacing fuses.......................... 449
Light bulbs................... 451

4006-1. Maintenance and care
6-1.Maintenance and care
Working from top to bottom,
liberally apply water to the
vehicle body, wheel wells and
underside of the vehicle to
remove any dirt and dust.
 Wash the vehicle body using
a sponge or soft cloth, such
as a chamois.
 For hard-to-remove marks,
use car wash soap and rinse
thoroughly with water.
 Wipe away any water.
 Wax the vehicle when the
waterproof coating deterio-
rates.
If water does not bead on a clean
surface, apply wax when the vehi-
cle body is cool.
■Automatic car washes
●Before washing the vehicle:
• Fold the mirrors
• Disable the powe r sliding door
system
• Disable the power back door sys- tem (if equipped)
Start washing from the front of the
vehicle. Make sure to extend the
mirrors before driving.
●Brushes used in automatic car
washes may scratch the vehicle
surface, parts (wheel, etc.) and
harm your vehicle’s paint.
●Rear spoiler may not be washable
in some automatic car washes.
There may also be an increased
risk of damage to vehicle.
■High pressure car washes
As water may enter the cabin, do
not bring the nozzle tip near the
gaps around the doors or perimeter
of the windows, or spray these
areas continuously.
■Note for a smart key system
If the door handle becomes wet
while the electronic key is within the
effective range, t he door may lock
and unlock repeatedly. In that case,
follow the following correction pro-
cedures to wash the vehicle:
●Place the key in a position 6 ft. (2
m) or more separate from the
vehicle while the vehicle is being
washed. (Take care to ensure that
the key is not stolen.)
●Set the electronic key to battery-
saving mode to disable the smart
key system. ( P.165)
●If the electronic key is inside the
vehicle and a door handle
becomes wet during a car wash, a
buzzer may sound outside the
vehicle and “Key Detected in
Vehicle” may be shown on the
multi-information d isplay. To turn
off the alarm, lock all the doors.
■Wheels and wheel ornaments
●Remove any dirt immediately by
using a neutral detergent.
●Wash detergent off with water
immediately after use.
●To protect the paint from damage,
make sure to obs erve the follow-
ing precautions.
• Do not use acidic, alkaline or
abrasive detergent
• Do not use hard brushes
• Do not use detergent on the
Cleaning a nd protect-
ing the vehicle exte-
rior
Perform the following to
protect the vehicle and
maintain it in prime condi-
tion:
Cleaning instructions

4226-3. Do-it-yourself maintenance
The 12-volt battery is located in
the right-hand side of luggage
compartment.
■Before recharging
When recharging, the 12-volt bat-
tery produces hydrogen gas which
is flammable and explosive. There-
fore, observe the following precau-
tions before recharging:
●If recharging with the 12-volt bat-
tery installed on the vehicle, be
sure to disconnect the ground
cable.
●Make sure the power switch on
the charger is off when connecting
and disconnecting the charger
cables to the 12-volt battery.
■After recharging/reconnecting
the 12-volt battery
The hybrid system may not start.
Follow the procedure below to ini-
tialize the system.
1 Shift the shift lever to P.
2 Open and close any of the doors.
3 Restart the hybrid system.
●Unlocking the doors using the
smart key system may not be pos-
sible immediately after reconnect-
ing the 12-volt battery. If this
happens, use the wireless remote
control or the mechanical key to lock/unlock the doors.
●Start the hybrid system with the
power switch in ACC. The hybrid
system may not start with the
power switch turned off. How-
ever, the hybrid system will oper-
ate normally from the second
attempt.
●The power switch mode is
recorded by the vehicle. If the 12-
volt battery is reconnected, the
vehicle will return the power
switch mode to the status it was in
before the 1
2-volt battery was dis-
connected. Make sure to turn off
the power switch before discon-
nect the 12-volt battery. Take
extra care when connecting the
12-volt battery if the power switch
mode prior to discharge is
unknown.
If the hybrid system will not start
even after multiple attempts at all
methods above, contact your
Toyota dealer.
12-volt battery
Location
WARNING
■Chemicals in the 12-volt bat-
tery
The 12-volt battery contains poi-
sonous and corrosive sulfuric acid
and may produce hydrogen gas
which is flammable and explosive.
To reduce the risk of death or
serious injury, take the following
precautions while working on or
near the 12-volt battery:
●Do not cause sparks by touch-
ing the 12-volt battery terminals
with tools.
●Do not smoke or light a match
near the 12-volt battery.
●Avoid contact with eyes, skin
and clothes.
●Never inhale or swallow electro-
lyte.

4476-3. Do-it-yourself maintenance
6
Maintenance and care
■If the key battery is depleted
The following symptoms may occur:
●The smart key system and wire-
less remote contr ol will not func-
tion properly.
●The operational range will be
reduced.
Prepare the following before
replacing the battery:
 Flathead screwdriver
 Small flathead screwdriver
 Lithium battery CR2450
■Use a CR2450 lithium battery
●Batteries can be purchased at
your Toyota dealer, local electrical
appliance shops or camera stores.
●Replace only with the same or
equivalent type recommended by
the manufacturer.
●Dispose of used ba tteries accord-
ing to the local laws.
1 Release the lock and remove
the mechanical key.
2 Remove the key cover.
Use a screwdriver of an appropriate
size. Forcedly prying may cause
the cover damaged.
To prevent damage to the key,
cover the tip of the flathead screw-
driver with a rag.
3Remove the depleted battery
using a small flathead screw-
driver.
When removing the cover, the elec-
tronic key module may stick to the
cover and the batt ery may not be
visible. In this case, remove the
electronic key module in order to
remove the battery.
When removing the battery, use a
screwdriver of an appropriate size.
Insert a new battery with the “+” ter-
Electronic key battery
Replace the battery with a
new one if it is depleted.
Items to prepare
Replacing the battery