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with a low body height such as
sports cars or a trailer with no
cargo)
– Vehicles that are not approaching
your vehicle even though they are in
the detection area (either on a
neighboring lane to the rear or be-
side your vehicle when reversing)
(The system determines the pre-
sence of approaching vehicles
based on data detected by the radar
sensors.)
– Vehicles traveling at significantly
different speeds
– Vehicles driving in parallel at al-
most the same speed as your vehi-
cle for a prolonged time
– Oncoming vehicles
– Vehicles in a lane beyond the
neighboring lane
– Vehicles travelling at a signifi-
cantly lower speed that you are
trying to overtake

On a road with extremely narrow

lanes, the system may detect vehicles
driving in a lane next to the neighboring
lane.
.

When the 8-inch audio/navigation

system is performing a software up-
date, the RCTA warning icons may not
be displayed on the audio/navigation
screen until the update is complete.

BSD/RCTA approach indica-
tor light/warning buzzer

When the BSD/RCTA is active, the BSD/
RCTA approach indicator light will operate
to alert the driver when there are vehicles
in the neighboring lanes. When reversing
the vehicle, the BSD/RCTA approach
indicator light and warning buzzer will
operate to alert the driver that a vehicle is
approaching from the left or right side.

BSD/RCTA approach indicator light

It is mounted in each side of the outside
mirrors.
The indicator light will illuminate when a
vehicle approaching from behind is de-
tected.
The indicator light will flash to warn the

driver of dangers under the following
conditions.
.

While the indicator light illuminates, if

you operate the turn signal lever toward
the side in which this light turned on.
.

When reversing the vehicle while the

system detects a vehicle approaching
from either side.

BSD/RCTA approach indicator
light dimming function

When the headlights are turned on, the
brightness of the BSD/RCTA approach
indicator light will be reduced.

NOTE

You may have difficulty recognizing

the BSD/RCTA approach indicator light
under the following conditions.

– When affected by direct sunlight
– When affected by the headlight
beams from the vehicles behind

While the illumination brightness

control dial is in the fully upward
position, even if the headlights are
turned on, the brightness of the BSD/
RCTA approach indicator light will not
be reduced. For details about the
illumination brightness control dial,
refer to “Illumination brightness con-
trol” F3-12.

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BSD/RCTA approach warning buz-
zer (only when reversing)

A warning buzzer sounds along with
flashing of the BSD/RCTA approach in-
dicator light to warn the driver of dangers.

The setting of the warning buzzer volume
can be changed by operating the combi-
nation meter display (color LCD). For
details, refer to “Menu screens” F3-39.

Safety tips regarding the BSD/RCTA
approach indicator light/warning
buzzer

In the following cases, operation of the

BSD/RCTA approach indicator light and
the warning buzzer may be delayed or the
system may fail to issue these warnings.

– When a vehicle moves to the neigh-
boring lane from a lane next to the
neighboring lane
– When driving on a steep incline or
on repeated sharp uphill and downhill
grades
– When going beyond a pass
– When both your vehicle and a
vehicle driving on a neighboring lane
are driving on the far side of each lane.
– When several narrowly-spaced ve-
hicles are approaching in a row
– In low radius bends (tight bends or
when making turns at an intersection)

– When there is a difference in height
between your lane and the neighboring
lane
– Immediately after the BSD/RCTA is
activated by pressing the BSD/RCTA
OFF switch
– Immediately after the shift lever/
select lever is shifted to the “R” position
– When extremely heavy cargo is
loaded in the trunk or cargo area

During reversing, operation of the BSD/

RCTA approach indicator light and the
warning buzzer may be delayed or the
system may fail to issue these warnings
under the following conditions.

– When backing out of an angled
parking space
– When a large-sized vehicle is
parked next to your vehicle (That
vehicle prevents the propagation of
radar waves.)
– When reversing on sloped roads
– When reversing at a high speed

The BSD/RCTA approach indicator

light may illuminate when driving close to
solid objects on the road or road side (such
as guardrails, tunnels and sidewalls).
.

The BSD/RCTA approach indicator

light may flash when turning at an inter-
section in urban areas or a multilane
intersection.
.

The BSD/RCTA approach indicator

light may flash and the warning buzzer
may sound if a building or a wall exists in
the reversing direction.
.

In the following cases, the system may

detect a vehicle driving two lanes away
from your vehicle.

