ECU LEXUS ES300h 2022 User Guide

311-1. For safe use
1
For safety and security
possible that only the seat belt preten-
sioners will activate.
OThe SRS front airbags for the front pas-
senger will not activate if there is no pas-
senger sitting in the front passenger seat.
However, the SRS front airbags for the
front passenger may deploy if luggage is
put in the seat, even if the seat is unoccu-
pied.
QSRS airbag deployment conditions (SRS
side and curtain shield airbags)
OThe SRS side and curtain shield airbags
will deploy in 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 per-
pendicular to the vehicle orientation at an
approximate speed of 12 - 18 mph [20 -
30 km/h]).
OBoth SRS curtain shield airbags may
deploy in the event of a severe side colli-
sion.
OBoth SRS curtain shield airbags will
deploy in the event of vehicle rollover.
OBoth SRS curtain shield airbags may also
deploy in the event of a severe frontal
collision.
QConditions under which the SRS air-
bags may deploy (inflate), other than a
collision
The SRS front airbags and SRS curtain
shield airbags may also deploy if a serious
impact occurs to the underside of your
vehicle. Some examples are shown in the
illustration.
OHitting a curb, edge of pavement or hard
surface
OFalling into or jumpin g over a deep hole
OLanding hard or falling The SRS curtain shield airbags may also
deploy under the situations shown in the
illustration.
OThe angle of vehicle tip-up is marginal.
OThe vehicle skids and hits a curb stone.
QTypes of collisions that may not deploy
the SRS airbags (SRS front airbags)
The SRS front airbags do not generally
inflate if the vehicle is involved in a side or
rear collision, if it rolls over, or if it is involved
in a low-speed frontal collision. But, when-
ever a collision of any type causes sufficient
forward deceleration of the vehicle, deploy-
ment of the SRS front airbags may occur.
OCollision from the side
OCollision from the rear
OVehicle rollover
QTypes of collisions that may not deploy
the SRS airbags (SRS side and curtain
shield airbags)
The SRS side and curtain shield airbags
may not activate if the vehicle is subjected
to a collision from the side at certain angles,

331-1. For safe use
1
For safety and security
OThe portion of the front pillars, rear pillars
or roof side rail garnishes (padding) con-
taining the SRS curtain shield airbags
inside is scratched, cracked, or otherwise
damaged.
WARNING
QSRS airbag precautions
Observe the following precautions
regarding the SRS airbags.
Failure to do so may cause death or seri-
ous injury.
OThe driver and all passengers in the
vehicle must wear their seat belts
properly.
The SRS airbags are supplemental
devices to be used with the seat belts.
OThe 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 air-
bag 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 measured from the center
of the steering wheel to your breast-
bone. If you sit less than 10 in. (250
mm) away now, you can change your
driving position in several ways:
• Move your seat to the rear as far as you can while still reaching the pedals
comfortably.
• Slightly recline the back of the seat.
Although vehicle designs vary, many
drivers can achieve the 10 in. (250
mm) distance, even with the driver
seat all the way forward, simply by
reclining the back of the seat some-
what. If reclining the back of your seat
makes it hard to see the road, raise
yourself by using a firm, non-slippery
cushion, or raise the seat if your vehi-
cle has that feature.
• If your steering wheel is adjustable, tilt it downward. This points the airbag
toward your chest instead of your
head and neck.
The seat should be adjusted as recom-
mended by NHTSA above, while still
maintaining control of the foot pedals,
steering wheel, and your view of the
instrument panel controls.

341-1. For safe use
WARNING
OIf the seat belt extender has been con-
nected to the driver’s seat belt buckle
but the seat belt extender has not also
been fastened to the latch plate of the
driver’s seat belt, the SRS front airbags
for the driver will judge that the driver
is wearing the seat belt even though
the seat belt has not been connected.
In this case, the SRS front airbags for
the driver may not activate correctly in
a collision, resulting in death or serious
injury in the event of a collision. Be
sure to wear the seat belt with the seat
belt extender.
OThe SRS front passenger airbag also
deploys with considerable force, and
can cause death or serious injury
especially if the front passenger is very
close to the airbag. The front passen-
ger seat should be as far from the air-
bag as possible with the seatback
adjusted, so the front passenger sits
upright.
OImproperly seated and/or restrained
infants and children can be killed or
seriously injured by a deploying air-
bag. An infant or child who is too small
to use a seat belt should be properly
secured using a child restraint system.
Lexus strongly recommends that all
infants and children be placed in the
rear seats of the vehicle and properly
restrained. The rear seats are safer for
infants and children than the front pas-
senger seat. ( P.43)
ODo not sit on the edge of the seat or
lean against the dashboard.
ODo not allow a child to stand in front of
the SRS front passenger airbag unit or
sit on the knees of a front passenger.
ODo not allow the front seat occupants
to hold items on their knees.
ODo not lean against the door, the roof
side rail or the front, side and rear pil-
lars.
ODo not allow anyone to kneel on the
passenger seats toward the door or
put their head or hands outside the
vehicle.

