ron 95 SUBARU BRZ 2023 Service Manual

SRS Airbag (Supplemental Restraint System Airbag)
72SRS airbag system warning lightIf the seatbelt buckle switch and/or front
passenger’s occupant detection system
have failed, the SRS airbag system
warning light will illuminate. Have the
system inspected by your SUBARU
dealer immediately if the SRS airbag
system warning light illuminates.
If your vehicle has sustained impact, this
may affect the proper function of the
SUBARU advanced frontal airbag system.
If the SRS airbag system warning light illu-
minates, immediately stop the vehicle in a
safe place, and consult a SUBARU
dealer.
▼ Passenger’s frontal airbag ON and
OFF indicators
: Front passenger’s frontal airbag ON
indicator
: Front passenger’s frontal airbag
OFF indicator
Refer to "Front Passenger’s Frontal
Airbag ON and OFF Indicators" P135. ▼
Occupant detection system
1) Occupant detection sensorsThe occupant detection sensors are
installed between the seat and seat rails,
and monitor the physique and posture of
the front passenger. Using this informa-
tion, the occupant det ection system deter-
mines whether the front passenger’s SRS
frontal airbag should be deployed or not.
102698
306789
102171
1
BRZ_U.book 72 ページ ２０２２年３月２９日　火曜日　午後３時５９分

SRS Airbag (Supplemental Restraint System Airbag)
73
Seat, Seatbelt and SRS Airbags1
– CONTINUED –
: Front passenger’s frontal airbag ON
indicator
: Front passenger’s frontal airbag
OFF indicator
If the front passenger’s frontal airbag ON
and OFF indicators do not work properly,
do not allow anyone to sit on the front passenger’s seat and have the occupant

detection system checked by your
SUBARU dealer.
: Front passenger’s frontal airbag ON
indicator
: Front passenger’s frontal airbag
OFF indicator
Also, if luggage is placed on the front
passenger’s seat, this may adversely
affect the ability of the system to deter-
mine deployment. This may prevent the
front passenger’s frontal airbag ON and
OFF indicators from working properly.
Check that the indicators work properly.
When the OFF indicator turns off and the
ON indicator illuminates, the front
passenger’s frontal airbag may deploy
during a collision. Remove luggage from
the front passenger’s seat.
▼ Conditions in which front
passenger’s SRS frontal airbag is
not activatedThe front passenger’s SRS frontal airbag
will not be activated when any of the
following conditions are met regarding the
front passenger’s seat:
 The seat is empty.
 The seat is equipped with an appro-
priate child restrain t system and an infant
or a child is restrained in it. (See
WARNING that follows.)
 The front passenger’s occupant detec-
tion system is malfunctioning.
WARNING
Do not kick the front passenger seat
or subject it to severe impact. Oth-
erwise, the SRS airbag system
warning light may illuminate to indi-
cate a malfunction of the front pas-
senger occupant detection system.
In this case, immediately stop the
vehicle in a safe pl ace, and consult
a SUBARU dealer.
306789
306789
BRZ_U.book 73 ページ ２０２２年３月２９日　火曜日　午後３時５９分

SRS Airbag (Supplemental Restraint System Airbag)
74
: Front passenger’s frontal airbag ON
indicator
: Front passenger’s frontal airbag
OFF indicator
If you think that the Front passenger's
frontal airbag ON/OFF indicator is incor-
rect, take the following actions.
 Ensure that no article is placed on the
seat other than the occupant.
 Ensure that the backward-forward
position and seatback of front passenger’s
seat are locked into place securely by moving the seat back and forth. (Models

equipped with manual seats only)
If the ON indicator still remains illuminated
while the OFF indicator turns off after
taking relevant corrective actions
described above, immediately contact
your SUBARU dealer for an inspection.
Even if the system has passed the dealer
inspection, it is recommended that on
subsequent trips the small adult always
take the rear seat.
NOTEWhen a small adult is seated in the
front passenger’s seat, the SUBARU
advanced frontal airbag system may or
may not activate th e front passenger’s
SRS frontal airbag depending on the
occupant’s seating posture. If the OFF
indicator remains illuminated while the
ON indicator turns off when a small
adult is seated in the front passenger's
seat, see next section “Conditions in
which front passenger's SRS frontal
airbag is activated.”▼ Conditions in which front
passenger’s SRS frontal airbag is
activatedThe front passenger’s SRS frontal airbag
will be activated for deployment upon
impact when any of the following condi-
WARNING
NEVER INSTALL A CHILD
RESTRAINT SYSTEM IN THE
FRONT PASSENGER’S SEAT EVEN
IF THE FRONT PASSENGER’S SRS
FRONTAL AIRBAG IS DEACTI-
VATED. Be sure to install it in the
REAR seat in a correct manner.
Also, it is strongly recommended
that any child restraint system
(including any booster seat) be
installed in the REAR seat, and that
even children who have outgrown a
child restraint system be also
seated in the REAR seat. This is
because children sitting in the front
passenger’s seat may be killed or
severely injured should the front
passenger’s SRS frontal airbag
deploy. REAR seats are the safest
place for children.
CAUTION
Observe the following precautions
as it increase the load on the front
passenger's seat and not work
properly. Do not install any accessory such
as a table or TV onto the
seatback.
 Do not allow the rear seat occu-
pant to place his/her hands or
legs on the front passenger's
seatback, or allow him/her to pull
the seatback.
306789
BRZ_U.book 74 ページ ２０２２年３月２９日　火曜日　午後３時５９分

