ECU TOYOTA HIGHLANDER 2023 User Guide

351-1. For safe use
1
For safety and security
SRS curtain shield airbags
• Can help protect primarily the head of occupants in the outer seats
• Can help prevent the occupants from being thrown from the vehi cle in the
event of vehicle rollover
■SRS airbag system components
Front passenger airbag
“PASS AIR BAG ON” and “PASS AIR BAG OFF” indicator lights
Front side airbags
Curtain shield airbags
Side impact sensors (rear)
SRS warning light
Front passenger occupant classification system (ECU and sen-
sors)
Driver airbag
Side impact sensors (front door)
Side impact sensors (front)
Seat belt pretensioners and force limiters
Seat cushion airbag
Driver’s seat position sensor
Driver’s knee airbag
Driver’s seat bel t buckle switch
Front impact sensors

361-1. For safe use
Airbag sensor assembly
Your vehicle is equipped with ADVANCED AIRBAGS designed
based on the US motor vehicle safety standards (FMVSS208). The
airbag sensor assembly (ECU) cont rols airbag deployment based on
information obtained from the sensors etc. shown in the system
components diagram above. This in formation includes crash sever-
ity and occupant information. As the airbags deploy, a chemical
reaction in the inflators quickly fills the airbags with non-toxic gas to
help restrain the motion of the occupants.
■If the SRS airbags deploy
(inflate)
●Slight abrasions, burns, bruising
etc., may be sustained from SRS
airbags, due to the extremely high
speed deployment (inflation) by
hot gases.
●A loud noise and white powder will
be emitted.
●Parts of the airbag module (steer-
ing wheel hub, airbag cover and
inflator) as well as the front seats,
parts of the front and rear pillars,
and roof side rails, may be hot for
several minutes. T he airbag itself
may also be hot.
●The windshield may crack.
●All of the doors will be unlocked.
(  P.116)
●The brakes and st op lights will be
controlled automatically. ( P.308)
●The interior lights will turn on auto-
matically. ( P.339)
●The emergency flashers will turn
on automatically. ( P.424)
●Fuel supply to the engine will be
stopped. (P.430)
●For Safety Connect subscribers, if
any of the followin g situations
occur, the system is designed to
send an emergency call to the
response center, notifying them of
the vehicle’s location (without
needing to push the “SOS” button)
and an agent will attempt to speak
with the occupants to ascertain the level of emergency and assis-
tance required. If the occupants
are unable to communicate, the
agent automatically treats the call
as an emergency and helps to dis-
patch the necessary emergency
services. (
P. 6 5 )
• An SRS airbag is deployed.
• A seat belt pretensioner is acti-
vated.
• The vehicle is involved in a severe
rear-end collision.
■SRS airbag deployment condi-
tions (SRS front airbags)
●The SRS front airbags will deploy
in the event of an impact that
exceeds the set threshold level
(the level of forc e corresponding
to an approximately 12 - 18 mph
[20 - 30 km/h] frontal collision with
a fixed wall that does not move or
deform).
However, this threshold velocity will
be considerably higher in the follow-
ing situations:
• If the vehicle strikes an object, such as a parked vehicle or sign
pole, which can move or deform
on impact
• If the vehicle is involved in an underride collision, such as a colli-
sion in which the front of the vehi-
cle “underrides”, or goes under,
the bed of a truck
●Depending on the type of collision,
it is possible that only the seat belt
pretensioners and SRS seat cush-
ion airbag will activate.

371-1. For safe use
1
For safety and security
●The SRS front airbags for the front
passenger will not activate if there
is no passenger sitting in the front
passenger seat. However, the
SRS front airbags for the front
passenger may de ploy if luggage
is put in the seat, even if the seat
is unoccupied.
●The SRS seat cushion airbag on
the front passen ger seat will not
operate if the occupant is not
wearing a seat belt.
■SRS airbag deployment condi-
tions (SRS side and curtain
shield airbags)
●The SRS side and curtain shield
airbags will deploy i n the event of
an impact that exceeds the set
threshold level (the level of force
corresponding to the impact force
produced by an approximately
3300 lb. [1500 kg] vehicle colliding
with the vehicle cabin from a
direction perpendicular to the
vehicle orientation at an approxi-
mate speed of 12 - 18 mph [20 -
30 km/h]).
●Both SRS curtain shield airbags
may deploy in the event of a
severe side collision.
●Both SRS curtain shield airbags
will deploy in the event of vehicle
rollover.
●Both SRS curtain shield airbags
may also deploy in the event of a
severe frontal collision.
■Conditions under which the
SRS airbags may deploy
(inflate), other t han a collision
The SRS front airbags and SRS cur-
tain shield airbags may also deploy
if a serious impact occurs to the
underside of your vehicle. Some
examples are shown in the illustra-
tion.
●Hitting a curb, edge of pavement
or hard surface
●Falling into or jumping over a deep
hole
●Landing hard or falling
The SRS curtain shield airbags may
also deploy under the situations
shown in the illustration.
●The angle of vehicle tip-up is mar-
ginal.
●The vehicle skids and hits a curb
stone.
■Types of collisions that may not
deploy the SRS airbags (SRS
front airbags)
The SRS front airbags do not gener-
ally inflate if the vehicle is involved
in a side or r ear collision, if it rolls
over, or if it is involved in a
low-speed frontal collision. But,
whenever a collis ion of any type
causes sufficient forward decelera-
tion of the vehicle, deployment of
the SRS front airbags may occur.
●Collision from the side
●Collision from the rear
●Vehicle rollover

