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EnglishStarting and operating -> Reverse Automatic Braking for your Subaru Forester 2019-2024
Reverse Automatic Braking (RAB) system
368
be delayed or may not operate at
all even when an obstacle is
present.
guard) is installed on the rear of
the vehicle, turn off the Reverse
Automatic Braking (RAB). If this
function is on when an attach-
ment or a similar part is installed,
it may result in a system malfunc-
tion that causes an accident
resulting in serious damage, in-
jury or death.
7-20. Reverse Automatic
Braking (RAB) system (if
equipped)
.
.
The system is not designed to
detect people (including chil-
dren), animals or other moving
objects.
Reverse Automatic Braking (RAB) is a
system designed to help avoid collisions or
reduce collision damage when reversing
the vehicle. If a wall or an obstacle is
detected in the reversing direction, the
system will notify the driver with a warning
sound and may activate the vehicle’s
brakes automatically.
Depending on the vehicle condi-
tion or the surrounding environ-
ment, the sonar sensor’s ability
to detect objects may be compro-
mised.
NOTE
The Reverse Automatic Braking (RAB)
system records and stores the follow-
ing data when automatic braking oper-
ates. It does not record conversations,
personal information or other audio
data.
.
Do not remove the SUBARU gen-
uine navigation and/or audio sys-
tem. If the SUBARU genuine
navigation and/or audio system
is removed, the rear view camera
image and help lines (distance
marker, dynamic guidelines and
vehicle width lines) will no longer
be displayed.
WARNING
.
Reverse Automatic Braking
(RAB) is not a system intended
to replace the driver’s responsi-
bility to check surrounding areas
for vehicles or obstacles to avoid
a collision.
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Distance from the object
Vehicle speed
Accelerator pedal operation status
Brake pedal operation status
Select lever position
Outside temperature
The sensitivity setting of the sonar
sensors
.
.
The driver is responsible for driv-
ing safely. Before reversing, be
sure to first depress the brake
pedal and visually check the
surroundings.
.
.
Even if the Reverse Automatic
Braking (RAB) system and object
detection warning is ON, the
visible alert of Reverse Auto-
matic Braking (RAB) system will
not be displayed. However, the
audible alert and its function will
operate.
SUBARU and third parties contracted
by SUBARU may acquire and use the
recorded data for the purpose of vehi-
cle research and development.
SUBARU and third parties contracted
by SUBARU will not disclose or provide
There are some cases in which
the vehicle cannot avoid colli-
sion, because the system opera-
tion has limitations. The warning
sound or automatic braking may
When an attachment part (trailer
hitch, bicycle carrier, bumper
Reverse Automatic Braking (RAB) system 369
the acquired data to any other third
party except under the following con-
ditions.
.
The vehicle owner has given his/her
consent.
.
The disclosure/provision is based
on a court order or other legally
enforceable request.
.
Data that has been modified so that
the user and vehicle cannot be
identified is provided to a research
institution for statistical processing
or similar purposes.
& Reverse Automatic Braking
(RAB) system overview
The system detects objects using sonar
sensors installed in the rear bumper.
.
If the system determines a possible
collision with an object in the reversing
direction, automatic deceleration will be
activated. Also, beeping sounds will
activate.
.
If the vehicle is further reversed, auto-
matic hard braking will be applied and a
continuous beeping sound will activate.
1
2
When reversing
3
4
When the vehicle is stopped by the
system (in this case, the continuous
beep will remain sounding)
When either strong automatic braking or
torque control is applied to prevent
collision (in this case, short warning
beeps or continuous warning beeps will
sound)
Object (e.g., a wall)
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Reverse Automatic Braking (RAB) system
370
system is set to on.
The select lever is in the “R” position.
The vehicle speed is between 1 to 9
mph (1.5 to 15 km/h).
cancel the system, refer to “Cancel-
ing the Reverse Automatic Braking
(RAB) system operation” �P376.
! Detecting range
.
.
NOTE
& Operating conditions
The Reverse Automatic Braking (RAB)
system will operate when all of the follow-
ing conditions are met.
.
In the following cases, the Reverse
Automatic Braking (RAB) system
will not operate. Promptly contact a
SUBARU dealer to have the system
inspected.
– The EyeSight warning indicator
is illuminated.
– The RAB warning indicator is
illuminated.
When the RAB OFF indicator is
illuminated, the Reverse Automatic
Braking (RAB) system cannot be
operated.