SRS Airbag (Supplemental Restraint System Airbag)
75
Seat, Seatbelt and SRS Airbags1
– CONTINUED –
tions are met regarding the front
passenger’s seat.
 When the seat is occupied by an adult.
 When certain items (e.g. jug of water)
are placed on the seat.
▽ If the passenger’s frontal airbag
OFF indicator illuminates and
the ON indicator turns off even
when the front passenger’s seat
is occupied by an adult: Front passenger’s frontal airbag ON
indicator
: Front passenger’s frontal airbag
OFF indicator
This can be caused by the adult incor-
rectly sitting in the front passenger’s seat.
1. Turn the ignition switch to the “OFF”
position.
2. Ask the front passenger to set the
seatback to the upright position, sit up
straight in the center of the seat cushion,
correctly fasten the seatbelt, position his/ her legs out forward, and adjust the seat

to the rearmost position.
3. Turn the ignition switch to the “ON”
position.
If the OFF indicator remains illuminated
while the ON indica tor remains off, take
the following actions.
1. Turn the ignition switch to the “OFF”
position.
2. Make sure that the front passenger
does not use a blanket, extra seat
cushion, seat cover, extra seat heater or
massager, etc.
3. If wearing excessive layers of clothing,
the front passenger should remove any
unnecessary items before sitting in the
front passenger’s seat, or should sit in a
rear seat.
4. Turn the ignition switch to the “ON”
position and wait 6 seconds to allow the
system to complete self-checking.
Following the system check, both indica-
tors turn off for 2 seconds. Now, the ON
indicator should illuminate while the OFF
indicator remains off.
If the OFF indicator still remains illumi-
nated while the ON indicator remains off,
ask the occupant to move to the rear seat
and immediately contact your SUBARU
dealer for an inspection.
CAUTION
When the front passenger's seat is
occupied by an adult, observe the
following precautions.Failure to do so may lessen the load
on the front passenger's seat, deac-
tivating the fron t passenger's SRS
frontal airbag despite the fact that
the seat is occupied by an adult.This may result in personal injury. Do not allow the rear seat occu-
pant to lift the front passenger's
seat cushion using his/her feet. Do not place any article under the
front passenger's seat, or
squeeze any article from behind
and under the seat. Do not squeeze any article
between the front passenger's
seat and side trim/pillar, door or
center console box. This may lift
the seat cushion.
306789
BRZ_U.book 75 ページ ２０２２年３月２９日　火曜日　午後３時５９分

SRS Airbag (Supplemental Restraint System Airbag)
76▼Operation
101586
A
B
1
2
A) Driver’s side
B) Passenger’s side
1) SRS AIRBAGs deploy as soon as a
collision occurs.
2) After deployment, SRS AIRBAGs start
to deflate immediately so that the
driver’s vision is not obstructed.The SRS airbags can function only when
the ignition switch is in the “ON” position.
The SUBARU advanced frontal airbag
system is designed to determine the acti-
vation or deactivation condition of the front
passenger’s SRS frontal airbag
depending on the characteristic of item(s)
or person on the front passenger’s seat
monitored by the front passenger’s occu-
pant detection sensors. For this reason,
only the driver’s SRS frontal airbag may
deploy in the event of a collision, but this
does not mean failure of the system.
If the following sensors detect a predeter-
mined amount of force during a frontal
collision, the control module sends signals
to the airbag module(s) (only driver’s
module or both driver’s and front
passenger’s modules) instructing the
module(s) to inflate the SRS frontal
airbag(s).
BRZ_U.book 76 ページ ２０２２年３月２９日　火曜日　午後３時５９分

