ECU TOYOTA SIENNA HYBRID 2021 Owners Manual (in English)

SIENNA_OM_OM08031U_(U)
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Pictorial indexSearch by illustration
For safety
and securityMake sure to read through them
(Main topics: Child seat, theft deterrent system)
Vehicle status
information and
indicatorsReading driving-related information
(Main topics: Meters, multi-information display)
Before driving
Opening and closing the doors and windows,
adjustment before driving
(Main topics: Keys, doors, seats, power windows)
Driving
Operations and advice which are necessary for
driving
(Main topics: Starting hybrid system, refueling)
Interior featuresUsage of the interior features
(Main topics: Air conditioner, storage features)
Maintenance
and careCaring for your vehicle and maintenance
procedures
(Main topics: Interior and exterior, light bulbs)
When trouble
arisesWhat to do in case of malfunction and emergency
(Main topics: 12-volt battery discharge, flat tire)
Vehicle
specificationsVehicle specifications, customizable features
(Main topics: Fuel, oil, tire inflation pressure)
For ownersReporting safety defects for U.S. owners, and seat
belt and SRS airbag instructions for Canadian
owners
IndexSearch by symptom
Search alphabetically

2TABLE OF CONTENTS
For your information...................6
Reading this manual ................ 11
How to search .......................... 12
Pictorial index .......................... 14
1-1. For safe use Before driving ................... 32
For safe driving ................ 33
Seat belts ......................... 35
SRS airbags ..................... 41
Front passenger occupant classification system ...... 51
Exhaust gas precautions.. 56
1-2. Child safety Riding with children .......... 57
Child restraint systems..... 58
1-3. Emergency assistance Safety Connect ................ 75
1-4. Hybrid system Hybrid system features .... 79
Hybrid system precautions ....................................... 83
1-5. Theft deterrent system Immobilizer system .......... 88
Alarm................................ 89
2-1. Instrument cluster Warning lights and indicators....................................... 92
Gauges and meters (with 4.2- inch display) ................... 97Gauges and meters (with 7-
inch display) ................ 101
Multi-information display 104
Head-up display ............ 118
Energy monitor/ consumption
screen.......................... 122
3-1. Key information Keys .............................. 128
3-2. Opening, closing and lock- ing the doors
Front doors .................... 132
Sliding doors.................. 137
Back door ...................... 150
Smart key system .......... 164
3-3. Adjusting the seats Front seats .................... 169
Rear seats ..................... 171
Driving position memory 178
Head restraints .............. 182
3-4. Adjusting the steering wheel and mirrors
Steering wheel............... 185
Inside rear view mirror ... 186
Digital Rear-view Mirror . 188
Outside rear view mirrors .................................... 198
3-5. Opening, closing the win- dows and moon roof
Power windows ............. 201
Moon roof ...................... 204
1For safety and security
2
Vehicle status
information and
indicators
3Before driving

31
1
1
For safety and security
For safety and security
1-1. For safe useBefore driving ................. 32
For safe driving .............. 33
Seat belts ....................... 35
SRS airbags ................... 41
Front passenger occupant classification system .... 51
Exhaust gas precautions 56
1-2. Child safety Riding with children ........ 57
Child restraint systems... 58
1-3. Emergency assistance Safety Connect .............. 75
1-4. Hybrid system Hybrid system features .. 79
Hybrid system precautions ..................................... 83
1-5. Theft deterrent system Immobilizer sys tem ........88
Alarm.............................. 89

321-1. For safe use
1-1.For safe use
Use only floor mats designed
specifically for vehicles of the
same model and model year as
your vehicle. Fix them securely
in place onto the carpet.
1Insert the retaining hooks
(clips) into the floor mat eye-
lets.
2 Turn the upper knob of each
retaining hook (clip) to secure
the floor mats in place.
Always align the marks . The shape of the retaining hooks
(clips) may differ from that shown in
the illustration.
Before driving
Observe the following
before starting off in the
vehicle to ensure safety of
driving.
Installing floor mats
A
:$51,1*
Observe the following precau-
tions.
Failure to do so may cause the
driver’s floor mat to slip, possibly
interfering with t
he pedals while
driving. An unexpectedly high
speed may result or it may
become difficult to stop the vehi-
cle. This could lead to an acci-
dent, resulting in death or serious
injury.
■When installing the driver’s
floor mat
●Do not use floor mats designed
for other models or different
model year vehicles, even if
they are Toyota Genuine floor
mats.
●Only use floor mats designed
for the driver’s seat.
●Always install the floor mat
securely using the retaining
hooks (clips) provided.
●Do not use two or more floor
mats on top of each other.
●Do not place the floor mat bot-
tom-side up or upside-down.

