ABS SUBARU BRZ 2023 User Guide

Electronic Brake Force Distribution (EBD) System
2467-12. Electronic Brake Force Distribution (EBD) SystemThe EBD system maximizes the effective-
ness of the brakes by allowing the rear
brakes to supply a greater proportion of
the braking force. It functions by adjusting
the distribution of braking force to the rear
wheels in accordance with the vehicle’s
loading condition and speed.
The EBD system is an in tegral part of the
ABS and uses some of the ABS compo-
nents to perform its function of optimizing
the distribution of braking force. If any of
the ABS components used by the EBD
function fails, the EBD system also stops
working.
When the EBD system is operating, you
may hear a chattering noise or feel a slight
vibration in the brake pedal. This is normal
and does not indicate a malfunction.
■ EBD System MalfunctionsIf a malfunction occurs in the EBD system,
the system stops working and the
following warning lights illuminate simulta-
neously.
 Brake system warning light
 ABS warning light
 Vehicle Stability Control (VSC)
warning light
If all the warning lights remain on even
though the parking brake is released, the
brake fluid level may be low or there could
be a problem with the EBD system. Park
the vehicle in a safe place immediately
and contact an SUBARU dealer.
702779
WARNING
 Driving with the brake system
warning light on is dangerous.
This indicates your brake system
may not be working properly. If
the light remains on, have the
brakes inspected by a SUBARU
dealer immediately. If at all in doubt about whether the
brakes are operating properly, do
not drive the vehicle. Have your
vehicle towed to the nearest
SUBARU dealer for repair.
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Vehicle Stability Control (VSC)/TRAC System
249
Starting and Operating7
– CONTINUED –
▼Disabling the TRAC System
If the vehicle gets stuck in mud, dirt or
snow, the TRAC system may reduce
power from the engine to the wheels.
Pressing the Vehicle Stability Control
(VSC) OFF switch to turn the system off
may make it easier for you to rock the
vehicle in order to free it. In this case, the
brake LSD function remains on. To turn
the TRAC system off, quickly press and
release the button. The TRAC OFF indi-
cator light will come on. Press the button
again to turn the system back on.
Creating adequate driving wheel slip by
deactivating the TRAC system may help
to recover from the loss of traction. Use
the Vehicle Stability Control (VSC) OFF
switch as necessary.
 A standing start on a steeply sloping
road with a snowy, gravel-covered, or
otherwise slippery surface
 Extrication of the vehicle when its
wheels are stuck in mud or deep snow ▼
Turning Off both Vehicle Stability
Control (VSC) and TRAC Systems
To turn the Vehicle Stability Control (VSC)
systems and TRAC system off, press and
hold the Vehicle Stability Control (VSC)
OFF switch for more than 3 seconds while
the vehicle is stopped. The TRAC OFF
indicator light and the Vehicle Stability
Control (VSC) OFF indicator light will
come on. However, on vehicles with an
automatic transmissi on, the brake LSD
function will remain on. Press the button
again to turn the systems back on. With
the Vehicle Stability Control (VSC) system
and TRAC system deactivated, traction
and stability enhancement offered by
Vehicle Stability Control (VSC) system
and TRAC system is unavailable. There-
fore you should not deactivate the Vehicle Stability Control (VSC) system and TRAC