1
2
Detecting range (width): Approximately 6
in (15 cm) outside of the vehicle width
.
.
Range that the system cannot detect:
Approximately 20 in (50 cm) behind the
rear of the vehicle
Detecting range (length): Approximately
5 ft (1.5 m) from the rear of the vehicle
3
In the following cases, the system
may not be able to properly detect an
obstacle. Promptly contact
SUBARU dealer to have the system
inspected.
– A sticker, paint, or a chemical is
applied to the sonar sensor or the
rear bumper near the sonar sen-
sor.
– The rear bumper is modified.
– The rear bumper has been re-
moved and reattached.
a
WARNING
1
2
3
EyeSight warning indicator
RAB warning indicator
RAB OFF indicator
If your vehicle is trapped on a rail-
road crossing and you are trying to
escape by reversing through the
crossing gate, the system may re-
cognize the crossing gate as an
obstacle and the brake may activate.
In this case, remain calm and either
continue to depress the accelerator
pedal or cancel the system. To
.
The ignition switch is in the “ON”
position.
The EyeSight warning indicator is off.
The RAB warning indicator is off.
The RAB OFF indicator is off.
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The Reverse Automatic Braking (RAB)
Reverse Automatic Braking (RAB) system 371
– The ground clearance is changed
due to the vehicle’s loading con-
dition or modification.
– Ice, snow or mud is adhered to
the rear bumper near the sonar
sensor.
– The rear bumper is exposed to
strong impact, or the rear bumper
is deformed.
When the 8-inch audio/navigation
system is performing a software
update, the Reverse Automatic
Braking (RAB) system may not dis-
play the following items on the
audio/navigation screen until the
update is complete.
case, automatic braking will not
operate.
The system may not be able to detect
the following objects.
– Objects that are not perpendicu-
lar to the ground.
– The surface of the object is
uneven or wavy.
The system may not be able to
properly detect objects or may
cause a system malfunction when
the following conditions exist.
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– Sharp or thin objects such as
poles, fences and ropes which
may not reflect the sound 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.
– Pedestrians
– Moving objects including moving
vehicles
– Objects which absorb 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.
.
High frequency sound from other
sources are nearby:
– Horn sounds from other vehicles.
– Engine sounds from other vehi-
cles.
.
– Sounds of air brakes
– Vehicle detection equipment or a
sonar from other vehicles
– A sound wave with a frequency
similar to the vehicle’s system is
transmitted nearby.
– A vehicle equipped with the same
system is reversing toward your
reversing direction.
.
– Display Icon on/off Function
– Distance Indicator Image
– Warning Message
.
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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
guarantee that the vehicle will be
able to avoid collisions in any situa-
tion.
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 is
exposed to heavy rain or a sig-
– 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
horizontal direction.
.
If the vehicle is reversed at an
extremely slow speed, the driver’s
operation may be prioritized. In this
– CONTINUED –
Reverse Automatic Braking (RAB) system
372
nificant amount of water.
the vehicle such as narrow tun-
nels, narrow bridges, narrow
roads or narrow garages.
– Fog, snow or sandstorm, etc.
– Air is moving rapidly such as
when a strong wind is blowing.
– Wheel tracks or a hole is present
in the ground of the reversing
direction.
– When reversing over a drainage
cover (grate cover).
Parts attached to the rear bumper
near the sonar sensor:
– Commercial electronic parts (fog
light, fender pole, radio antenna)
are attached.
– Parts that emit high frequency
sound, such as a horn or speaker,
are attached.
– The path of the reversing direc-
tion is inclined such as on a steep
uphill.
– A curb is present in the reversing
direction.
Vehicle conditions:
– The vehicle is significantly in-
clined.
– The ground clearance is signifi-
cantly reduced due to the vehi-
cle’s loading condition, etc.
– When the sonar sensor is mis-
aligned due to a collision or an
accident.
– When reversing downhill.
Surrounding environment:
– A cloth banner, flag, hanging
branch or railroad crossing bars
are present in the reversing di-
rection.
– When reversing on a gravel or
grassy area.
– When reversing in an area where
objects or walls are adjacent to
Reverse Automatic Braking (RAB) system 373
– When reversing on an uneven
road.
& Reverse Automatic Braking
(RAB) system operation
When the Reverse Automatic Braking
(RAB) system is in operation, the range
between the vehicle and the detected
object will be indicated on the audio/
navigation monitor. Also, warning sounds
will activate in 3 levels to warn the driver of
a potential collision.
