Acura RLX (2018 year). Instruction — part 29

457

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Braking

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Brake System

Driving

■

The system automatically cancels when:

• You depress the brake pedal and change to

(

P or

(

R.

• You engage the parking brake.

■

The system automatically cancels and the parking brake is applied when:

• Braking is kept for more than 10 minutes.
• The driver’s seat belt is unfastened.
• The power system is turned off.
• Brake Hold System Problem appears on the multi-information display.

■

Turning off the automatic brake hold system

While the system is on, press the automatic
brake hold button again.

u

The automatic brake hold system
indicator goes off.

If you want to turn off automatic brake hold
while the system is in operation, press the
automatic brake hold button with the brake
pedal depressed.

1

Automatic Brake Hold

While the system is activated, you can turn off the
power system or park the vehicle through the same
procedure as you normally do.

2 When Stopped P. 468

Whether the system is on, or the system is activated,
the automatic brake hold turns off once the power
system is off.

1

Turning off the automatic brake hold system

Make sure to turn off the automatic brake hold
system before using an automated car wash.

You may hear an operating noise if the vehicle moves
while the automatic brake hold system is in
operation. The system generates sound while holding
the vehicle and it moves.

Automatic Brake
Hold Button

Goes
Off

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458

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Braking

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Anti-lock Brake System (ABS)

Driving

Anti-lock Brake System (ABS)

Helps prevent the wheels from locking up, and helps you retain steering control by
pumping the brakes rapidly, much faster than you.

The electronic brake distribution (EBD) system, which is part of the ABS, also
balances the front-to-rear braking distribution according to vehicle loading.

You should never pump the brake pedal. Let the ABS work for you by always
keeping firm, steady pressure on the brake pedal. This is sometimes referred to as
“stomp and steer.”

■

ABS operation

The brake pedal may pulsate slightly when the ABS is working. Keep holding the
pedal firmly down. On dry pavement, you will need to press on the brake pedal very
hard before the ABS activates. However, you may feel the ABS activate immediately
if you are trying to stop on snow or ice.

ABS may activate when you depress the brake pedal when driving on:
• Wet or snow covered roads.
• Roads paved with stone.
• Roads with uneven surfaces, such as potholes, cracks, manholes, etc.

When the vehicle speed goes under 6 mph (10 km/h), the ABS stops.

■

ABS

1

Anti-lock Brake System (ABS)

NOTICE

The ABS may not function correctly if you use a tire of
the wrong size or type.

If the ABS indicator comes on while driving, there
may be a problem with the system.
While normal braking will not be affected, there is a
possibility that the ABS will not operating. Have your
vehicle checked by a dealer immediately.

The ABS is not designed for the purpose of reducing
the time or distance it takes for a vehicle to stop: It is
designed to limit brake lockup which can lead to
skidding and loss of steering control.

In the following cases, your vehicle may need more
distance to stop than a vehicle without the ABS:

•

You are driving on rough or uneven road surfaces,
such as gravel or snow.

•

The tires are equipped with snow chains.

The following may be observed with the ABS system:

•

Motor sounds coming from the engine
compartment when the brakes are applied, or
when system checks are being performed after the
engine has been started and while vehicle is
accelerates.

•

Brake pedal and/or the vehicle body vibration when
ABS activates.

These vibrations and sounds are normal to ABS
systems and are no cause for concern.

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459

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Braking

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Brake Assist System

Driving

Brake Assist System

Designed to assist the driver by generating greater braking force when you depress
the brake pedal hard during emergency braking.

■

Brake assist system operation

Press the brake pedal firmly for more powerful braking.

When brake assist operates, the pedal may wiggle slightly and an operating noise
may be heard. This is normal. Keep holding the brake pedal firmly down.

