Get Starting and operating -> Reverse Automatic Braking Guide for Subaru Forester SUV 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.

.

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.

.

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.

.

– 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

.

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

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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.

.

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.

.

Starting and operating -> Reverse Automatic Braking for Your Subaru Forester SUV 2024

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