351-1. For safe use
1
For safety and security
WARNING
ODo not attach anything to or lean any-
thing against areas such as the dash-
board, steering wheel pad and lower
portion of the instrument panel.
These items can become projectiles
when the SRS driver, front passenger
and knee airbags deploy.
ODo not attach anything to areas such
as a door, windshield, side window,
front or rear pillar, roof side rail and
assist grip.
ODo not hang coat hangers or other
hard objects on the coat hooks. All of
these items could become projectiles
and may cause death or serious injury,
should the SRS curtain shield airbags
deploy.
OIf a vinyl cover is put on the area where
the SRS knee airbag will deploy, be
sure to remove it.
ODo not use seat accessories which
cover the parts where the SRS side air-
bags inflate as they may interfere with
inflation of the SRS airbags. Such
accessories may prevent the side air-
bags from activating correctly, disable
the system or cause the side airbags to
inflate accidentally, resulting in death
or serious injury.
ODo not strike or apply significant levels
of force to the area of the SRS airbag
components or the front doors.
Doing so can cause the SRS airbags to
malfunction.
ODo not touch any of the component
parts immediately after the SRS air-
bags have deployed (inflated) as they
may be hot.
OIf breathing becomes difficult after the
SRS airbags have deployed, open a
door or window to allow fresh air in, or
leave the vehicle if it is safe to do so.
Wash off any residue as soon as possi-
ble to prevent skin irritation.
OIf the areas where the SRS airbags are
stored, such as the steering wheel pad
and front and rear pillar garnishes, are
damaged or cracked, have them
replaced by your Lexus dealer.
ODo not place anything, such as a cush-
ion, on the front passenger’s seat.
Doing so will disperse the passenger’s
weight, which prevents the sensor
from detecting the passenger’s weight
properly. As a result, the SRS front air-
bags for the front passenger may not
deploy in the event of a collision.
QModification and disposal of SRS air-
bag system components
Do not dispose of your vehicle or per-
form any of the following modifications
without consulting your Lexus dealer.
The SRS airbags may malfunction or
deploy (inflate) accidentally, causing
death or serious injury.
OInstallation, removal, disassembly and
repair of the SRS airbags
ORepairs, modifications, removal or
replacement of the steering wheel,
instrument panel, dashboard, seats or
seat upholstery, front, side and rear pil-
lars, roof side rails, front door panels,
front door trims or front door speakers
OModifications to the front door panel
(such as making a hole in it)

371-1. For safe use
1
For safety and security
Driver’s and front passenger’s seat belt reminder light
SRS warning light
“PASSENGER AIR BAG” indicator lights
Front passenger occupant 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 front passenger knee
airbag.
System components
A
B
C
WARNING
QFront passenger occupant classifica-
tion system precautions
Observe the following precautions
regarding the front passenger occupant
classification system.
Failure to do so may cause death or seri-
ous injury.
OWear the seat belt properly.
OMake sure the front passenger’s seat
belt plate has not been left inserted
into the buckle befo re someone sits in
the front passenger seat.

391-1. For safe use
1
For safety and security
QAdult*1
QChild*4
WARNING
OAdjust the front passenger seat so that
the head restraint does not touch the
ceiling. If the head restraint is left in
contact with the ceiling, the system
may not detect the front passenger
properly, leading to improper opera-
tion of the airbags.
Condition and operation in the front passenger occupant classification
system
Indicator/warning light
“PASSENGER AIR BAG” indicator lights“PASSENGER AIR BAG ON”
SRS warning lightOff
Driver’s and front passenger’s seat belt reminder lightOff*2 or flashing*3
DevicesFront passenger airbagActivatedFront passenger knee airbag
Indicator/warning light
“PASSENGER AIR BAG” indicator lights
“PASSENGER AIR
BAG OFF” or “PAS- SENGER AIR BAG
ON”
*4
SRS warning lightOff
Driver’s and front passenger’s seat belt reminder lightOff*2 or flashing*3
DevicesFront passenger airbagDeactivated or acti-
vated
*4Front passenger knee airbag