– When you are driving on the near
side of its lane from the corresponding
vehicle

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– When the vehicle driving two lanes
away is driving on the near side of its
lane from your vehicle

BSD/RCTA OFF indicator

System temporary stops

BSD/RCTA temporary stop message

BSD/RCTA OFF indicator

This display appears when the system is
used under the following conditions.
.

Extremely high or low temperatures

When abnormal voltage exists for the

vehicle battery
.

When the radar sensor is significantly

misaligned

Once the above conditions are corrected,
the system will recover from the temporary

stop condition and the indicator will dis-
appear. If the indicator remains displayed
for a prolonged time, have the system
inspected at a SUBARU dealer.

System temporary stops due to
reduced radar sensitivity

BSD/RCTA temporary stop message due
to reduced radar sensitivity

BSD/RCTA OFF indicator

This display appears when the detectabil-
ity of the radar sensors is reduced. Once
the condition is corrected, the system will
recover from the temporary stop condition
and the indicator will disappear. If the
indicator remains displayed for a pro-
longed time, have the system inspected
at a SUBARU dealer.

BSD/RCTA warning indicator

System malfunction

BSD/RCTA malfunction message

At first, this message will appear

Then this message will appear

BSD/RCTA warning indicator

This display appears when a malfunction
occurs in the system. Contact a SUBARU
dealer and have the system inspected.

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BSD/RCTA OFF switch

BSD/RCTA OFF indicator (type A)

BSD/RCTA OFF indicator (type B)

If the BSD/RCTA OFF switch is pressed,
the BSD/RCTA OFF indicator appears on
the combination meter, and the BSD/
RCTA is deactivated.
Press the switch again to activate the BSD/
RCTA. The BSD/RCTA OFF indicator will
disappear.
When this occurs, the BSD/RCTA ap-
proach indicator light on the side of the
rearview mirror illuminates for a few
seconds and then turns off.

NOTE

In the following cases, the system

may not operate properly due to
blocked radar waves. Press the BSD/
RCTA OFF switch to deactivate the
system.

– When a bicycle carrier or other
item is fitted to the rear of the
vehicle
– When using a chassis dynam-
ometer 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

“LOCK”/“OFF” position, the last known
status of the system is maintained. For
example, if the ignition switch is turned
to the “LOCK”/“OFF” position with the
BSD/RCTA deactivated, the BSD/RCTA
will remain deactivated the next time
the ignition switch is turned to the “ON”
position.

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Certification for the BSD/
RCTA

U.S.-spec. models

FCC ID: OAYSRR3A

CAUTION

FCC WARNING

Changes or modifications not ex-
pressly approved by the party re-
sponsible for compliance could void
the user’s authority to operate the
equipment.

This device complies with part 15 of the
FCC Rules. Operation is subject to the
following two conditions: (1) This de-
vice may not cause harmful interfer-
ence, and (2) this device must accept
any interference received, including
interference that may cause undesired
operation.

Canada-spec. models

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Mexico-spec. models

Handling of radar sensors

Radar sensors (sedan)

Radar sensors (5-door models)

The radar sensors, one on each side of the
vehicle, are mounted inside the rear
bumper.
To ensure correct operation of the BSD/
RCTA, observe the following precautions.
.

Always keep the bumper surface near

the radar sensors clean.
.

Do not affix any stickers or other items

on the bumper surface near the radar
sensors.
.

Do not modify the bumper near the

radar sensors.
.

Do not paint the bumper near the radar

sensors.
.

Do not expose the bumper near the

radar sensors to strong impacts. If a
sensor becomes misaligned, a system
malfunction may occur, including the in-
ability to detect vehicles entering the
detection areas. If any strong shock is
applied to the bumper, be sure to contact
your SUBARU dealer for inspection.
.

Do not disassemble the radar sensors.

NOTE

If the radar sensors require repair or
replacement, or the bumper area
around the radar sensors requires
repair, paintwork or replacement, con-
tact your SUBARU dealer for assis-
tance.

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Reverse Automatic Braking
System (if equipped)

Reverse Automatic Braking 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 auto-
matically.

WARNING

Reverse Automatic Braking is not

a system intended to replace the
driver’s responsibility to check
surrounding areas for vehicles or
obstacles to avoid a collision.

The driver is responsible for driv-

ing safely. Always be sure to
check the surroundings visually
when reversing the vehicle.

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
be delayed or may not operate at
all even when an obstacle is
present.

The system is not designed to

detect people (including chil-
dren), animals or other moving
objects.

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 Sys-
tem records and stores the following
data when automatic braking operates.
It does not record conversations, per-
sonal information or other audio data.
.