■

Brake Assist System

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460

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Braking

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Collision Mitigation Braking System

TM

(CMBS

TM

)

Driving

Collision Mitigation Braking System

TM

(CMBS

TM

)

Can assist you when there is a possibility of your vehicle colliding with a vehicle or a
pedestrian detected in front of yours. The CMBS

TM

is designed to alert you when a

potential collision is determined, as well as to reduce your vehicle speed to help
minimize collision severity when a collision is deemed unavoidable.

■

How the system works

1

Collision Mitigation Braking System

TM

(CMBS

TM

)

Important Safety Reminder
The CMBS

TM

is designed to reduce the severity of an

unavoidable collision. It does not prevent a collision
nor stop the vehicle automatically. It is still your
responsibility to operate the brake pedal and steering
wheel appropriately according to the driving
conditions.

The CMBS

TM

may not activate or may not detect a

vehicle in front of your vehicle under certain
conditions:

2 CMBS

TM

Conditions and Limitations P. 464

You can read about handling information for the
camera equipped with this system.

2 Front Sensor Camera P. 402

Be careful not to have the radar sensor cover strongly
impacted.

1

How the system works

Rapid vibrations on the steering wheel alert you
when your vehicle speed is between 19 and 62 mph
(30 and 100 km/h) with an oncoming vehicle
detected in front of you.

When the CMBS

TM

activates, it may automatically

apply the brake. It will be canceled when your vehicle
stops or a potential collision is not determined.

The radar sensor is
in the front grille.

The camera is
located behind
the rearview
mirror.

The system starts monitoring the roadway ahead when your vehicle speed is about 3
mph (5 km/h) and there is a vehicle in front of you.

When to use

The CMBS

TM

activates when:

●

The speed difference between your vehicle and a vehicle or pedestrian detected
in front of you becomes about 3 mph (5 km/h) and over with a chance of a
collision.

●

Your vehicle speed is about 62 mph (100 km/h) or less and there is a chance of a
collision with an oncoming detected vehicle or a pedestrian in front of you.

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Continued

461

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Braking

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Collision Mitigation Braking System

TM

(CMBS

TM

)

Driving

■

When the system activates

At system’s earliest collision alert stage, you can change the distance (Long/
Normal/Short) between vehicles at which alerts will come on through audio/
information screen setting options.

2 Customized Features P. 297

■

Vibration alert on the steering wheel

When a potential collision to an oncoming detected vehicle is determined, the
system alerts you with rapid vibration on the steering wheel, in addition to visual and
audible alerts.

u

Take appropriate action to prevent a collision (apply the brakes, operate the
steering wheel, etc.).

1

When the system activates

The camera in the CMBS

TM

is also designed to detect

pedestrians.
However, this pedestrian detection feature may not
activate or may not detect a pedestrian in front of
your vehicle under certain conditions.
Refer to the ones indicating the pedestrian detection
limitations from the list.

2 CMBS

TM

Conditions and Limitations P. 464

The head-up warning uses a lens located at the front
end of the dashboard.
Do not cover the lens or spill any liquid on it.

Lens

The system provides visual, audible and tactile alerts of a possible collision, and
stops if the collision is avoided.

u

Take appropriate action to prevent a collision (apply the brakes, change
lanes, etc.)

Beep

Head-up
Warning

Visual Alerts

Audible Alert

Tactile Alert

1

Vibration alert on the steering wheel

Vibration alert function is disabled when the electric
power steering (EPS) system indicator comes on.

2 Electric Power Steering (EPS) System

Indicator P. 84

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462

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Braking

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Collision Mitigation Braking System

TM

(CMBS

TM

)

Driving

The system has three alert stages for a possible collision. However, depending on circumstances, the CMBS

TM

may not go through all of

the stages before initiating the last stage.

■

Collision Alert Stages

Distance between vehicles

CMBS

TM

The radar sensor

detects a vehicle

E-pretensioner/

Reactive Force Pedal

Audible & Visual WARNINGS

Steering

Wheel

Braking

Stage

one

There is a risk of a
collision with the
vehicle ahead of
you.

Increases the
accelerator pedal
resistance force.

