Acura RDX (2021 year). Manual in english — page 29

462

uu

AcuraWatch

TM

u

Collision Mitigation Braking System

TM

(CMBS

TM

)

Driving

■

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.

463

uu

AcuraWatch

TM

u

Collision Mitigation Braking System

TM

(CMBS

TM

)

Continued

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).

■

Automatic shutoff

The CMBS

TM

may automatically shut itself off and the CMBS

TM

indicator (amber)

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.

Limitations applicable to pedestrian detection only

uu

AcuraWatch

TM

u

Collision Mitigation Braking System

TM

(CMBS

TM

)

464

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.

■

With Little Chance of a Collision

1

With Little Chance of a Collision

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

TM

operation.

465

uu

AcuraWatch

TM

u

Collision Mitigation Braking System

TM

(CMBS

TM

)

Driving

■

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.

466

uu

AcuraWatch

TM

u

Adaptive Cruise Control (ACC) with Low Speed Follow

Driving

Adaptive Cruise Control (ACC) with Low Speed
Follow

Helps maintain a constant vehicle speed and a set following interval behind a vehicle
detected ahead of yours and, if the detected vehicle comes to a stop, can decelerate
and stop your vehicle, without you having to keep your foot on the brake or the
accelerator.
When ACC with Low Speed Follow slows your vehicle by applying the brakes, your
vehicle’s brake lights will illuminate.

1

Adaptive Cruise Control (ACC) with Low Speed Follow

Important Reminder

As with any system, there are limits to ACC with Low
Speed Follow. Use the brake pedal whenever
necessary, and always keep a safe interval between
your vehicle and other vehicles.

ACC with Low Speed Follow can not be activated if
Intelligent Dynamics System setting is

Snow

.

3

WARNING

Improper use of ACC with Low Speed
Follow can lead to a crash.

Use ACC with Low Speed Follow only when
driving on expressways or freeways and in
good weather conditions.

3

WARNING

ACC with Low Speed Follow has limited
braking capability and may not stop your
vehicle in time to avoid a collision with a
vehicle that quickly stops in front of you.

Always be prepared to apply the brake
pedal if the conditions require.

When to use

■

Vehicle speed for ACC with Low Speed Follow:

A vehicle is detected ahead

within ACC with Low Speed Follow range

– ACC with Low Speed Follow

operates at speeds up to 90 mph (145 km/h).

No vehicle is detected within ACC with Low Speed Follow range

– ACC with

Low Speed Follow operates at the speed of 25 mph (40 km/h) or above.

■

Gear position for ACC with Low Speed Follow: In

(

D

or

(

S

.

The radar sensor
is behind the
emblem.

The camera is
located behind
the rearview
mirror.

Continued

467

uu

AcuraWatch

TM

u

Adaptive Cruise Control (ACC) with Low Speed Follow

Driving

■

How to activate the system

1

Adaptive Cruise Control (ACC) with Low Speed Follow

For directions on the proper handling of the radar
sensor, refer to the following page.

2

Radar Sensor

P. 497

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

2

Front Sensor Camera

P. 495

When the

MAIN

button is pressed, both ACC with

Low Speed Follow and the Lane Keeping Assist
System (LKAS) are either turned on or off.

ACC with Low Speed Follow may not work properly
under certain conditions.

2

ACC with Low Speed Follow Conditions
and Limitations

P. 473

When not using ACC with Low Speed Follow: Turn
off adaptive cruise by pressing the

MAIN

button. This

also will turn off the Lane Keeping Assist System
(LKAS).

How to use

■

Press the

MAIN

button on

the steering wheel.

ACC (green) is on in the instrument panel.

ACC with Low Speed Follow is ready to use.

uu

AcuraWatch

TM

u

Adaptive Cruise Control (ACC) with Low Speed Follow

468

Driving

When driving at about 25 mph (40 km/h) or above:

Take your foot off the

pedal and press down the

RES/+

/

SET/–

switch when you reach the desired speed.

The moment you release the switch, the set speed is fixed, and ACC with Low Speed
Follow begins.

When driving slower than about 25 mph (40 km/h):

If the vehicle is moving

and the brake pedal is not depressed, pressing the switch fixes your set speed to
about 25 mph (40 km/h) regardless of current vehicle speed. If your vehicle is
stationary, you can set the vehicle speed even with the brake pedal depressed.

■

To Set the Vehicle Speed

1

Adaptive Cruise Control (ACC) with Low Speed Follow

Do not use ACC with Low Speed Follow under the
following conditions:

•

On roads with heavy traffic or while driving in
continuous stop and go traffic.

•

On roads with sharp turns.

•

On roads with steep downhill sections, as the set
vehicle speed can be exceeded by coasting. In such
cases, ACC with Low Speed Follow will not apply
the brakes to maintain the set speed.

•

On roads with toll collection facilities or other
objects between lanes of traffic, or in parking
areas, or facilities with drive through access.

1

To Set the Vehicle Speed

You can switch the displayed set speed
measurements on the multi-information display or
audio/information screen between mph and km/h.