While the RAB is operating, a warning
message is displayed on the audio/navi-
gation monitor and the combination meter
display (color LCD).
.
In circumstances such as the follow-
ing, it may not be possible to avoid a
collision even when the system
operates normally.
– The roads are slippery.
– The tire air pressure is not cor-
rect.
– The tires have become worn.
– Tires which are not the desig-
nated size are installed.
– Emergency repairs were per-
formed using a puncture repair
kit.
– The suspension was modified.
– Tire chains are installed.
– Vehicle driving is unstable due to
accident or malfunction.
– The brake warning light is illumi-
nated.
– CONTINUED –
Reverse Automatic Braking (RAB) system
374
Guideline of detecting range
! Obstacle detected and alert level
Alert level
Range of detected object*
Distance indicator
Alarm pattern
Long proximity alert
(object detected)
43 to 59 in (110 to 150 cm) Green
No warning sound
Medium proximity
alert (approaching the 28 to 43 in (70 to 110 cm) Yellow
object)
Short beeps
Short proximity alert
(approaching closer
to the object)
20 to 28 in (50 to 70 cm)
Orange
Red
Rapid short beeps
Continuous beep
Closest proximity
alert (too close to the 20 in (50 cm) or less
object)
*: Range of detection may vary depending on the environmental condition.
Long proximity alert (object detected)
1
Green: 43 to 59 in (110 to 150 cm)
Medium proximity alert (approaching the
object)
1
Yellow: 28 to 43 in (70 to 110 cm)
Reverse Automatic Braking (RAB) system 375
When an object is detected in the rever-
sing direction, the range of detected object
will be shown on the audio/navigation
monitor.
A warning alarm will sound and, depend-
ing on the speed, either torque control to
generate engine braking or automatic
braking will be applied.
! Object close behind warning
Short proximity alert (approaching the
object closer)
Depress brake pedal warning
1
Warning message
1
Orange: 20 to 28 in (50 to 70 cm)
Make sure to depress the brake pedal
once the vehicle has been stopped by
automatic braking. Until the brake pedal is
depressed, a message will be displayed
on the audio/navigation monitor and the
continuous beep will remain sounding.
At this time, a warning message is also
displayed on the combination meter dis-
play (color LCD).
Automatic braking warning
1
Warning message
If the vehicle continues to go in reverse,
the system may determine the risk of
collision with the object. In this case, short
warning beeps or continuous warning
beeps will sound and either strong auto-
matic braking or torque control will be
applied to prevent collision.
NOTE
The Sonar Audible Alarm function and
Automatic Braking function are differ-
ent operation conditions. Therefore,
there are cases in which only one of
these functions will activate.
Closest proximity alert (too close to the
object)
1
Red: 20 in (50 cm) or less
– CONTINUED –
Reverse Automatic Braking (RAB) system
376
than the “R” position.
– When the EyeSight system mal-
functions.
– When the Reverse Automatic
Braking (RAB) system stops tem-
porarily.
The message/warning message will
not display for approximately 8 sec-
onds after turning the ignition
switch to the “ON” position.
WARNING
The system will operate again the next
time the select lever is shifted to “R”
position.
In circumstances such as the following, the
Reverse Automatic Braking (RAB) system
automatically stops operating and the RAB
OFF indicator illuminates.
Depress the brake pedal immedi-
ately after the system stops the
vehicle by automatic braking. De-
pending on the conditions of the
road surface and tires, the vehicle
may not remain stopped, possibly
leading to an unexpected accident.
.
–
There is ice, snow, mud, or other
substance on the sonar sensors.
! After the vehicle is stopped by the
–
The select lever was shifted to “R” & Canceling the Reverse Auto-
system
when there is an obstacle located close
matic Braking (RAB) system
to the rear bumper.
operation
–
–
A sound with a frequency close to that
The Reverse Automatic Braking (RAB)
of the sonar used by the Reverse
system can be temporarily canceled by
Automatic Braking (RAB) system was
any of the following operations.
detected.
.
.
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Depressing the brake pedal*
Depressing the accelerator pedal*
The Vehicle Dynamics Control OFF
mode is selected.
The accelerator pedal is kept de-
pressed. (In this case, limited accelera-
tion will be canceled and the vehicle will
continue reversing.)
The select lever is shifted to a position
other than the “R” position.