391-1. For safe use
1
For safety and security
scratched, cracked, or otherwise
damaged.
●The front passenger’s seat cush-
ion surface is scratched, cracked,
or otherwise damaged.
●The surface of the seats with the
SRS side airbag is scratched,
cracked, or otherwise damaged.
●The portion of the front pillars, rear
pillars or roof side rail garnishes
(padding) containing the SRS cur-
tain shield airbags inside is
scratched, cracked, or otherwise
damaged.
WARNING
■SRS airbag precautions
Observe the following precautions
regarding the SRS airbags.
Failure to do so may cause death
or serious injury.
●The driver and all passengers in
the vehicle must wear their seat
belts properly.
The SRS airbags are supple-
mental devices to be used with
the seat belts.
●The SRS driver airbag deploys
with considerable force, and
can cause death or serious
injury especially if the driver is
very close to the airbag. The
National Highway Traffic Safety
Administration (NHTSA)
advises:
Since the risk zone for the
driver’s airbag is the first 2 - 3
in. (50 - 75 mm) of inflation,
placing yourself 10 in. (250 mm)
from your driver airbag provides
you with a clear margin of
safety. This distance is mea-
sured from the c enter of the
steering wheel to your breast-
bone. If you sit less than 10 in.
(250 mm) away now, you can
change your driv ing position in
several ways:
• Move your seat to the rear as far as you can while still reach-
ing the pedals comfortably.

411-1. For safe use
1
For safety and security
WARNING
●Improperly seated and/or
restrained infants and children
can be killed or seriously injured
by a deploying airbag. An infant
or child who is too small to use
a seat belt should be properly
secured using a child restraint
system. Toyota strongly recom-
mends that all infants and chil-
dren be placed in the rear seats
of the vehicle and properly
restrained. The rear seats are
safer for infants and children
than the front passenger seat.
(
P. 5 0 )
●Do not sit on the edge of the
seat or lean against the dash-
board.
●Do not allow a child to stand in
front of the SRS front passenger
airbag unit or sit on the knees of
a front passenger.
●Do not allow the front seat occu-
pants to hold items on their
knees.
●Do not lean against the door,
the roof side rail or the front,
side and rear pillars.
●Do not allow anyone to kneel on
the passenger seat toward the
door or put their head or hands
outside the vehicle.
●Do not attach anything to or
lean anything against areas
such as the dashboard, steering
wheel pad and lower portion of
the instrument panel.
These items can become pro-
jectiles when th e SRS driver,
front passenger and knee air-
bags deploy.

431-1. For safe use
1
For safety and security
Vehicles with 8-inch audio
system screenSRS warning light
Driver’s and front passen-
ger’s seat belt reminder light
“PASS AIR BAG OFF” indica-
WARNING
●Modifications to the front door
panel (such as making a hole in
it)
●Repairs or modifications of the
front fender, front bumper, or
side of the occ upant compart-
ment
●Installation of a grille guard (bull
bars, kangaroo bar, etc.), snow
plows, winches or roof luggage
carrier
●Modifications to the vehicle’s
suspension system
●Installation of electronic devices
such as mobile two-way radios
and CD players
●Modifications to your vehicle for
a person with a physical disabil-
ity
Front passenger occu-
pant classification
system
Your vehicle is equipped
with a front passenger
occupant classification sys-
tem. This system detects
the conditions of the front
passenger seat and acti-
vates or deactivates the
front passenger airbag and
seat cushion airbag.
System components

