2021 TOYOTA SIENNA HYBRID Owners Manual (in English)

3525-1. Using the air conditioning system and defogger
(Customizable features: P.551)
■Main control screen
Adjust the left side seat tem-
perature setting
Adjust the fan speed setting
Select the air flow mode
: Air flows to the upper body
: Air flows to the upper body and
feet
: Air flows to the feet
: Air flows to the feet and the
windshield defogger operates
Adjust the right side seat
temperature setting
Display the option control
screen. ( P.353)
“AUTO” switch (automatic
mode)
Set automatic mode on/off
(  P.353)
“OFF” switch
Turn the fan off
Set cooling and dehumidifi-
cation function
If “A/C” switch is not pressed, the
WARNING
■To prevent the windshield
from fogging up
Do not use the windshield defog-
ger switch during cool air opera-
tion in extremely humid weather.
The difference between the tem-
perature of the outside air and
that of the windshield can cause
the outer surface of the wind-
shield to fog up, blocking your
vision.
■To prevent burns
●Vehicles with outside rear view
mirror defoggers: Do not touch
the outside rear view mirror sur-
faces, as they can become very
hot and burn you.
●Vehicles with windshield wiper
deicer: Do not touch the glass at
lower part of the windshield or
to the side of the front pillars
when the windshield wiper de-
icer is on.
NOTICE
■To prevent 12-volt battery dis-
charge
Do not leave the air conditioning
system on longer than necessary
when the hybrid system is off.
■When repairing/replacing
parts of the air conditioning
system
Have repair/replacement per-
formed by your Toyota dealer.
When a part of th e air condition-
ing system, such as the evapora-
tor, is to be replaced, it must be
replaced with a new one.
Front air conditioning
control screen
A
B
C
D
E
F
G
H

3535-1. Using the air conditioning system and defogger
5
Interior features
system will blow ambient tempera-
ture air or heated air.
“SYNC” switch ( P.355)
Vehicles with “3-ZONE” mode: If
the indicator on the “SYNC” switch
is off, the temperature for the driver,
front passenger and rear seats can
be adjusted separately.
Vehicles with “4-ZONE” mode: The
temperature for the driver, front
passenger, left-hand side rear
seats and right-hand side rear
seats can be adjusted separately.
Set eco air conditioning
mode
The air conditioning is controlled
with low fuel consumption priori-
tized such as reducing fan speed,
etc.
■Option control screen
Select “Options” to display the
option control screen.
The functions can be switched on
and off.
When the function i s on, the indica-
tor illuminates on the screen.
“SYNC” switch ( P.355)
Vehicles with “3-ZONE” mode: If
the indicator on the “SYNC” switch
is off, the temperature for the driver,
passenger and rear seats can be adjusted separately.
Vehicles with “4-ZONE” mode: The
temperature for the driver, front
passenger, left-hand side rear
seats and right-hand side rear
seats can be adjusted separately.
Set cooling and dehumidifi-
cation function
If “A/C” switch is not pressed, the
system will blow ambient tempera-
ture air or heated air.
Set eco air conditioning
mode
The air conditioning is controlled
with low fuel con
sumption priori-
tized such as reducing fan speed,
etc.
1 Press the “AUTO” switch on
the air conditioning operation
panel or select the “AUTO”
switch on the control screen.
The dehumidification function
begins to operate. Air outlets and
fan speed are automatically
adjusted according to the tempera-
ture setting and humidity.
2 Adjust the temperature set-
ting.
3 To stop the operation, press
the “OFF” switch on the air
conditioning operation panel
or select the “OFF” switch on
the control screen.
If the fan speed setting or air
flow modes are operated, the
automatic mode indicator goes
off. However, automatic mode
I
J
A
Using automatic mode
B
C

3545-1. Using the air conditioning system and defogger
for functions other than that
operated is maintained.
■Using automatic mode
Fan speed is adjusted automati-
cally according to the temperature
setting and the ambient conditions.
Therefore, the fan may stop for a
while until warm or cool air is ready
to flow immediately after the auto-
matic mode switch is pressed.
This function automatically con-
trols the air conditioning airflow
so that priority is given to the
front seats. When the front pas-
senger seat is not occupied, air-
flow may switch to only the
driver’s seat. Unnecessary air
conditioning is suppressed, con-
tributing to increased fuel effi-
ciency.
Front seat concentrated airflow
mode operates in the following
situations.
 No passengers are detected
in the rear seats
 The windshield defogger is
not operating
While operating, illumi-
nates.
■Manually turning front seat
concentrated airflow mode
on/off
In front seat concentrated air-
flow mode, directing airflow to the front seats only and to all
seats can be switched via switch
operation. When the mode has
been switched manually, auto-
matic airflow control stops oper-
ating.
Press on the air condition-
ing operation panel and switch
the airflow.