SRS Airbag (Supplemental Restraint System Airbag)
77
Seat, Seatbelt and SRS Airbags1
– CONTINUED –
The front impact sensors
 The impact sensors in the airbag
control module
On the driver’s side, the SRS knee airbag
also inflates with the SRS frontal airbag.
The driver’s and front passenger’s SRS
frontal airbags use dual stage inflators.
The two inflators of each airbag are trig-
gered either sequentially or simultane-
ously, depending on the severity of
impact, in the case of the driver’s SRS
frontal airbag and depending on the
severity of impact and the characteristic of
item(s) or person on the seat in the case
of the front passenger’s SRS frontal
airbag.▼ After deployment
After deployment, the SRS airbag immedi-
ately starts to deflate so that the driver’s
vision is not obstructed and the driver’s
ability to maintain control of the vehicle is
not impaired. The time required from
detecting impact to the deflation of the
SRS airbag after deployment is shorter
than the blink of an eye.
Both when only the driver’s SRS frontal
airbag deploys and the driver’s and front
passenger’s SRS frontal airbags deploy,
the driver’s and front passenger’s seatbelt
pretensioners operate at the same time. When the SRS airbag deploys, a sudden,

fairly loud inflation noise will be heard and
some smoke will be released. These
occurrences are a normal result of the
deployment. This smoke does not indicate
a fire in the vehicle.
▼ Example of the type of accident
The driver’s SRS frontal airbag and front
passenger’s SRS frontal airbag are
designed as follows.
 To deploy in the event of an accident
involving a moderate to severe frontal
collision
 To function on a one-time-only basis
The driver’s SRS frontal airbag and front
passenger’s SRS frontal airbag are not
designed as follows.
 To deploy in most lesser frontal
impacts
*1
 To deploy in most side or rear impacts
or in most rollover accidents
*2
*1: Because the necessary protection can be
achieved by the seatbelt alone.
*2: Because deployment of only the driver’s
SRS frontal airbag or both the driver’s and
front passenger’s SRS frontal airbags would
not protect the occupant in those situations.SRS airbag deployment depends on the
level of force experienced in the
passenger compartment during a colli-
sion. That level differs from one type of
collision to another, and it may have no
bearing on the visible damage done to the
vehicle itself.
CAUTION
Do not touch the SRS airbag system
components around the steering
wheel and dashboard with bare
hands right after deployment. Doing
so can cause burns because the
components can be very hot as a
result of deployment.
BRZ_U.book 77 ページ ２０２２年３月２９日　火曜日　午後３時５９分

SRS Airbag (Supplemental Restraint System Airbag)
78
▽Example of accident in which
the driver’s/driver’s and front
passenger’s SRS frontal
airbag(s) will most likely deploy
A head-on collision against a thick
concrete wall at a vehicle speed of 12 to
19 mph (20 to 30 km/h) or higher activates
only the driver’s SRS frontal airbag or both
driver’s and front passenger’s SRS frontal
airbags. The airbag(s) will also be acti-
vated when the vehicle is exposed to a
frontal impact similar in fashion and
magnitude to the collision described
above. ▽
Examples of the types of acci -
dents in which it is possible that
the driver’s/driver’s and front
passenger’s SRS frontal
airbag(s) will deploy
Only the driver’s SRS frontal airbag or
both driver’s and front passenger’s SRS
frontal airbags may be activated when the
vehicle sustains a hard impact in the
undercarriage area from the road surface
(such as when the vehicle plunges into a
deep ditch, is severely impacted or
knocked hard against an obstacle on the
road such as a curb).
101394
101313
BRZ_U.book 78 ページ ２０２２年３月２９日　火曜日　午後３時５９分

SRS Airbag (Supplemental Restraint System Airbag)
79
Seat, Seatbelt and SRS Airbags1
– CONTINUED –
▽Examples of the types of accidents in which deployment of the driver’s/driver’s and front passenger’s SRS frontal
airbag(s) is unlikely to occur2
101418
1
3 4
5
1) The vehicle strikes an object, such as a

telephone pole or sign pole.
2) The vehicle slides under the load bed of
a truck.
3) The vehicle sustains an oblique offset
frontal impact.
4) The vehicle sustains an offset frontal collision.
5) The vehicle strikes an object that can
move or deform, such as a parked
vehicle.There are many types of collisions which
might not necessarily require deployment
of driver’s/driver’s and front passenger’s
SRS frontal airbag(s). In the event of acci-
dents like those illustrated, the driver’s/
driver’s and front passenger’s SRS frontal
airbag(s) may not deploy depending on
the level of accident forces involved.
BRZ_U.book 79 ページ ２０２２年３月２９日　火曜日　午後３時５９分