451-1. For safe use
1
For safety and security
WARNING
●Do not recline the front passen-
ger seatback so far that it
touches a rear seat. This may
cause the “PASS AIR BAG
OFF” indicator light to be illumi-
nated, which indicates that the
SRS airbags for the front pas-
senger will not activate in the
event of a severe accident. If
the seatback touches the rear
seat, return the seatback to a
position where it does not touch
the rear seat. Keep the front
passenger seatback as upright
as possible when the vehicle is
moving. Reclining the seatback
excessively may lessen the
effectiveness o f the seat belt
system.
●If an adult sits in the front pas-
senger seat, the “PASS AIR
BAG ON” indicator light is illumi-
nated. If the “PASS AIR BAG
OFF” indicator is illuminated,
ask the passen ger to sit up
straight, well back in the seat,
feet on the floor, and with the
seat belt worn correctly. If the
“PASS AIR BAG OFF” indicator
still remains illuminated, either
ask the passenger to move to
the rear seat, or if that is not
possible, move the front pas-
senger seat fully rearward.
●When it is unavoidable to install
a forward-facing child restraint
system on the fr ont passenger
seat, install the child restraint
system on the fr ont passenger
seat in the proper order.
(
P. 5 2 )
●Do not modify or remove the
front seats.
●Do not kick the front passenger
seat or subject it to severe
impact. Otherwise, the SRS
warning light m ay come on to
indicate a malfu nction of the
front passenger occupant clas-
sification system. In this case,
contact your Toyota dealer
immediately.
●Child restraint systems installed
on the rear seat should not con-
tact the front seatbacks.
●Do not use a seat accessory,
such as a cushion and seat
cover, that covers the seat
cushion surface.
●Do not modify or replace the
upholstery of the front seat.

471-1. For safe use
1
For safety and security
■Unoccupied
■There is a malfunction in the system
*1: The system judges a person of adult size as an adult. When a smaller
adult sits in the front passenger seat, the system may not recognize
him/her as an adult depending on his/her physique and posture.
*2: In the event the front passenger is wearing a seat belt.
*3: In the event the front passenge r does not wear a seat belt.
*4: For some children, child in seat, child in booster seat or chi ld in convert-
ible seat, the system may not recognize him/her as a child. Fac tors
which may affect this can be the physique or posture.
*5: Never install a rear-facing ch ild restraint system on the front passenger
seat. A forward-facing child restraint system should only be in stalled on
the front passenger sea t when it is unavoidable. ( P.50)
*6: In case the indicator light is not illuminated, consult this m anual on how
to install the child restr aint system properly. (P. 5 2 )
Indicator/warning
light
“PASS AIR BAG ON” and “PASS AIR BAG OFF” indicator lights“PASS AIR BAG OFF”
SRS warning light
OffDriver’s and front passenger’s seat belt reminder light
Devices
Front passenger airbag
DeactivatedSeat cushion airbag in the front passenger side
Indicator/warning light
“PASS AIR BAG ON” and “PASS AIR BAG OFF” indicator lights“PASS AIR BAG OFF”
SRS warning lightOn
Driver’s and front passenger’s seat belt reminder lightOff
Devices
Front passenger airbag
DeactivatedFront passenger seat cushion air- bag

491-2. Child safety
1
For safety and security
1-2.Child safety
Riding with children
Observe the following pre-
cautions when children are
in the vehicle.
Use a child restraint system
appropriate for the child,
until the child becomes
large enough to properly
wear the vehicle’s seat belt.
It is recommended that chil-
dren sit in the rear seats to
avoid accidental contact
with the shift lever, wiper
switch, etc.
 Use the rear door child-pro-
tector lock or the window
lock switch to avoid children
opening the door while driv-
ing or operating the power
window accidentally.
( P.118, 164)
 Do not let small children
operate equipment which
may catch or pinch body
parts, such as the power
window, hood, back door,
seats etc.
WARNING
■When children are in the vehi-
cle
Never leave children unattended
in the vehicle, and never allow
children to have or use the key.
Children may be able to start the
vehicle or shift the vehicle into
neutral. There is also a danger
that children ma y injure them-
selves by playing with the win-
dows, the moon roof or panoramic
moon roof, or other features of the
vehicle. In addition, heat build-up
or extremely cold temperatures
inside the vehicle can be fatal to
children.

511-2. Child safety
1
For safety and security
WARNING
●Toyota strongly urges the use of
a proper child restraint system
that conforms to the weight and
size of the child, installed on the
second seat. According to acci-
dent statistics, the child is safer
when properly restrained in the
second seat than in the front
seat.
●Holding a child in your or some-
one else’s arms is not a substi-
tute for a child restraint system.
In an accident, the child can be
crushed against the windshield
or between the holder and the
interior of the vehicle.
■Handling the child restraint
system
If the child restraint system is not
properly fixed in place, the child or
other passengers may be seri-
ously injured or even killed in the
event of sudden braking, sudden
swerving, or an accident.
●If the vehicle were to receive a
strong impact from an accident,
etc., it is possib le that the child
restraint system has damage
that is not readily visible. In
such cases, do not reuse the
restraint system.
●Make sure you have complied
with all installation instructions
provided with the child restraint
system manufacturer and that
the system is properly secured.
●Keep the child restraint system
properly secured on the seat
even if it is not in use. Do not
store the child restraint system
unsecured in the passenger
compartment.
●If it is necessary to detach the
child restraint system, remove it
from the vehicle or store it
securely in the luggage com-
partment.