system except under above-mentioned
situations.
NOTE When the switch has been pressed
to deactivate the Vehicle Stability
Control (VSC) system and TRAC
system, the Vehicle Stability Control
(VSC) system and TRAC system auto-
matically reactivates itself the next
time the ignition swit ch is turned to the
“OFF” position and the engine is
restarted.
 If the switch is held down for 30
seconds or longer, the indicator light
turns off, the Vehicle Stability Control
(VSC) system is activated, and the
system ignores any further pressing of
the switch. To make the switch usable
again, turn the ignition switch to the
“OFF” position and restart the engine.
 When the switch is pressed to deac-
tivate the Vehicle Stability Control
(VSC) system and TRAC system, the
vehicle’s running performance is
comparable with that of a vehicle that
does not have a Vehicle Stability
Control (VSC) system and TRAC
system. Do not deac tivate the Vehicle
Stability Control (VSC) system and
TRAC system except when absolutely
necessary.
702831
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Hill Start Assist System
259
Starting and Operating7
– CONTINUED –
NOTEIf you make an error when performing
any steps in the following procedure,
place the ignition switch in the “OFF”
position once and then start over
again.▼ To deactivate
1. Park your vehicle in a flat and safe
location and apply the parking brake.
2. Turn the ignition switch to the “OFF”
position.
3. Restart the engine. 4. Confirm the following items.
(1) The ABS warning light turns off.
(2) The brake system warning light
illuminates.
(3) The Vehicle Stability Control
(VSC) OFF indicator light turns off.
(4) TRAC OFF indicator light turns off.
5. Press and hold the Vehicle Stability
Control (VSC) OFF switch for 30 seconds
until the Vehicle Stability Control (VSC)
OFF indicator light on the combi-
nation meter turns on and off.
6. Within 5 seconds, release the Vehicle
Stability Control ( VSC) OFF switch.
7. Within 2 seconds, press back the
Vehicle Stability Control (VSC) OFF
switch. 
The Hill start assist i ndicator light turns on
and off. 8. Turn the ignition switch to the “OFF”

position. Hill start a ssist is deactivated.
NOTEWhen the Hill start assist system is
deactivated, the Hill start assist indica-
tor light turns off.
▼ To reactivate
To reactivate Hill start assist system,
repeat steps 1 to 8. When the Hill start
assist system is activa ted, the Hill start
assist indicator light illuminates.■ Hill Start Assist Indicator
LightRefer to "Hill Start A ssist Indicator Light"
 P150.
1 4
23
702784
702785
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BSD/RCTA (If Equipped)
274■BSD/RCTA Warning Indi -
cator▼ System malfunction1) BSD/RCTA malfunction message
2) BSD/RCTA warning indicatorThis display appears when a malfunction
occurs in the system. Contact a SUBARU
dealer and have the system inspected.
■ To Turn On/Off the BSD/
RCTABSD/RCTA OFF indicatorTo turn the BSD/RCTA system on and off,
operate the center information display.
Refer to "Car settings" P165.
When the BSD/RCTA system is turned
OFF, the BSD/RCTA OFF indicator on the
combination meter display (color TFT) will
illuminate.NOTE In the following cases, turn off the
BSD/RCTA system. The system may
not operate properly due to blocked
radar waves. - When a bicycle carrier or other
item is fitted to the rear of the
vehicle - When using a chassis dynamom-
eter or free roller device, etc.
- When running the engine and

making the wheels rotate while
lifting up the vehicle
 If the ignition switch is turned to the
“OFF” position, the last known status
of the system is maintained. For
example, if the ignition switch is turned
to the “OFF” position with the BSD/
RCTA deactivated, the BSD/RCTA
remains deactivated the next time the
ignition switch is turned to the “ON”
position.
■ Certification for the BSD/
RCTAThe U.S. and other FCC compliant
countries
FCC ID: OAYSRR3A
This device complies with part 15 of the
FCC Rules. Operation is subject to the
\b

\f
 


1
2
702879
702806
CAUTION
FCC WARNINGChanges or modifications not
expressly approved by the party
responsible for compliance could
void the user’s authority to operate
the equipment.
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Reverse Automatic Braking (RAB) System (If Equipped)
280
- The rear bumper is exposed to
strong impact, or the rear bumper is
deformed.
 On a steep hill, the system’s auto-
matic braking ability will be reduced.
 The system is designed to avoid
collisions by automatic hard braking
when the vehicle’s reversing speed is
less than approximately 3 mph (5 km/
h). However, the system does not guar-
antee that the vehicle will be able to
avoid collisions in any situation.
 If the vehicle is reversed at an
extremely slow speed, the driver’s
operation may be prioritized. In this
case, automatic braking will not
operate.
 The system may not be able to
detect and apply the brake with the
following objects. - Sharp or thin objects such as
poles, fences and ropes which may
not reflect the s ound wave emitted
from the sonar sensor.
- Objects that are too close to the
rear bumper when the select lever is
set to the “R” position.
- Objects with a surface which
may not reflect the sound wave
emitted from the sonar sensor such
as a chain link fence.
 Objects the system is not designed
to detect and apply brake. -Pedestrians.
- Moving objects including