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

SUBARU and third parties contracted
by SUBARU may acquire and use the
recorded data for the purpose of vehi-
c l e r e s e a r c h a n d d e v e l o p m e n t .
SUBARU and third parties contracted
by SUBARU will not disclose or provide

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 en-
forceable request.
.

Data that has been modified so that

the user and vehicle cannot be identi-
fied is provided to a research institution
for statistical processing or similar
purposes.

Reverse Automatic Braking
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 acti-
vate.
.

If the vehicle is further reversed, auto-

matic hard braking will be applied and a
continuous beeping sound will activate.

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When reversing

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)

When the vehicle is stopped by the
system (in this case, the continuous
beep will remain sounding)

Object (e.g., a wall)

Detecting range

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

WARNING

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

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cancel the system, refer to “Cancel-
ing the Reverse Automatic Braking
system operation” F7-66.

Operating conditions

The Reverse Automatic Braking system
will operate when all of the following
conditions are met.

EyeSight warning indicator

RAB warning indicator

RAB OFF indicator

The ignition switch is in the “ON”

position
.

The EyeSight warning indicator is off

The RAB warning indicator is off

HALT (RAB OFF) indicator is off

The Reverse Automatic Braking sys-

tem 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)

NOTE

In the following cases, the Reverse

Automatic braking system will not
operate. Promptly contact a SUBARU
dealer to have the system inspected.

– The EyeSight warning indicator
is illuminated
– The Reverse Automatic Braking
fail indicator is illuminated

When the Reverse Automatic Brak-

ing system OFF indicator is illumi-
nated, the Reverse Automatic braking
system cannot be operated.
.

In the following cases, the system

may not be able to properly detect an
obstacle. Promptly contact a 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 sensor
– The rear bumper is modified
– The rear bumper has been re-
moved and reattached
– The ground clearance is changed
due to the vehicle’s loading condi-
tion 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 up-
date, the Reverse Automatic Braking
System may not display the following
items on the audio/navigation screen
until the update is complete.

– Display Icon on/off Function
– Distance Indicator Image
– Warning Message

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 guaran-
tee 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 oper-
ate.

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The system may not be able to detect

the following objects

– 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
– Objects that are high above the
ground such as objects hanging
from above

The system may not be able to

properly detect objects or may cause
a system malfunction when the follow-
ing 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 nearby
– 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 rear bumper near the sonar
sensors is exposed to heavy rain or
a significant 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 electronic parts (fog
light, fender pole, radio antenna) or
commercial attachment parts (trai-
ler hitch, bicycle carrier, bumper
guard) are attached
– Parts that emit high frequency
sound, such as a horn or speaker,
are attached

Vehicle conditions

– The vehicle is significantly in-
clined
– The ground clearance is signifi-
cantly reduced due to the vehicle’s
loading condition, etc.
– When the sonar sensor is mis-
aligned due to a collision or an
accident

Surrounding environment

– A cloth banner, flag, hanging
branch or railroad crossing bars
are present in the reversing direc-
tion
– When reversing on a gravel or
grassy area
– When reversing in an area where
objects or walls are adjacent to the
vehicle such as narrow tunnels,
narrow bridges, narrow roads or

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narrow garages
– Wheel tracks or a hole is present
in the ground of the reversing
direction
– When reversing over a drainage
cover (grate cover)

– The path of the reversing direc-
tion is inclined such as on a steep
uphill
– A curb is present in the reversing
direction
– When reversing downhill

– When reversing on an uneven
road

In circumstances such as the follow-

ing, it may not be possible to avoid a
collision even when the system oper-
ates normally.

– 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.

Reverse Automatic Braking
System operation

When the Reverse Automatic Braking
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).

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Guideline of detecting range

Alert level

Range of detected object*

Distance indicator

Alarm pattern

Long proximity (ob-
ject detected)

35 inches (90 cm) or more Green

No warning sound

Medium proximity
alert (approaching the
object)

28 to 35 inches (70 to 90
cm)

Yellow

Short beeps

Short proximity alert
(approaching closer
to the object)

20 to 28 inches (50 to 70
cm)

Orange

Rapid short beeps

Closest proximity
alert (too close to the
object)

20 inches (50 cm) or less

Red

Continuous beep

*: Range of detection may vary depending on the environmental condition.