When in Long, visual and
audible alerts come on at a
longer distance from a vehicle
ahead than in Normal setting,
and in Short, at a shorter
distance than in Normal.

In case of
an
oncoming
vehicle
detected,
rapid
vibration is
provided.

—

Stage

two

The risk of a
collision has
increased, time to
respond is
reduced.

Retracts the driver’s
seat belt gently a few
times, providing a
physical warning.

Visual and audible alerts.

—

Lightly

applied

Stage

three

The CMBS

TM

determines that a
collision is
unavoidable.

Forcefully tightens
driver and front
passenger seat belts.

Forcefully

applied

Your Vehicle

Vehicle
Ahead

Normal

Short

Long

Accelerator Pedal

Your
Vehicle

Vehicle
Ahead

Your
Vehicle

Vehicle
Ahead

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Continued

463

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Braking

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Collision Mitigation Braking System

TM

(CMBS

TM

)

Driving

Press and hold the button until the beeper
sounds to switch the system on or off.

When the CMBS

TM

is off:

• The CMBS

TM

indicator in the instrument

panel comes on.

• A message on the multi-information display

reminds you that the system is off.

The CMBS

TM

is turned on every time you turn

the power system on, even if you turned it off
the last time you drove the vehicle.

■

CMBS

TM

On and Off

1

Collision Mitigation Braking System

TM

(CMBS

TM

)

The CMBS

TM

may automatically shut off, and the

CMBS

TM

indicator will come and stay on under certain

conditions:

2 CMBS

TM

Conditions and Limitations P. 464

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Braking

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Collision Mitigation Braking System

TM

(CMBS

TM

)

464

Driving

The system may automatically shut off and the CMBS

TM

indicator will come on under

certain conditions. Some examples of these conditions are listed below. Other
conditions may reduce some of the CMBS

TM

functions.

2 Front Sensor Camera P. 402

■

Environmental conditions

• Driving in bad weather (rain, fog, snow, etc.).
• Sudden changes between light and dark, such as an entrance or exit of a tunnel.
• There is little contrast between objects and the background.
• Driving into low sunlight (e.g., at dawn or dusk).
• Strong light is reflected onto the roadway.
• Driving in the shadows of trees, buildings, etc.
• Roadway objects or structures are misinterpreted as vehicles and pedestrians.
• Reflections on the interior of the windshield.
• Driving at night or in a dark condition such as a tunnel.

■

Roadway conditions

• Driving on a snowy or wet roadway (obscured lane marking, vehicle tracks,

reflected lights, road spray, high contrast).

• Driving on curvy, winding, or undulating roads.
• The road is hilly or the vehicle is approaching the crest of a hill.

■

CMBS

TM

Conditions and Limitations

1

CMBS

TM

Conditions and Limitations

Do not paint, or apply any coverings or paint to the
radar sensor area. This can impact CMBS

TM

operation.

Have your vehicle checked by a dealer if you find any
unusual behavior of the system (e.g., the warning
message appears too frequently).

If the front of the vehicle is impacted in any of the
following situations, the radar sensor may not work
properly. Have your vehicle checked by a dealer:

•

The vehicle mounted onto a bump, curb, chock,
embankment, etc.

•

You drive the vehicle where the water is deep.

•

Your vehicle has a frontal collision.

If you need the radar sensor to be repaired, or
removed, or the radar sensor cover is strongly
impacted, turn off the system by pressing the
CMBS

TM

OFF button and take your vehicle to a

dealer.

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465

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Braking

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Collision Mitigation Braking System

TM

(CMBS

TM

)

Continued

Driving

■

Vehicle conditions

• Headlight lenses are dirty or the headlights are not properly adjusted.
• The outside of the windshield is blocked by dirt, mud, leaves, wet snow, etc.
• The inside of the windshield is fogged.
• An abnormal tire or wheel condition (wrong sized, varied size or construction,

improperly inflated, compact spare tire

*

, etc.).

