Acura RLX (2018 year). Manual - part 29

457

uu

Braking

u

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

u

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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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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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

uu

Braking

u

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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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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uu

Braking

u

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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uu

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

u

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

u

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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Parking Your Vehicle

u

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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Parking Your Vehicle

u

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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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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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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