ECU TOYOTA SIENNA HYBRID 2021 (in English) Owner's Guide

731-2. Child safety
1
For safety and security
Hook
Top tether strap
■Fixing the top tether strap
to the anchor bracket (third
seats)
Install the child restraint system
in accordance to the operation
manual enclosed with the child
restraint system.
Outboard seats
Latch the hook onto the anchor
bracket and tighten the top
tether strap.
Make sure the top tether strap is
securely latched. ( P.67)
Hook
Top tether strap
Center seat
1 If the head restraint interferes
with your child restraint sys- tem, and the head restraint
can be removed, remove the
head restraint. Otherwise,
put the head restraint in the
upper most position.
(
P.182)
2 Latch the hook onto the
anchor bracket and tighten
the top tether strap.
Make sure the top tether strap is
securely latched. ( P.67)
When installing the child restraint
system with the head restraint
being raised, be sure to have the
tether strap pass underneath the
head restraint. Do not install child
restraints with V-shaped tether
strap.
Hook
Top tether strap
■Laws and regulations pertain-
ing to anchors
The LATCH system conforms to
FMVSS225 or CMVSS210.2.
Child restraint systems conforming
to FMVSS213 or CMVSS213 speci-
fications can be used.
This vehicle is designed to conform
to SAE J1819.
A
B
A
B
A
B

741-2. Child safety
WARNING
■When installing a child
restraint system
Observe the following precau-
tions.
Failure to do so m ay result in
death or serious injury.
●Firmly attach t he top tether
strap and make sure that the
belt is not twisted.
●Do not attach the top tether
strap to anything other than the
anchor bracket.
●After securing a child restraint
system, never adjust the seat.
●Follow all installation instruc-
tions provided by the child
restraint system manufacturer.
●Second seats and third center
seat: When installing the child
restraint system with the head
restraint being raised, after the
head restraint has been raised
and then the anchor bracket has
been fixed, do not lower the
head restraint.

751-3. Emergency assistance
1
For safety and security
1-3.Emergency assistance
*: If equipped
Microphone
“SOS” button
LED light indicators
Subscribers have the following
Safety Connect services avail-
able:
 Automatic Collision Notifica-
tion
*
Helps drivers receive necessary
response from emergency service
providers. ( 
P.77)
*: U.S. Patent No. 7,508,298 B2
Stolen Vehicle Location
Helps drivers in the event of vehicle
theft. (
P.77)
Emergency Assistance Button
(“SOS”)
Connects drivers to response-cen-
ter support. ( 
P.77)
Enhanced Roadside Assis-
tance
Provides drivers various on-road
assistance. ( 
P.78)
Safety Connect*
Safety Connect is a sub-
scription-based telematics
service that uses Global
Positioning System (GPS)
data and embedded cellular
technology to provide
safety and security features
to subscribers. Safety Con-
nect is supported by
Toyota’s designated
response center, which
operates 24 hours per day, 7
days per week.
Safety Connect service is
available by subscription on
select, telematics hardware-
equipped vehicles.
By using the Safety Connect
service, you are agreeing to
be bound by the Telematics
Subscription Service Agree-
ment and its Terms and
Conditions, as in effect and
amended from time to time,
a current copy of which is
available at Toyota.com in
the United States,
Toyotapr.com in Puerto
Rico and Toyota.ca in Can-
ada. All use of the Safety
Connect service is subject
to such then-applicable
Terms and Conditions.
System components
Services
A
B
C