• When tire chains are installed.
• The vehicle is tilted due to a heavy load or suspension modifications.
• The camera temperature gets too high.
• Driving with the parking brake applied.
• When the radar sensor in the front grille gets dirty.

■

Detection limitations

• A vehicle or pedestrian suddenly crosses in front of you.
• The distance between your vehicle and the vehicle or pedestrian ahead of you is

too short.

• A vehicle cuts in front of you at a slow speed, and it brakes suddenly.
• When you accelerate rapidly and approach the vehicle or pedestrian ahead of you

at high speed.

• The vehicle ahead of you is a motorcycle, bicycle, mobility scooter or other small

vehicle.

• When there are animals in front of your vehicle.
• When you drive on a curved, winding or undulating road that makes it difficult for

the sensor to properly detect a vehicle in front of you.

• The speed difference between your vehicle and a vehicle or pedestrian in front of

you is significantly large.

• An oncoming vehicle suddenly comes in front of you.
• Another vehicle suddenly comes in front of you at an intersection, etc.
• Your vehicle abruptly crosses over in front of an oncoming vehicle.
• When driving through a narrow iron bridge.
• When the lead vehicle suddenly slows down.

* Not available on all models

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466

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Braking

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Collision Mitigation Braking System

TM

(CMBS

TM

)

Driving

• When there is a group of people in front of your vehicle walking together side by

side.

• Surrounding conditions or belongings of the pedestrian alter the pedestrian’s

shape, preventing the system from recognizing that the person is a pedestrian.

• When the pedestrian is shorter than about 3.3 feet (1 meter) or taller than about

6.6 feet (2 meters) in height.

• When a pedestrian blends in with the background.
• When a pedestrian is bent over or squatting, or when their hands are raised or

they are running.

• When several pedestrians are walking ahead in a group.
• When the camera cannot correctly identify that a pedestrian is present due to an

unusual shape (holding luggage, body position, size).

The CMBS

TM

may automatically shut itself off and the CMBS

TM

indicator comes and

stays on when:
• The temperature inside the system is high.
• You drive off-road or on a mountain road, or curved and winding road for an

extended period.

• An abnormal tire condition is detected (wrong tire size, flat tire, etc.).
• The camera behind the rearview mirror, or the area around the camera, including

the windshield, gets dirty.

Once the conditions that caused the CMBS

TM

to shut off improve or are addressed

(e.g., cleaning), the system comes back on.

■

Automatic shutoff

Limitations applicable to pedestrian detection only

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Braking

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Collision Mitigation Braking System

TM

(CMBS

TM

)

Driving

The CMBS

TM

may activate even when you are aware of a vehicle ahead of you, or

when there is no vehicle ahead. Some examples of this are:

■

When Passing

Your vehicle approaches another vehicle ahead of you and you change lanes to pass.

■

At an intersection

Your vehicle approaches or passes another vehicle that is making a left or right turn.

■

On a curve

When driving through curves, your vehicle comes to a point where an oncoming
vehicle is right in front of you.

■

Through a low bridge at high speed

You drive under a low or narrow bridge at high speed.

■

Speed bumps, road work sites, train tracks, roadside objects, etc.

You drive over speed bumps, steel road plates, etc., or your vehicle approaches train
tracks or roadside objects [such as a traffic sign and guard rail] on a curve or, when
parking, stationary vehicles and walls.

■

With Little Chance of a Collision

1

Collision Mitigation Braking System

TM

(CMBS

TM

)

For the CMBS

TM

to work properly:

Always keep the radar sensor cover clean.

Never use chemical solvents or polishing powder for
cleaning the sensor cover. Clean it with water or a
mild detergent.

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468

Driving

Parking Your Vehicle

When Stopped

1. Depress the brake pedal firmly.
2. With the brake pedal depressed, pull up the electric parking brake switch slowly,

but fully.

3. Change the gear position to

(

P.