Obstacle detected and alert level

Long proximity alert (object detected)
1)

Green: 35 inches (90 cm) or more

Medium proximity alert (approaching the
object)
1)

Yellow: 28 to 35 inches (70 to 90 cm)

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Short proximity alert (approaching the
object closer)
1)

Orange: 20 to 28 inches (50 to 70 cm)

Closest proximity alert (too close to the
object)
1)

Red: 20 inches (50 cm) or less

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

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.

When the vehicle is being stopped
by the system

Depress brake pedal warning
1)

Warning message

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).

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After the vehicle is stopped by the
system

RAB OFF indicator: illuminates when the
Reverse Automatic Braking system is
turned OFF.
After the brake pedal is depressed, the
Reverse Automatic Braking system OFF
indicator will illuminate and the system will
temporarily stop operating. The Reverse
Automatic Braking system OFF indicator
will turn off when the select lever is shifted
to a position other than the “R” position.
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 system auto-
matically stops operating and the Reverse
Automatic Braking system OFF indicator

illuminates.
– There is ice, snow, mud, or other
substance on the sonar sensors.
– The select lever was shifted to R when
there is an obstacle located close to the
rear bumper.
– A sound with a frequency close to that
of the sonar used by the Reverse Auto-
matic Braking system was detected.

NOTE

Automatic braking only holds the vehi-
cle for 2 seconds. Before the automatic
brake is released, a warning sound (3
short beeps followed by a long beep)
will activate to alert the driver that the
automatic will be released.

Canceling the Reverse Auto-
matic Braking system opera-
tion

The Reverse Automatic Braking system
can be temporarily canceled by any of the
following operations.
.

depressing the brake pedal*

depressing the accelerator pedal*

depressing the accelerator pedal hard

(in this case, limited acceleration will be
canceled and the vehicle will continue
reversing.)
.

shifting the select lever to a position

other than the “R” position.

*: while the vehicle is stopped by the
automatic braking

NOTE

The system will be canceled if the
object is no longer detected.

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Reverse Automatic Braking
system ON/OFF setting

While the select lever is shifted to the “R”
position, the below functions of the Re-
verse Automatic Braking system can be
set by operating the audio/navigation
monitor.

ON setting key of Reverse Automatic
Braking

OFF setting key of Reverse Automatic
Braking

ON setting key of the object detection
warning beeping sound

OFF setting key of the object detection
warning beeping sound

When the ON setting key is shown, the
corresponding setting is ON.
Touch and hold the ON setting key to turn
the setting OFF.

When the OFF setting is shown, the
corresponding setting is OFF.
Touch and hold the OFF setting key to turn
the setting ON.

When the Reverse Automatic Braking
system is turned OFF, the following in-
dicator will illuminate.

RAB OFF indicator: illuminates when the
Reverse Automatic Braking system is turned
OFF.

RAB OFF indicator will turn off when the
Reverse Automatic Braking system is
turned ON.

NOTE

When the settings cannot be chan-

ged, the ON/OFF setting key will be
grayed out.
.

The ON/OFF setting key may be

greyed out if the Reverse Automatic
Braking system malfunctions, etc. In
this case, turn the ignition switch to the
“LOCK”/“OFF” position and then turn it
to the “ON” position again. If the setting
cannot be changed even after turning
the ignition switch to the “ON” position
again, consult your SUBARU dealer.
.

The settings will be restored as

follows when the select lever is shifted
to the “R” position next time.

– Reverse Automatic Braking sys-
tem settings: default (ON setting)
– Object detection warning beep-
ing sound: the setting selected by
operating the combination meter
display (color LCD)

Also, the following settings can be chan-
ged by operating the combination meter
display (color LCD).
.

Warning volume

Sonar audible alarm ON/OFF

For details, refer to “Menu screens” F3-
39.

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RAB warning indicator

RAB malfunction message

RAB warning indicator

If the Reverse Automatic Braking System
malfunctions, the above indicator illumi-
nates on the combination meter. Contact
the nearest SUBARU dealer for details.

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 system,
observe the following precautions.

Sedan

5-door models

Do not affix any stickers or other items

on the sonar sensor or the bumper surface
near the sonar sensors.
.

Always keep the sonar sensor and the

rear bumper surface near the sonar
sensors clean.
.

Do not modify the rear bumper.

Do not paint the bumper near the sonar

sensors.
.

Do not apply strong impacts to the rear

bumper near the sonar sensors. If a sensor
becomes misaligned, a system malfunc-
tion may occur, including inability 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.
.

Do not disassemble the sonar sensors.

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Subaru Impreza (2019 year). Instruction - part 21