moving vehicles.
- Objects which absorbs sound
waves such as cloth or snow.
- Objects whose surface has a
diagonal angle.
- Objects that are low to the
ground such as parking blocks.
- Objects that are high above the
ground such as objects hanging
from above.
- Objects that are out of range of
the center of the vehicle in the hori-
zontal direction.
- Objects that are not perpendic-
ular to the ground.
- The surface of the object is
uneven or wavy.
 When reversing the vehicle, the
functions may not be able to work
properly or may cause a system
malfunction if the following conditions
exist.
High frequency sound from other
sources are nearby:
- Horn sound from another
vehicle.
- Engine sound from other vehi-
cles.
- Sound of an air brake.
- Vehicle detection equipment or a
sonar from another vehicle. - A sound wave with a frequency

similar to the vehicle’s system is
transmitted near by.
- A vehicle equipped with the
same system is reversing toward
your reversing direction.
Weather conditions:
- Extremely high or extremely low
temperatures in which the area near
the sonar sensor becomes too hot
or too cold to operate.
- The sonar sensors or the rear
bumper near the sonar sensors are
exposed to heavy rain or a signifi-
cant amount of water.
- Fog, snow or sandstorm, etc.
- Air is moving rapidly such as
when a strong wind is blowing.
Parts attached to the rear bumper
near the sonar sensor:
- Commercial electr onic parts (fog
light, fender pole, radio antenna) or
commercial attachment parts (trailer
hitch, bicycle carrier, bumper guard)
are attached.
- Parts that emit high frequency
sound, such as a horn or speaker,
are attached.
Vehicle conditions:
- Ice, snow or mud is adhered to
the sonar sensors or the rear
bumper near the sonar sensor.
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Winter Driving
293
Driving Tips8
– CONTINUED –
8-8. Winter Driving■Operation during Cold
WeatherCarry some emergency equipment, such
as a window scraper, a bag of sand,
flares, a small shovel and jumper cables.
Check the battery and cables. Cold
temperatures reduce battery capacity.
The battery must be in good condition to
provide enough power for cold winter
starts.
It normally takes longer to start the engine
in very cold weather conditions. Use an
engine oil of a proper grade and viscosity
for cold weather. Using heavy summer oil
will make it harder to start the engine.
Keep the door locks from freezing by
squirting them with deicer or glycerin.
Forcing a frozen door open may damage
or separate the rubber weather strips
around the door. If the door is frozen, use
hot water to melt the ice, and afterwards
thoroughly wipe the water away.
Use a windshield washer fluid that
contains an antifr eeze solution. Do not
use engine antifreeze or other substitutes
because they may damage the paint of
the vehicle.
If you fill the windshield washer tank with
a fluid with a different concentration from
If all four tires are not the same in
items (a) to (h), serious mechani-
cal damage could be caused to
the drivetrain of the car, and
affect the followings.-Ride-Handling- Braking- Speedometer/Odometer cali-
bration- Clearance between the body
and the tires
It also may be dangerous and
lead to loss of vehicle control,
and it can lead to an accident.
 In a rollover crash, an unbelted
person is significantly more likely
to die than a person wearing a
seat belt. The driver and all your
passengers should fasten their
seatbelts before st arting to drive
in order to minimize the chance of
serious injury or death. Do not make sharp turns or quick
maneuvers unless absolutely
unavoidable. Such actions are
dangerous as you may lose
control, possibly resulting in a
rollover which could cause death
or serious injury.
 Whenever strong crosswinds are
present, slow do wn sufficiently to
maintain control of your vehicle. Never to drive through pools and
puddles, or roads flooded with
water. Water entering the engine
air intake or the exhaust pipe or
water splashing onto electrical
parts may damage your vehicle
and may cause it to stall. In this
case, contact your SUBARU
dealer immediat ely. Regardless
of its depth, it can wash away the