331-1. For safe use
1
For safety and security
Adjust the angle of the seat-
back so that you are sitting
straight up and so that you do
not have to lean forward to
steer. (P.169)
Adjust the seat so that you
can depress the pedals fully
and so that your arms bend
slightly at the elbow when
gripping the steering wheel.
( P.169)
Lock the head restraint in
place with the center of the
head restraint closest to the
top of your ears. ( P.182)
Wear the seat belt correctly.
( P.36)
WARNING
■Before driving
●Check that the floor mat is
securely fixed in the correct
place with all the provided
retaining hooks (clips). Be espe-
cially careful to perform this
check after cleaning the floor.
●With the hybrid system stopped
and the shift lever in P, fully
depress each pedal to the floor
to make sure it does not inter-
fere with the floor mat.
For safe driving
For safe driving, adjust the
seat and mirror to an appro-
priate position before driv-
ing.
Correct driving posture
A
B
C
D

351-1. For safe use
1
For safety and security
Seat belts
Make sure that all occu-
pants are wearing their seat
belts before driving the
vehicle.
WARNING
Observe the following precautions
to reduce the risk of injury in the
event of sudden braking, sudden
swerving or an accident.
Failure to do so may cause death
or serious injury.
■Wearing a seat belt
●Ensure that all passengers wear
a seat belt.
●Always wear a seat belt prop-
erly.
●Each seat belt should be used
by one person only. Do not use
a seat belt for more than one
person at once, including chil-
dren.
●Toyota recommends that chil-
dren be seated in the rear seat
and always use a seat belt
and/or an appropriate child
restraint system.
●To achieve a proper seating
position, do not recline the seat
more than necessary. The seat
belt is most effective when the
occupants are sitting up straight
and well back in the seats.
●Do not wear the shoulder belt
under your arm.
●Always wear your seat belt low
and snug across your hips.
●Always wear the belt with the
shoulder portion over the out-
side armrest and the lap portion
under the outside armrest.
■Pregnant women
Obtain medical advice and wear
the seat belt in the proper way.
(  P.36)
Women who are pregnant should
position the lap belt as low as
possible over the hips in the same
manner as other occupants,
extending the shoulder belt com-
pletely over the shoulder and
avoiding belt contact with the
rounding of the abdominal area.
If the seat belt is not worn prop-
erly, not only the pregnant
woman, but also the fetus could
suffer death or serious injury as a
result of sudden braking or a colli-
sion.
■People suffering illness
Obtain medical advice and wear
the seat belt in the proper way.
(  P.36)
■When children are in the vehi-
cle
 P.67
■Seat belt damage and wear
●Do not damage the seat belts
by allowing the belt, plate, or
buckle to be jammed in the
door.