Indicator illuminated: Airflow
to the front seats only
 Indicator off: Airflow to all the
seats
■Operation of automatic airflow
control
●In order to maintain a comfortable
interior, airflow may be directed to
seats without passengers immedi-
ately after the hybrid system is
started and at other times depend-
ing on the outside temperature.
●After the hybrid system is started,
if passengers move around inside
or enter/exit the vehicle, the sys-
tem cannot accura tely detect the
presence of passengers and auto-
matic airflow co ntrol will not oper-
ate.
■Operation of manual airflow
control
Even if the funct ion is manually
switched to directing airflow to only
the front seats, w hen a rear seat is
occupied, it may automatically direct
airflow to all seats.
■To return to automatic airflow
control
1 With the indicator off, turn the
power switch off.
2 After 60 minutes or more elapse,
turn the power switch to ON.
Front seat concentrated
airflow mode (S-FLOW)

3555-1. Using the air conditioning system and defogger
5
Interior features
The air conditioning system can
be switched between the indi-
vidual and synchronous modes.
The mode switches each time
the “SYNC” switch is operated
on the air conditioning operation
panel or the “SYNC” is selected
on the control screen.
Vehicles with “3-ZONE” mode
 In the individual mode, the
temperature for the driver,
front passenger, and rear
seats can be adjusted sepa-
rately.
 In the synchronous mode, the
driver’s side temperature con-
trol switch can be used to
adjust the temperature for the
driver, front passenger, and
rear seats.
• To adjust the temperature for the
front passenger seat separately
from other seats: operate the
front passenger’s side tempera-
ture control switch. (The “SYNC”
of “PASSSYNC” display disap-
pears)
• To adjust the temperature for the rear seats separately from the
front seats: when the synchro-
nous mode is on , operate the
“REAR” switch. Then, operate the
driver’s side or front passenger’s
side temperature control switch
upwards to increase the rear
seats temperature and down- wards to decrease the rear seats
temperature. (The “SYNC” of
“REAR SYNC” display on the
front air conditioning operation
panel and “SYNC” display on the
rear air conditioning operation
panel disappear)
Vehicles with “4-ZONE” mode
 In the individual mode, the
temperature for the driver,
front passenger, left-hand
side rear seats, and right-
hand side rear seats can be
adjusted separately by the
corresponding temperature
control switch on the front and
rear air conditioning operation
panels.
 In the synchronous mode, the
driver’s side temperature con-
trol switch can be used to
adjust the temperature for the
driver, front passenger, left-
hand side rear seats, and
right-hand side rear seats.
• To adjust the temperature for the
front passenger s eat separately
from other seats: operate the
front passenger’s side tempera-
ture control switch. (The “SYNC”
of “PASSSYNC” display disap-
pears)
• To adjust the temperature for the rear seats separately from the
front seats: when the synchro-
nous mode is on, operate the
“REAR” switch. Then, operate the
driver’s side temperature control
switch upwards to increase the
rear seats temperature and
downwards to decrease the rear
Switching between the
individual and synchro-
nous modes

3565-1. Using the air conditioning system and defogger
seats temperature. (The “SYNC”
of “REAR SYNC” display on the
front air conditioning operation
panel disappears)
To adjust the temperature for the
right-hand side rear seats sepa-
rately from the left-hand side rear
seats, operate the passenger’s
side temperature control switch.
(The “SYNC” of “RIGHT SYNC”
display on the rear air condition-
ing operation panel disappears)
• To adjust the temperature for the driver’s seat and passenger’s
seat separately from the rear
seats: when the synchronous
mode is on, operate the passen-
ger’s side temperature control
switch to adjust t he front passen-
ger’s seat temperature. Then
operate the “REAR” switch, and
operate the driver’s side tempera-
ture control switch to adjust the
rear seats temperature. (The
“SYNC” of “REAR SYNC” display
and the “SYNC” of “PASSSYNC”
display on the front air condition-
ing operation panel disappear)
To adjust the temp erature for the
driver’s seat, operate the “REAR”
switch again and operate driver’s
side temperature switch.
Operate the “REAR” switch.
The modes between the rear air
conditioning system and the front
air conditioning system switches
each time the “REAR” switch is
operated.
The air conditioning system switches between
individual and
synchronous modes each time the
“SYNC” switch is operated.
(  P.355)
If the system is left untouched for
approximately 6 seconds after
changing to the rear air condition-
ing system, the control mode in the
front control pane l returns to the
front.
 Adjusting the temperature
setting
Vehicles with “3-ZONE” mode
Operate the driver’s or passen-
ger’s side temperature control
switch upwards to increase the
temperature and operate the
switch downwards to decrease
the temperature.
Vehicles with “4-ZONE” mode
Operate the passenger’s side
temperature control switch to
adjust the right-hand rear seats
temperature, and operate the
driver’s side temperature control
switch to adjust the left-hand
side rear seats temperature.
Operate the temperature con-
trol switch upwards to increase
the temperature and operate the
switch downwards to decrease
the temperature.
 Fan speed setting
Operate the fan speed control
switch upwards to i ncrease the fan
speed and downwards to decrease
the fan speed.
Touch the “OFF” swit ch to turn the
fan off.
Changing the rear seat
settings (if equipped)