771-3. Emergency assistance
1
For safety and security
The following indicator light pat-
terns indicate specific system
usage conditions:
Green indicator light on =
Active service
 Green indicator light flashing
= Safety Connect call in pro-
cess
 Red indicator light (except at
vehicle start-up) = System
malfunction (contact your
Toyota dealer)
 No indicator light (off) =
Safety Connect service not
active
■Automatic Collision Notifi-
cation
In case of either airbag deploy-
ment or severe rear-end colli-
sion, the system is designed to
automatically call the response
center. The responding agent
receives the vehicle’s location
and attempts to speak with the
vehicle occupants to assess the
level of emergency. If the occu-
pants are unable to communi-
cate, the agent automatically
treats the call as an emergency,
contacts the nearest emer-
gency services provider to
describe the situation, and
requests that assistance be sent
to the location.
■Stolen Vehicle Location
If your vehicle is stolen, Safety
Connect can work with local
authorities to assist them in
locating and recovering the
vehicle. After filing a police
report, call the Customer Experi-
ence Center at 1-800-331-4331
in the United States, 1-877-855-
8377 in Puerto Rico or 1-888-
869-6828 in Canada, and follow
the prompts for Safety Connect
to initiate this service.
In addition to assisting law
enforcement with recovery of a
stolen vehicle, Safety-Connect-
equipped vehicle location data
may, under certain circum-
stances, be shared with third
parties to locate your vehicle.
Further information is available
at Toyota.com in the United
States, Toyotapr.com in Puerto
Rico and Toyota.ca in Canada.
■Emergency Assistance But-
ton (“SOS”)
In the event of an emergency on
the road, push the “SOS” button
to reach the Safety Connect
response center. The answering
agent will determine your vehi-
cle’s location, assess the emer-
gency, and dispatch the
necessary assistance required.
If you accidentally press the “SOS”
button, tell the response-center
agent that you are not experiencing
an emergency.
Safety Connect services

791-4. Hybrid system
1
For safety and security
1-4.Hybrid system
The illustration is an example for explanation and may differ from the actual
item.
Gasoline engine
Front electric motor (traction motor)
Rear electric motor (traction motor)
*
*: AWD models only
■When stopped/during start
off
The gasoline engine stops
*
when the vehicle is stopped.
During start off, the electric
motor (traction motor) drives the vehicle. At slow speeds or when
traveling down a gentle slope,
the engine is stopped
* and the
electric motor (traction motor) is
used.
When the shift lever is in N, the
hybrid battery (traction battery)
Hybrid system features
Your vehicle is a hybrid vehicle. It has characteristics differ ent
from conventional vehicles. Be sure you are closely familiar
with the characteristics of your vehicle, and operate it with
care.
The hybrid system combines the use of a gasoline engine and
an electric motor (traction motor) according to driving condi-
tions, improving fuel efficiency and reducing exhaust emis-
sions.
System components
A
B
C

811-4. Hybrid system
1
For safety and security
hybrid system, contact your Toyota
dealer.
■Charging the 12-volt battery
 P.508
■After the 12-volt battery has dis-
charged or when the terminal
has been removed and installed
during exchange, etc.
The gasoline engine may not stop
even if the vehicle is being driven by
the hybrid battery (traction battery).
If this continues for a few days, con-
tact your To yota dealer.
■Sounds and vibrations specific
to a hybrid vehicle
There may be no engine sound or
vibration even though the vehicle is
able to move with the “READY” indi-
cator is illuminate d. For safety,
make sure to shift the shift lever to P
and apply the parking brake when
parked.
The following sounds or vibrations
may occur when the hybrid system
is operating and are not a malfunc-
tion:
●Motor sounds may be heard from
the engine compartment.
●Sounds may be heard from the
hybrid battery (traction battery)
under the front seats when the
hybrid system starts or stops.
●Relay operating sounds such as a
snap or soft clank will be emitted
from the hybrid battery (traction
battery), under the front seats,
when the hybrid system is started
or stopped.
●Sounds from the hybrid system
may be heard when the back door
is open.
●Sounds may be heard from the
transmission when the gasoline
engine starts or stops, when driv-
ing at low speeds, or during idling.
●Engine sounds may be heard
when accelerating sharply.
●Sounds may be heard due to regenerative braking when the
brake pedal is depressed or as
the accelerator pedal is released.
●Vibration may be felt when the
gasoline engine starts or stops.
●Cooling fan sounds may be heard
from the air intake vent under the
front seat.
■Maintenance, repair, recycling,
and disposal
Contact your Toyota dealer regard-
ing maintenance, repair, recycling
and disposal. Do n ot dispose of the
vehicle yourself.
When driving with the gasoline
engine stopped, a sound, which
changes in accordance with the
driving speed, will be played in
order to warn people nearby of
the vehicle’s approach. The
sound will stop when the vehicle
speed exceeds approximately
22 mph (35 km/h).
■Acoustic Vehicle Alerting Sys-
tem
In the following cases, the Acoustic
Vehicle Alerting System may be dif-
ficult for surrounding people to hear.
●In very noisy areas
●In the wind or the rain
■If “Acoustic Vehicle Alerting
System Malfunction Visit Your
Dealer” is displayed on the
multi-information display
The system may be malfunctioning.
Have the vehicle inspected by your
Toyota dealer.
Acoustic Vehicle Alerting
System