361-1. For safe use
Extend the shoulder belt so
that it comes fully over the
shoulder, but does not come
into contact with the neck or
slide off the shoulder. 
Position the lap belt as low as
possible over the hips.
 Adjust the position of the
seatback.
Sit up straight and well back
in the seat.
 Do not twist the seat belt.
■Child seat belt usage
The seat belts of your vehicle were
principally designed for persons of
adult size.
●Use a child restraint system
appropriate for the child, until the
child becomes large enough to
properly wear the vehicle’s seat
belt. ( P.58)
●When the child becomes large
enough to properl y wear the vehi-
cle’s seat belt, follow the instruc-
tions regarding seat belt usage.
(  P.35)
■Seat belt extender
If your seat belts cannot be fastened
securely because they are not long
enough, a personalized seat belt
extender is available from your
Toyota dealer free of charge.
WARNING
●Inspect the seat belt system
periodically. Check for cuts,
fraying, and loose parts. Do not
use a damaged sea t belt until it
is replaced. Damaged seat belts
cannot protect an occupant
from death or serious injury.
●Ensure that the belt and plate
are locked and the belt is not
twisted.
If the seat belt does not function
correctly, immediately contact
your Toyota dealer.
●Replace the seat assembly,
including the belts, if your vehi-
cle has been involved in a seri-
ous accident, even if there is no
obvious damage.
●Do not attempt to install,
remove, modify, disassemble or
dispose of the seat belts. Have
any necessary repairs carried
out by your Toyota dealer. Inap-
propriate handling may lead to
incorrect operation.
Correct use of the seat
belts
WARNING
■Using a seat belt extender
Observe the following precautions
to reduce the risk of injury in the
event of sudden braking, sudden
swerving or an accident.
Failure to do so may cause death
or serious injury.

371-1. For safe use
1
For safety and security
1To fasten the seat belt, push the plate into the buckle until
a click sound is heard.
2 To release the seat belt,
press the release button .
1 Take the plate out of the
holder, and then pull down
the seat belt.
2 Push into until a click
sound is heard.
Plate “A”
Buckle “A”
WARNING
●Do not wear the seat belt
extender if you can fasten the
seat belt without the extender.
●Do not use the seat belt
extender when installing a child
restraint system because the
belt will not securely hold the
child restraint system, increas-
ing the risk of death or serious
injury in the event of an acci-
dent.
●The personalized extender may
not be safe on another vehicle,
when used by another person,
or at a different seating position
other than the one originally
intended.
NOTICE
■When using a seat belt
extender
When releasing the seat belt,
press on the buckle release but-
ton on the extender, not on the
seat belt.
This helps prevent damage to the
vehicle interior and the extender
itself.
Fastening and releasing
the seat belt (except for
the third center seat)
Fastening the seat belt
(for the third center seat)
A
AB
A
B

391-1. For safe use
1
For safety and security
■Automatic locking retractor
(ALR)
When a passenger’s shoulder belt is
completely extended and then
retracted even slightly, the belt is
locked in that position and cannot
be extended. This feature is used to
hold a child restraint system (CRS)
firmly. To free the belt again, fully
retract the belt and then pull the belt
out once more.
Push the seat belt shoulder
anchor up and down while
pressing the release button .
After releasing the button, make
sure the adjuster is locked in the
position by trying t o move it up and
down.
The pretensioners help the seat
belts to quickly restrain the
occupants by retracting the seat
belts when the vehicle is sub-
jected to certain types of severe
frontal or side collision or a vehi-
cle rollover.
The pretensioners do not activate
in the event of a minor frontal
impact, a minor s ide impact or a
rear impact.
WARNING
■When using the third center
seat belt
Do not use the third center seat
belt with either buckle released.
Fastening only one of the buckles
may result in death or serious
injury in case of sudden braking,
sudden swerving or an accident.
Adjusting the seat belt
shoulder anchor height
(front and second outside
seats [8-passenger mod-
els])
A
:$51,1*
■Adjustable shoulder anchor
Always make sure the shoulder
belt is positioned across the cen-
ter of your shoulder. The belt
should be kept away from your
neck, but not falling off your
shoulder. Failure to do so could
reduce the amount of protection in
an accident and cause death or
serious injuries in the event of a
sudden stop, sudden swerve or
accident.
Seat belt pretensioners
(front seats)

411-1. For safe use
1
For safety and security
■Location of the SRS airbags
SRS front airbagsSRS driver airbag/front passenger airbag
Can help protect the head and chest of the driver and front passenger from
impact with interior components
SRS driver’s knee airbag
Can help provide dr iver protection
SRS front passenger’s seat cushion airbag
Can help restrain the front passenger
SRS side and curtain shield airbags
SRS front side airbags
Can help protect the torso of the front seat occupants
SRS airbags
The SRS airbags inflate when the vehicle is subjected to cer-
tain types of severe impacts that may cause significant injury
to the occupants. They work together with the seat belts to
help reduce the risk of death or serious injury.
SRS airbag system
A
B
C
D