belt SUBARU BRZ 2023 Workshop Manual

SRS Airbag (Supplemental Restraint System Airbag)
77
Seat, Seatbelt and SRS Airbags1
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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.
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SRS Airbag (Supplemental Restraint System Airbag)
79
Seat, Seatbelt and SRS Airbags1
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▽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.
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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
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SRS Airbag (Supplemental Restraint System Airbag)
81
Seat, Seatbelt and SRS Airbags1
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▼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.
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SRS Airbag (Supplemental Restraint System Airbag)
83
Seat, Seatbelt and SRS Airbags1
– CONTINUED –
▽Examples of the types of accidents in which the SRS curtain airbag will most likely deploy.
101789
3
12
4
1) The vehicle is involved in a severe side
impact near the front seat or the rear
seat.
2) The vehicle rolls onto its side or the roof.
3) The angle of vehicle tip-up is marginal or the skidding vehicle’s tires hit a curb-
stone laterally.
4) An offset frontal collision that is severe
enough to deploy the front airbag.
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SRS Airbag (Supplemental Restraint System Airbag)
85
Seat, Seatbelt and SRS Airbags1
– CONTINUED –
▽Examples of the types of accidents in which the SRS side airbag is unlikely to deploy.
1
3 2
4
5
101319
1) The vehicle is involved in an oblique

side-on impact.
2) The vehicle is involved in a side-on
impact in an area outside the vicinity of
the passenger compartment.
3) The vehicle strikes a telephone pole or
similar object.
4) The vehicle is involved in a side-on
impact from a motorcycle.
5) The vehicle rolls onto its side or the roof.There are many types of collisions which
might not necessarily require SRS side
airbag deployment. In the event of acci-
dents like those illustrated, the SRS side
airbag may not deploy depending on the
level of accident forces involved.
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SRS Airbag (Supplemental Restraint System Airbag)
87
Seat, Seatbelt and SRS Airbags1
– CONTINUED –
▽Examples of the types of acci -
dents in which the SRS side
airbag and SRS curtain airbag
are not designed to deploy in
most cases1) The vehicle is involved in frontal colli- sion with another vehicle (moving or stationary).
2) The vehicle is struck from behind.
3) The vehicle pitches end over end.
In the event of accidents like those illus-
trated, the SRS side airbag and SRS
curtain airbag are not designed to deploy
in most cases.1) First impact
2) Second impact
A) SRS curtain airbag
B) SRS side airbagIn an accident where the vehicle is struck
from the side more than once, the SRS
side airbag and SRS curtain airbag deploy
only once on the first impact.
Example: In the case of a double side
impact collision, first with one vehicle and
immediately followed by another from the same direction, once the SRS side airbag