ground from under your tires,
resulting in possible loss of trac-
tion and even vehicle rollover.
CAUTION
After driving on gravel roads or
rough roads, check the undercar-
riage of the vehicle body for any
damage, deformation, or paint
removal. If you notice any irregulari-
ties, contact a SUBARU dealer for
an inspection as soon as possible.
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Winter Driving
294the one used previously, purge the old
fluid from the piping between the wind-
shield washer tank and washer nozzles by
operating the washer for a certain period
of time. Otherwise, if the concentration of
the fluid remaining in the piping is too low
for the outside temperature, it may freeze
and block the nozzles.
▼ Before driving your vehicle
Before entering the vehicle, remove any
snow or ice from your shoes because that
could make the pedals slippery and
driving dangerous.
While warming up the vehicle before
driving, check that the accelerator pedal,
brake pedal, and all other controls operate
smoothly.
Clear away ice and snow that has accu-
mulated under the fenders to avoid
making steering difficult. During severe
winter driving, stop when and where it is
safe to do so and check under the fenders
periodically.
▼ Parking in cold weather
CAUTION
Adjust the washer fluid concen-
tration appropriately for the
outside temperature. If the
concentration is inappropriate,
sprayed washer fluid may freeze
on the windshield and obstruct
your view, and the fluid may
freeze in the windshield washer
tank. State or local regulations on vola-
tile organic compounds may
restrict the use of methanol, a
common windshield washer anti-
freeze additive. Washer fluids
containing non-methanol anti-
freeze agents should be used
only if they provide cold weather
protection without damaging
your vehicle’s paint, wiper blades
or washer system.
WARNING
Snow can trap dangerous exhaust
gases under your vehicle. Keep
snow clear of the exhaust pipe and
from around your vehicle if you
park the vehicle in snow with the
engine running.
CAUTION
 Do not use the parking brake
when parking for long periods in
cold weather since it could freeze
in that position. When the vehicle is parked in
snow or when it snows, raise the
wiper blades off the glass to
prevent damage to them. Under either of the following
conditions, icing may develop on
the brake system, which could
cause poor braking action.
- When the vehicle has been left
parked after use on roads
heavily covered with snow- When the vehicle has been left
parked during a snowstormCheck for snow or ice buildup on
the suspension, disc brakes and
brake hoses underneath the vehi-
cle. If there is caked snow or ice,
remove it, being careful not to
damage the disc brakes and
brake hoses and ABS harness.
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Winter Driving
295
Driving Tips8
– CONTINUED –
When parking for long periods in cold
weather, you should observe the following
tips.
1. For MT models, place the shift lever in
the “1” or “R” position. For AT models,
place the select lever in the “P” position.
2. Use tire stops under the tires to
prevent the vehicle from moving.▼ Refueling in cold weather
To help prevent moisture from forming in
the fuel system and t he risk of its freezing,
use of an antifreeze additive in the fuel
tank is recommended during cold
weather.
Use only additives that are specifically
designed for this purpose. When an anti-
freeze additive is used, its effect lasts
longer if the tank is refilled whenever the
fuel level reaches half empty.
If your SUBARU is not going to be used for
an extended period, it is best to have the
fuel tank filled to capacity.
■ Driving on Snowy and Icy
RoadsTo prevent skidding and slipping, avoid
sudden braking, abrupt acceleration, high-
speed driving, and sharp turning when
driving on snowy or icy roads.
Always maintain ample distance between
your vehicle and the vehicle ahead of you
to avoid the need for sudden braking.
To supplement the foot brake, use the
engine brake effectively to control the
vehicle speed. (Shift into a lower gear
when necessary.) Avoid shifting down abruptly. Such