411-1. For safe use
1
For safety and security
facing child restraint system should only be installed on the front passenger seat when it
is unavoidable. ( P.45)
*6: In case the indicator light is not illuminated, consult this manual on how to install the child
restraint system properly. ( P.43)

431-2. Child safety
1
For safety and security
1-2.Child safety
Points to remember: P.43
Child restraint system: P.44
When using a child restraint system:
P.45
Child restraint system installation
method
• Fixed with a seat belt: P.47
• Fixed with a child restraint LATCH anchor: P.50
• Using an anchor bracket (for top
tether strap): P.53
The laws of all 50 states of the U.S.A.
as well as Canada now require the use
of child restraint systems.
 Prioritize and observe the warnings,
as well as the laws and regulations
Riding with children
Observe the following precautions
when children are in the vehicle.
Use a child restraint system appro-
priate for the child, until the child
becomes large eno ugh to properly
wear the vehicle’s seat belt.
 It is recommended that children
sit in the rear seats to avoid acci-
dental contact with the shift lever,
wiper switch, etc.
 Use the rear door child-protector
lock or the window lock switch to
avoid children opening the door
while driving or operating the
power window accidentally.
( P.107, 132)
 Do not let small children operate
equipment which may catch or
pinch body parts, such as the
power window, hood, trunk, seats
etc.
WARNING
QWhen children are in the vehicle
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 may injure
themselves by playing with the windows,
the 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.
Child restraint systems
Before installing a child restraint
system in the vehicle, there are pre-
cautions that need to be observed,
different types of child restraint sys-
tems, as well as installation meth-
ods, etc., written in this manual.
Use a child restraint system when
riding with a small child that cannot
properly use a seat belt. For the
child’s safety, install the child
restraint system to a rear seat. Be
sure to follow the installation method
that is in the operation manual
enclosed with the restraint system.
Table of contents
Points to remember

441-2. Child safety
for child restraint systems.
 Use a child restraint system until the
child becomes large enough to
properly wear the vehicle’s seat
belt.
 Choose a child restraint system that
suits your vehicle and is appropriate
to the age and size of the child.
QTypes of child restraint system installation methods
Confirm with the operation manual enclosed with the child restraint system about
the installation of the child restraint system.
WARNING
QWhen a child is riding
Observe the following precautions.
Failure to do so may result in death or
serious injury.
OFor effective protection in automobile
accidents and sudden stops, a child
must be properly restrained, using a
seat belt or child restraint system
which is correctly installed. For instal-
lation details, refer to the operation
manual enclosed with the child
restraint system. General installation
instruction is provided in this manual.
OLexus strongly urges the use of a
proper child restraint system that con-
forms to the weight and size of the
child, installed on the rear seat.
According to accident statistics, the
child is safer when properly restrained
in the rear seat than in the front seat.
OHolding a child in your or someone
else’s arms is not a substitute for a child
restraint system. In an accident, the
child can be crushed against the wind-
shield or between the holder and the
interior of the vehicle.
QHandling the child restraint system
If the child restraint system is not prop-
erly fixed in place, the child or other pas-
sengers may be seriously injured or even
killed in the event of sudden braking,
sudden swerving, or an accident.
OIf the vehicle were to receive a strong
impact from an accident, etc., it is pos-
sible that the child restraint system has
damage that is not readily visible. In
such cases, do not reuse the restraint
system.
OMake sure you have complied with all
installation instructions provided with
the child restraint system manufac-
turer and that the system is properly
secured.
OKeep the child restraint system prop-
erly secured on the seat even if it is not
in use. Do not store the child restraint
system unsecured in the passenger
compartment.
OIf it is necessary to detach the child
restraint system, remove it from the
vehicle or store it securely in the trunk.
Child restraint system

451-2. Child safety
1
For safety and security
QWhen installing a child restraint
system to a front passenger seat
For the safety of a child, install child
restraint systems to a rear seats. When
installing child restraint system to a
front passenger seat is unavoidable,
adjust the seat as follows and install the
child restraint system. 
Move the front seat fully rearward.
 Adjust the seatback angle to the
most upright position.When installing a forward-facing child
seat, if there is a gap between the child seat
and the seatback, adjust the seatback
angle until good contact is achieved.
Adjust the front of the seat cushion
to the uppermost position.
 Adjust the seat height to the upper-
most position.
Installation methodPage
Seat belt attachmentP.47
Child restraint LATCH
anchors attachmentP.50
Anchor brackets (for top tether strap) attachmentP.53
When using a child restraint sys-
tem