831-4. Hybrid system
1
For safety and security
The illustration is an example for explanation and may differ from the actual
item.
Warning label
Service plug
Rear electric motor (traction motor)
*
Hybrid battery (traction battery)
High voltage cables (orange)
Front electric motor (traction motor)
Power control unit
Air conditioning compressor
*: AWD models only
Hybrid system precautions
Take care when handling the hybrid system, as it is a high
voltage system (about 650V at maximum) as well as contains
parts that become extremely hot when the hybrid system is
operating. Obey the warning labels attached to the vehicle.
System components
A
B
C
D
E
F
G
H

851-4. Hybrid system
1
For safety and security
There are air intake vents under
the front seats for the purpose of
cooling the hybrid battery (trac-
tion battery). If the vent
becomes blocked, the hybrid
battery (traction battery) may
overheat, leading to a reduction
in hybrid battery (traction bat-
tery) output.
WARNING
●If a fire occurs in the hybrid
vehicle, leave the vehicle as
soon as possible. Never use a
fire extinguisher that is not
meant for electric fires. Using
even a small amount of water
may be dangerous.
●If your vehicle needs to be
towed, do so with four wheels
raised. If the wheels connected
to the electric motor (traction
motor) are on the ground when
towing, the motor may continue
to generate electricity. This may
cause a fire. ( P.462)
●Carefully inspect the ground
under the vehicle. If you find
that liquid has leaked onto the
ground, the fuel system may
have been damaged. Leave the
vehicle as soon as possible.
■Hybrid battery (traction bat-
tery)
●Never resell, hand over or mod-
ify the hybrid battery. To prevent
accidents, hybrid batteries that
have been removed from a dis-
posed vehicle are collected
through Toyota dealer. Do not
dispose of the battery yourself.
Unless the battery is properly col-
lected, the follo wing may occur,
resulting in dea th or serious
injury:
• The hybrid battery may be ille- gally disposed of or dumped,
and it is hazardous to the envi-
ronment or someone may touch
a high voltage part, resulting in
an electric shock.
• The hybrid battery is intended to be used exclusively with your
hybrid vehicle. If the hybrid bat-
tery is used out side of your
vehicle or modified in any way,
accidents such as electric
shock, heat generation, smoke
generation, an explosion and
electrolyte leakage may occur.
When reselling or handing over
your vehicle, the possibility of an
accident is extremely high
because the person receiving the
vehicle may not be aware of these
dangers.
●If your vehicle is disposed of
without the hybrid battery hav-
ing been removed, there is a
danger of serious electric shock
if high voltage parts, cables and
their connectors are touched. In
the event that your vehicle must
be disposed of, the hybrid bat-
tery must be disposed of by
your Toyota dealer or a qualified
service shop. If the hybrid bat-
tery is not disposed of properly,
it may cause electric shock that
can result in dea th or serious
injury.
Hybrid battery (traction
battery) air intake vents

871-4. Hybrid system
1
For safety and security
instructions.
■If a warning light comes on, a
warning message is displayed,
or the 12-volt battery is discon-
nected
The hybrid system may not start. In
this case, try to start the system
again. If the “READY” indicator does
not come on, contact your Toyota
dealer.

881-5. Theft deterrent system
1-5.Theft deterrent system
The indicator light flashes after
the power switch has been
turned to OFF to indicate that
the system is operating.
The indicator light stops flashing
after the power switch has been
turned to ACC or ON to indicate
that the system has been can-
celed.
■System maintenance
The vehicle has a maintenance-free
type immobilizer system.
■Conditions that may cause the
system to malfunction
●If the grip portion of the key is in
contact with a metallic object
●If the key is in close proximity to or
touching a key to the security sys-
tem (key with a built-in transpon-
der chip) of another vehicle
Immobilizer system
The vehicle’s keys have
built-in transponder chips
that prevent the hybrid sys-
tem from starting if a key
has not been previously
registered in the vehicle’s
on-board computer.
Never leave the keys inside
the vehicle when you leave
the vehicle.
This system is designed to
help prevent vehicle theft but
does not guarantee absolute
security against all vehicle
thefts.
Operating the system
NOTICE
■To ensure the system oper-
ates correctly
Do not modify or remove the sys-
tem. If modified or removed, the
proper operation of the system
cannot be guaranteed.