3575-1. Using the air conditioning system and defogger
5
Interior features
Change the airflow mode
Operate the airflow mode control
switch.
The airflow mode changes each
time the switch is operated.
( P.359)
 Using automatic mode
Press the “AUTO” switch. ( P.359)
■Location of air outlets
The air outlets and air volume
change according to the
selected air flow mode.
■Adjusting the air flow direc-
tion and opening/closing
the air outlets
Front center outlets
Direct air flow to the left or right, up or down
Front side outlets
1 Direct air flow to the left or
right, up or down
2 Open the vent
3 Close the vent
Air outlet layout and oper-
ations
WARNING
■To not interrupt the wind-
shield defogger from operat-
ing
Do not place anything on the
instrument panel which may cover
the air outlets. Otherwise, air flow
may be obstructed, preventing the
windshield defoggers from defog-
ging.

3585-1. Using the air conditioning system and defogger
“AUTO” switch (automatic mode)
“OFF” switch
Left-hand side temperature control switch
Right-hand side temperature control switch (if equipped)
Fan speed control switch
Airflow mode control switch
■Adjusting the temperature
setting
Vehicles with “3-ZONE” mode
In the individual mode, operate
the temperature control switch
upwards to increase the rear
seats temperature and down-
wards to decrease the rear
seats temperature.
To change to the synchronous
mode from the individual mode,
press the “OFF” switch and then
press the “AUTO” switch.
Vehicles with “4-ZONE” mode
To adjust the temperature for
the left-hand side rear seats and
right-hand side rear seats
together, operate the rear left-
hand side temperature control
switch upwards to increase the
temperature and downwards to
decrease the temperature.
To adjust the temperature for
the right-hand side rear seats
separately from the left-hand
side rear seats, operate the
right-hand side temperature
control switch. Then, operate
Rear automatic ai r conditioning system
Air outlets and fan speed are automatically adjusted accord-
ing to the temperature setting.
Air conditioning controls
A
B
C
D
E
F

3595-1. Using the air conditioning system and defogger
5
Interior features
the left-hand side temperature
control switch to adjust the left-
hand rear seats. (The “SYNC” of
“RIGHT SYNC” display on the
rear air conditioning operation
panel disappears)
To change to the synchronous
mode from the individual mode,
press the “OFF” switch and then
press the “AUTO” switch.
■Adjusting the fan speed set-
ting
Operate the fan speed control
switch upwards to increase the
fan speed and downwards to
decrease the fan speed.
Press the “OFF” switch to turn off
the fan.
■Change the airflow mode
Press the airflow mode control
switch.
The airflow mode changes as fol-
lows each time the switch is
pressed.
1 Upper body
2 Upper body and feet 3
Feet
■Ventilation and air conditioning
odors
●During use, various odors from
inside the vehicle may enter into
and accumulate in the air condi-
tioning system. This may then
cause odor to be emitted from the
vents.
●To reduce potential odors from
occurring: The start timing of the
blower may be delayed for a short
period of time immediately after
the air conditioning system is
started in automatic mode.
1Press the “AUTO” switch.
(“AUTO” appears on the dis-
play)
The dehumidification function
begins to operate. Air outlets and
fan speed are automatically
adjusted according to the tempera-
ture setting.
2 Adjust the temperature set-
ting.
3 To stop the operation, press
the “OFF” switch.
If the fan speed se tting or air flow
modes are operated, the automatic
mode indicator goes off. However,
automatic mode for functions other
than that operated is maintained.
MODE
NOTICE
■To prevent 12-volt battery dis-
charge
Do not leave the rear air condi-
tioning system on longer than
necessary when the engine is not
running.
Using the automatic mode