SRS Airbag (Supplemental Restraint System Airbag)
80
▽Examples of the types of acci -
dents in which the driver’s/
driver’s and front passenger’s
SRS frontal airb ag(s) are not
designed to deploy in most
cases The driver’s and front passenger’s SRS

frontal airbags are not designed to deploy
in most of the following cases.
 If the vehicle is struck from the side or
from behind
 If the vehicle rolls on to its side or roof
 If the vehicle is involved in a low-speed
frontal collision
1) First impact
2) Second impactIn an accident where the vehicle is
impacted more than once, the driver’s
and/or front passenger’s SRS frontal
airbag(s) will deploy only once on the first
impact.
Example: In the case of a double collision,
first with another vehicle, then against a
concrete wall in im mediate succession,
once either or both of the driver’s and front passenger’s SRS frontal airbags is/are

activated on the first im pact, it/they will not
be activated on the second impact.
■ SRS Side Airbag and SRS
Curtain Airbag▼ SRS side airbagThe SRS side airbag is stored in the door
side of each front seat seatback, which
bears an “SRS AIRBAG” mark.
In a moderate to severe side impact colli-
sion, the SRS side airbag on the impacted
side of the vehicle deploys between the
occupant and the door panel and supple-
ments the seatbelt by reducing the impact
on the occupant’s chest and waist. The
SRS side airbag operates only for front
seat occupants.
101315
1 2
101395
100281
BRZ_U.book 80 ページ ２０２２年３月２９日　火曜日　午後３時５９分

SRS Airbag (Supplemental Restraint System Airbag)
81
Seat, Seatbelt and SRS Airbags1
– CONTINUED –
▼SRS curtain airbag
Your vehicle is equipped with a SUBARU
SRS curtain airbag system that complies
with the Federal Motor Vehicle Safety
Standard (FMVSS) No. 226.
The SRS curtain airbag on each side of
the cabin is stored in the roof side
(between the front pillar and a point over
the rear seat). An “SRS AIRBAG” mark is
located at the top of each center pillar.
In a moderate to severe side impact colli-
sion, the SRS curtain airbag on the
impacted side of the vehicle deploys
between the occupant and the side
window and supplements the seatbelt by
reducing the impact on the occupant’s
head.
In a rollover, SRS curtain airbags on both
sides of the vehicle deploy between the
occupant and the side window and
supplement the seatbelt by reducing the
impact to the occupant’s head.
In an offset frontal collision, SRS curtain
airbags on both sides of the vehicle
deploy between the occupant and the side
window and supplement the seatbelt by
reducing the impact to the occupant’s
head and chest. ▼
Operation
The SRS side airbag and SRS curtain
airbag can function only when the ignition
switch is in the “ON” position.
The following airbags deploy inde-
pendently of each other since each has its
own impact sensor.
 Driver’s SRS side airbag
 Front passenger’s SRS side airbag
 SRS curtain airbag (right-hand side)
 SRS curtain airbag (left-hand side)
Therefore, they may not both deploy in the
same accident. Also, the SRS side airbag
and SRS curtain airbag deploys inde-
pendently of the driver’s and front
passenger’s SRS frontal airbags in the
steering wheel and instrument panel.
For the locations of the sensors and
control modules, refer to "Components"
 P68.
▼ After deployment
After the deployment, the SRS side airbag
immediately starts to deflate. The time
required from detection of an impact to
deflation of an SRS side airbag after
deployment is shorter than the blink of an
eye.
The SRS curtain airbag remains inflated
for a while following deployment then
slowly deflates. The SRS side airbag and SRS curtain

airbag deploy even when no one occupies
the seat on the side on which an impact is
applied.
When the SRS side airbag and SRS
curtain airbag deploy, a sudden, fairly loud
inflation noise will be heard and some
smoke will be released. These occur-
rences are a normal result of the deploy-
ment. This smoke does not indicate a fire
in the vehicle.
▼ Example of the type of accident
The SRS side airbag and SRS curtain
airbag are designed as follows:
CAUTION
Do not touch the SRS side airbag
system components around the
front seat seatback with bare hands
right after deployment. Doing so
can cause burns because the com-
ponents can be very hot as a result
of deployment.After deployment, do not touch any
part of the SRS curtain airbag sys-
tem (from the front pillar to the part
of the roof side over the rear seat).
Doing so can cause burns because
the components can be very hot as
a result of deployment.
BRZ_U.book 81 ページ ２０２２年３月２９日　火曜日　午後３時５９分