and SRS curtain airbag are activated on
the first impact, they will not be activated
on the second.
■ SRS Airbag System MonitorsSRS airbag system warning lightA diagnostic system continually monitors
the readiness of the SRS airbag system
(including seatbelt pretensioners) with the
ignition switch in the “ON” position. The
SRS airbag system warn ing light will show
normal system operation by illuminating
for approximately 6 seconds when the
ignition switch is turned to the “ON” posi-
tion.
The following components are monitored
by the indicator:
 Front impact sensor
1
3 2
102056
B
A
1
2
101410
102698
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SRS Airbag (Supplemental Restraint System Airbag)
88
- Right-hand side
- Left-hand side
 Airbag control module (including
impact sensor and rollover sensor)
 Frontal airbag module
- Driver’s side
- Front passenger’s side
 Knee airbag module
- Driver’s side
 Side impact sensor
- Center pillar left-hand side
- Center pillar right-hand side
- Forward of rear wheel house left-
hand side
- Forward of rear wheel house right-
hand side
- Door left-hand side
- Door right-hand side
 Side airbag module
- Driver’s side
- Front passenger’s side
 Curtain airbag module
- Right-hand side
- Left-hand side
 Front seatbelt pretensioner and adap-
tive force limiter
- Front passenger's side
 Front seatbelt pretensioner
- Driver's side
 Seatbelt buckle switch
- Front passenger’s side 
Front passenger’s occupant detection
sensor
 Front passenger’s frontal airbag ON
and OFF indicator
 All related wiring
■ SRS Airbag System
Servicing
WARNING
If the warning light exhibits any of
the following conditions, immedi-
ately stop the vehicle in a safe
place, and consult a SUBARU
dealer. Unless a technician checks
and repairs the system as needed,
the seatbelt pretensioners and/or
the SRS airbag will not operate
properly in the event of a collision,
which may result in injury. Flashing or flickering of the
warning light No illumination of the warning
light when the ignition switch is
first turned to the “ON” position Continuous illumination of the
warning light Illumination of the warning light
while driving
WARNING
 When discarding an airbag
module or scrapping the entire
vehicle damaged by a collision,
consult your SUBARU dealer. The SRS airbag has no user-
serviceable parts. Do not use
electrical test equipment on any
circuit related to the SRS airbag
system. For required servicing of
the SRS airbag, consult your
nearest SUBARU dealer.
Tampering with or disconnecting
the system’s wiring could result
in accidental inflation of the SRS
airbag or could make the system
inoperative, which may result in
serious injury.
CAUTION
If you need service or repair in
areas indicated in the following list,
have the work performed by an
authorized SUBARU dealer. The
SRS airbag control module, impact
sensors and airbag modules are
stored in these areas.
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SRS Airbag (Supplemental Restraint System Airbag)
89
Seat, Seatbelt and SRS Airbags1
– CONTINUED –
In the event that the SRS airbag is
deployed, replacement of the system
should be performed only by an autho-
rized SUBARU dealer. When the
components of the SRS airbag system
are replaced, use only genuine
SUBARU parts.
NOTEIn the following cases, contact your
SUBARU dealer as soon as possible.
 The front part of the vehicle was
involved in an accident in which only
the driver’s SRS fron tal airbag or both
driver’s and front passenger’s SRS
frontal airbags did not deploy.
 The pad of the steering wheel, the
cover over the front passenger’s SRS
frontal airbag, or ei ther roof side (from
the front pillar to a point over the rear
seat) is scratched, cracked, or other-
wise damaged.
 The center pillar, door, rear wheel
house or rear sub frame, or an area
near these parts, was involved in an
accident in which the SRS side airbag
and SRS curtain airbag did not deploy.
 The fabric or leather of either front
seatback is cut, frayed, or otherwise
damaged.
 The rear part of the vehicle was
involved in an accident in which no
SRS airbag was deployed.
■ Precautions against Vehicle
Modification
Under the center of the instru-
ment panelOn both the righ t and left sides at
the front of the vehicle Steering wheel and column and
nearby areas Bottom of the steering column
and nearby areas Top of the dashboard on front
passenger’s side and nearby
areas Each front seat and nearby areaInside each center pillarInside each doorIn each roof side (from the front
pillar to a point over the rear seat) Between the rear seat cushion
and rear wheel house on each
side
WARNING
 To avoid accidental activation of
the system or rendering the
system inoperative, which may
result in serious injury, no modifi-
cations should be made to any
components or wiring of the SRS
airbag system. 
This includes following modifica-
tions.
- Installation of custom steering
wheels- Attachment of additional trim
materials to the dashboard- Installation of custom seats- Replacement of seat fabric or
leather- Installation of additional fabric
or leather on the front seat- Attachment of a hands-free
microphone or any other
accessory to a front pillar, a
center pillar, a rear pillar, the
windshield, a side window or
any other cabin surface that
would be near a deploying
SRS curtain airbag.
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SRS Airbag (Supplemental Restraint System Airbag)
90
Always consult your SUBARU dealer if
you want to install any accessory parts on
your vehicle.
■ How to Contact the Vehicle
Manufacturer concerning
Modifications for Persons
with Disabilities That May
Affect the Advanced Airbag
SystemChanging or moving any parts of the front
seats, rear seat, se atbelts, front bumper,
front side frame, radiator panel, instru-
ment panel, combination meter, steering
wheel, steering colu mn, tire, suspension
or floor panel can affect the operation of
the SUBARU advanced airbag system. If
you have any questions, you may contact
the following SUBARU distributors.
of Columbia>
Subaru of America, Inc.
Customer Advocacy Department
One Subaru Drive
P.O. Box 9103
Camden, NJ 08101-9877
1-800-SUBARU3 (1-800-782-2783)

Subaru Hawaii
2850-A Pukoloa St., 
Honolulu, HI 96819
877-215-0338

- Installation of additional elec- trical/electronic equipment
such as a mobile two-way
radio on or near the SRS
airbag system components
and/or wiring is not advisable.
This could interfere with
proper operation of the SRS
airbag system.- Modifications on or inside the
door panels for the purpose of
a speaker replacement or
sound insulation
 The impact sensors, which detect
the pressure of an impact, are
located in the doors. Do not
modify any components of the
doors or door trims, such as the
addition of door speakers for
example. Any modifications to
the doors will create a risk of the
airbag system becoming inopera-
tive or unintended airbag deploy-
ment.
CAUTION
Do not perform any of the following
modifications. Such modifications
can interfere with proper operation
of the SRS airbag system.
 Attachment of any equipment
(bush bar, winches, snow plow,
skid plate, etc.) other than
genuine SUBARU accessory
parts to the front end. Modification of the suspension
system or front end structure. Installation of a tire of different
size and construction from the
tires specified on the vehicle
placard attached to the driver’s
center pillar or specified for indi-
vidual vehicle models in this
Owner’s Manual. Attachment of any equipment
(side steps or side sill protectors,
etc.) other than genuine SUBARU
accessory parts to the side body.
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