NOTE
.
In the following cases, after the
vehicle has been stopped by the
Reverse Automatic Braking (RAB)
system, brake control is released
and the electronic parking brake
operates. For details about releasing
the parking brake, refer to “Electro-
nic parking brake” �P345.
.
1
RAB OFF indicator
*: While the vehicle is stopped by the automatic
braking
After the brake pedal is depressed, the
RAB OFF indicator will illuminate and the
system will temporarily stop operating.
The RAB OFF indicator will turn off when
the select lever is shifted to a position other
NOTE
– When 2 minutes pass after the
vehicle is stopped.
The system will be canceled if the
object is no longer detected.
– When any door is opened.
Reverse Automatic Braking (RAB) system 377
When the OFF setting is shown, the
corresponding setting is OFF.
Touch and hold the OFF setting key to turn
the setting ON.
& Reverse Automatic Braking
NOTE
(RAB) system ON/OFF setting
.
When the settings cannot be chan-
ged, the ON/OFF setting key will be
grayed out.
While the select lever is shifted to the “R”
position, the below functions of the Re-
verse Automatic Braking (RAB) system
can be set by operating the audio/naviga-
tion monitor.
.
The ON/OFF setting key may be
grayed out if the Reverse Automatic
Braking (RAB) system malfunctions,
etc. In this case, turn the ignition
switch to the “OFF” position and
then turn it to the “ON” position
again. If the setting cannot be chan-
ged even after turning the ignition
switch to the “ON” position again,
consult your SUBARU dealer.
When the Reverse Automatic Braking
(RAB) system is turned OFF, the following
indicator will illuminate.
.
As soon as you turn off the ignition
switch, the Reverse Automatic Brak-
ing (RAB) ON/OFF setting is stored
in the system. Therefore, when you
turn the ignition switch from the
“OFF” state to the “ON” position,
the Reverse Automatic Braking
(RAB) setting will revert to the state
that was set before the ignition
switch was turned off.
1
2
3
4
ON setting key of Reverse Automatic
Braking (RAB) system
OFF setting key of Reverse Automatic
Braking (RAB) system
ON setting key of the object detection
warning beeping sound
OFF setting key of the object detection
warning beeping sound
RAB OFF indicator: illuminates when the
Reverse Automatic Braking (RAB) system is
turned OFF.
RAB OFF indicator will turn off when the
Reverse Automatic Braking (RAB) system
is turned ON.
.
When you turn the ignition switch
off, the Sonar Audible Alarm ON/OFF
settings will always reset, and the
system will not store the settings of
the function. Therefore, every time
you turn the ignition switch to the
“ON” position, the Sonar Audible
Alarm will turn on automatically.
When the ON setting key is shown, the
corresponding setting is ON.
Touch and hold the ON setting key to turn
the setting OFF.
– CONTINUED –
Reverse Automatic Braking (RAB) system
378
Also, the following settings can be chan-
ged by operating the combination meter
display (color LCD).
.
.
Do not apply strong impacts to the rear
bumper near the sonar sensors. If a
sensor becomes misaligned, a system
malfunction may occur, including in-
ability to detect objects in the reversing
direction. If any strong impact is applied
to the rear bumper, contact a SUBARU
dealer to have the system inspected.
& Handling of the sonar sen-
sors
The 4 sonar sensors are located in the rear
bumper. To ensure the proper operation of
the Reverse Automatic Braking (RAB)
system, observe the following precau-
tions.
.
.
Warning volume
Sonar Audible Alarm ON/OFF
For details, refer to “Menu screens”
�P199.
Do not disassemble the sonar sensors.
& RAB warning indicator
NOTE
If the sonar sensors require repair or
replacement, or if the area of the rear
bumper near the sonar sensors re-
quires repair, paintwork or replace-
ment, contact your SUBARU dealer for
assistance.
.
.
Do not affix any stickers or other items
on the sonar sensor or the bumper
surface near the sonar sensors.
Always keep the rear bumper surface
near the sonar sensors clean.
1
2
RAB malfunction message
RAB warning indicator
If the Reverse Automatic Braking (RAB)
system malfunctions, the above indicator
illuminates on the combination meter.
Contact the nearest SUBARU dealer for
details.
.
.
Do not modify the rear bumper.
Do not paint the bumper near the sonar
sensors.
Do not apply high pressure water to the
sonar sensors with a high pressure
carwashing machine.
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