behavior can cause the wheels to lock,
possibly leading to loss of vehicle control.
An anti-lock brake system (ABS)
enhances your vehicle’s braking perfor-
mance on snowy and icy roads. For infor-
mation about braking on slippery
surfaces, refer to "ABS (Anti-Lock Brake
System)" P245 and "Vehicle Stability
Control (VSC)/TRAC System" P247.
For AT models, use the Snow mode when
driving on snowy or icy roads. For details
about how to use the mode, refer to
"Driving Mode Select Switch (If
Equipped)" P241.
▼ Wiper operation when snowing
Before driving in cold weather, make sure
the wiper blade rubbers are not frozen to
the windshield.
If the wiper blade rubbers are frozen to the
windshield, use the defroster with the
airflow selection in “ ” and the tempera-
ture set for maximum warmth until the
wiper blade rubbers are completely
thawed. Refer to "Cli mate Control Panel"
 P198.
Snow stuck on the wiper arm prevents the
wiper from working effectively. If snow is
stuck on the wiper arm, pull off the road to
a safe place, then remove it. If you stop
the vehicle at road side, use the hazard
WARNING
Do not use the cruise control on
slippery roads such as snowy or icy
roads. This may cause loss of vehi-
cle control.
CAUTION
Avoid prolonged continuous driving
in snowstorms. Snow will enter the
engine’s intake system and may
hinder the airflow, which could
result in engine shutdown or even
breakdown.
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Differential Gear Oil
353
Maintenance and Service11
– CONTINUED –
11-12. Differential Gear OilIt is not necessary to check the gear oil
level. Check that there are no cracks,
damage or leakage. However, the oil
inspection should be performed according
to the maintenance schedule in the
“Warranty and Maintenance Booklet”.
Consult your SUBARU dealer for details.■ Recommended Grade and
ViscosityEach oil manufacturer has its own base
oils and additives. Never use different
brands together. For details, refer to
"Manual Transmission and Differential
Gear Oil" P383.
11-13. Manual Transmission OilIt is not necessary to check the transmis-
sion oil level. Check that there are no
cracks, damage or leakage. However,
have the oil inspected by your SUBARU
dealer according to the maintenance
schedule in the “Warranty and Mainte-
nance Booklet”. Consult your SUBARU
dealer for details.■ Recommended Grade and
ViscosityEach oil manufacturer has its own base
oils and additives. Never use different
brands together. For details, refer to
"Manual Transmission and Differential
Gear Oil" P383.
11-14. Brake Fluid■ Checking the Fluid Level
CAUTION
Using a differential gear oil other
than the specified oil may cause a
decline in vehicle performance.
WARNING
 Never let brake fluid contact your
eyes because brake fluid can be
harmful to your eyes. If brake
fluid gets in your eyes, immedi-
ately flush them thoroughly with
clean water. Fo r safety, when
performing this work, wearing
eye protection is advisable. Brake fluid absorbs moisture
from the air. Any absorbed mois-
ture can cause a dangerous loss
of braking performance. If the vehicle requires frequent
refilling, there may be a leak. If
you suspect a problem, have the
vehicle checked at your SUBARU
dealer.
CAUTION
 When adding brake fluid, be
careful not to allow any dirt into
the reservoir. Never splash the brake fluid over
painted surfaces or rubber parts.
Alcohol contained in the brake
fluid may damage them.
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Clutch Fluid (MT models)
354Visually check the brake fluid level of the
reservoir monthly on the even surface.1) “MAX” level line
2) “MIN” level lineBe sure to check the brake fluid level from
the outside of the reservoir. If the fluid
level is below “MIN”, top up brake fluid to
“MAX”. Use only brake fluid from a sealed
container.
■ Recommended Brake FluidRefer to "Fluids" P383.
11-15. Clutch Fluid (MT models)■ Checking the Fluid Level
Be careful not to spill brake fluid
when adding it. If brake fluid
touches the exhaust pipe, it may
cause a bad smell, smoke, and/or
a fire. If brake fluid gets on the
exhaust pipe, be sure to wipe it
off.
12
B02107
CAUTION
Never use different brands of brake
fluid together. Also, avoid mixing
DOT 3 and DOT 4 brake fluids even
if they are the same brand.
WARNING
Never let clutch fluid contact your
eyes because clutch fluid can be
harmful to your eyes. If clutch fluid
gets in your eyes, immediately flush
them thoroughly with clean water.
For safety, when performing this
work, wearing eye protection is
advisable.
CAUTION
 Clutch fluid absorbs moisture
from the air. Any absorbed mois-
ture can cause improper clutch
operation. If the vehicle requires frequent
refilling, there may be a leak. If
you suspect a problem, have the
vehicle checked at your SUBARU
dealer. When you add clutch fluid, be
careful not to allow any dirt into
the tank.
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