4. Turn off the power system.

u

The electric parking brake indicator goes off in about 15 seconds.

Always confirm the electric parking brake is set, in particular if you are parked on an
incline.

1

Parking Your Vehicle

Do not park your vehicle near flammable objects,
such as dry grass, oil, or timber.
Heat from the exhaust can cause a fire.

3

WARNING

The vehicle can roll away if left unattended
without confirming that Park is engaged.

A vehicle that rolls away could cause a crash
resulting in serious injury or death.

Always keep your foot on the brake pedal
until you have confirmed that

(

P

is shown

on the gear position indicator.

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469

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Parking Your Vehicle

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When Stopped

Driving

If during in Auto Engine Stop, the gear position changes to

(

P and the engine

restarts automatically under the following conditions:
• The power system is on.
• The gear position is not in

(

P.

• You unfasten the driver side seat belt and open the door.

1

When Stopped

NOTICE

The following can damage the driveline:

•

Depressing the accelerator and brake pedals
simultaneously.

•

Changing into

(

P before the vehicle stops

completely.

When facing uphill, do not hold the vehicle by
depressing the accelerator pedal.
Doing so may cause the power system to overheat
and fail.

In extremely cold temperatures, the parking brake
may freeze up if applied. If such temperatures are
expected, do not apply the parking brake but, if
parking on a slope, either turn the front wheels so
they will contact the curb if the vehicle rolls down the
slope or block the wheels to keep the vehicle from
moving. If you do not take either precaution, the
vehicle may roll unexpectedly, leading to a crash.

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470

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Parking Your Vehicle

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Parking Sensor System

*

Driving

Parking Sensor System

*

The corner and center sensors monitor obstacles around your vehicle, and the
beeper and audio/information screen let you know the approximate distance
between your vehicle and the obstacle.

■

The sensor location and range

1

Parking Sensor System

*

Even when the system is on, always confirm if there is
no obstacle near your vehicle before parking.

The system may not work properly when:

•

The sensors are covered with snow, ice, mud or
dirt.

•

The vehicle is on uneven surface, such as grass,
bumps, or a hill.

•

The vehicle has been out in hot or cold weather.

•

The system is affected by devices that emit
ultrasonic waves.

•

Driving in bad weather.

The system may not sense:

•

Thin or low objects.

•

Sonic-absorptive materials, such as snow, cotton,
or sponge.

•

Objects directly under the bumper.

Do not put any accessories on or around the sensors.

Within about 24 in (60 cm) or less

Front Corner Sensors

Rear Corner Sensors

Rear Center Sensors

Within about 43 in (110 cm) or less

* Not available on all models

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471

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Parking Your Vehicle

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Parking Sensor System

*

Continued

Driving

■

Parking sensor system on and off

With the power mode in ON, press the
parking sensor system button to turn the
system on or off. The indicator in the button
comes on when the system is on.

The front corner sensors and the rear center
and corner sensors start to detect an obstacle
when the transmission is in

(

R.

The front corner sensors start to detect an
obstacle when the transmission is not in

(

P,

and the vehicle speed is less than 6 mph (9
km/h).

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472

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Parking Your Vehicle

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Parking Sensor System

*

Driving

■

When the distance between your vehicle and obstacles behind becomes shorter

*1: At this stage, only the center sensors detect obstacles.

Length of the

intermittent beep

Distance between the Bumper and Obstacle

Indicator

Audio/information screen

Corner Sensors

Center Sensors

Moderate

—

Rear: About 43-24 in

(110-60 cm)

Blinks in Yellow

*1

Short

About 24-18 in

(60-45 cm)

About 24-18 in

(60-45 cm)

Blinks in Amber

Very short

About 18-14 in

(45-35 cm)

About 18-14 in

(45-35 cm)

Continuous

About 14 in

(35 cm) or less

About 14 in

(35 cm) or less

Blinks in Red

Indicators light where the
sensor detects an obstacle.

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