2

Speed/Distance Units

P. 138

2

Customized Features

P. 341

On when ACC with Low
Speed Follow begins

Press and release

RES/+

/

SET/–

switch

469

uu

AcuraWatch

TM

u

Adaptive Cruise Control (ACC) with Low Speed Follow

Continued

Driving

When ACC with Low Speed Follow starts
operating, the vehicle icon, interval bars and
set speed appear on the multi-information
display.

When you use ACC with Low Speed Follow,
Straight Driving Assist (a feature of the Electric
Power Steering system) is activated.
By enabling the steering system to
automatically compensate for natural steering
pull, Straight Driving Assist makes it easier for
you to keep your vehicle in a straight line.

Set Vehicle Speed

Set Vehicle Interval

uu

AcuraWatch

TM

u

Adaptive Cruise Control (ACC) with Low Speed Follow

470

Driving

■

There is a vehicle ahead

ACC with Low Speed Follow monitors if a vehicle ahead of you enters the ACC with
Low Speed Follow range. If a vehicle is detected doing so, the ACC with Low Speed
Follow system maintains or decelerates your vehicle’s set speed in order to keep the
vehicle’s set following-interval from the vehicle ahead.

2

To Set or Change Following-interval

P. 477

When a vehicle whose speed is slower than
your set speed is detected in front of you, your
vehicle starts to slow down.

■

When in Operation

1

When in Operation

If the vehicle ahead of you slows down abruptly, or if
another vehicle cuts in front of you, the beeper
sounds, a message appears on the multi-information
display, and the head-up warning lights

*

flash.

Depress the brake pedal, and keep an appropriate
interval from the vehicle ahead.

Beep

Head-up
Warning Lights

*

ACC with Low Speed Follow Range: 394 ft. (120 m)

A vehicle icon appears on the
multi-information display.

* Not available on all models

Continued

471

uu

AcuraWatch

TM

u

Adaptive Cruise Control (ACC) with Low Speed Follow

Driving

■

There is no vehicle ahead

Your vehicle maintains the set speed without
having to keep your foot on the brake or
accelerator pedal.
If there previously was a vehicle detected
ahead that kept your vehicle from traveling at
the set speed, ACC with Low Speed Follow
accelerates your vehicle to the set speed, and
then maintains it.

■

When you depress the accelerator pedal

You can temporarily increase the vehicle speed. In this case, there is no audible or
visual alert even if a vehicle is in the ACC with Low Speed Follow range.
ACC with Low Speed Follow stays on unless you cancel it. Once you release the
accelerator pedal, the system resumes an appropriate speed for keeping the
following interval while a vehicle ahead is within the ACC with Low Speed Follow
range.

1

When in Operation

Even if the interval between your vehicle and the
vehicle detected ahead is short, ACC with Low Speed
Follow may start accelerating your vehicle under the
following circumstances:

•

The vehicle ahead of you is going at almost the
same speed as, or faster than, your vehicle.

•

A vehicle that cuts in front of you is going faster
than your vehicle, gradually increasing the interval
between the vehicles.

You can also set the system to beep when a vehicle in
front of you comes in and goes out of the ACC with
Low Speed Follow detecting range. Change the

ACC

Forward Vehicle Detect Beep

setting.

2

Customized Features

P. 341

Limitations

You may need to use the brake to maintain a safe
interval when using ACC with Low Speed Follow.
Additionally, ACC with Low Speed Follow may not
work properly under certain conditions.

2

ACC with Low Speed Follow Conditions
and Limitations

P. 473

A vehicle icon with dotted-line
contour appears on the multi-
information display.

uu

AcuraWatch

TM

u

Adaptive Cruise Control (ACC) with Low Speed Follow

472

Driving

■

A vehicle detected ahead is within ACC with Low Speed Follow range and
slows to a stop

Your vehicle also stops, automatically. The

Stopped

message appears on the multi-

information display.
When the vehicle ahead of you starts again,
the vehicle icon on the multi-information
display blinks. If you press the

RES/+

/

SET/–

switch up or down, or depress the accelerator
pedal, ACC with Low Speed Follow operates
again within the prior set speed.
If no vehicle is ahead of you before you
resume driving, depress the accelerator pedal
and ACC with Low Speed Follow will operate
again within the prior set speed.

1

A vehicle detected ahead is within ACC with Low Speed Follow
range and slows to a stop

3

WARNING

Exiting a vehicle that has been stopped
while the ACC with Low Speed Follow
system is operating can result in the vehicle
moving without operator control.

A vehicle that moves without operator
control can cause a crash, resulting in
serious injury or death.

Never exit a vehicle when the vehicle is
stopped by ACC with Low Speed Follow.

Continued

473

uu

AcuraWatch

TM

u

Adaptive Cruise Control (ACC) with Low Speed Follow

Driving

The system may automatically shut off and the

ACC

with Low Speed Follow

indicator will come on under certain conditions. Some examples of these conditions
are listed below. Other conditions may reduce some of the ACC with Low Speed
Follow functions.

2

Front Sensor Camera

P. 495

■

Environmental conditions

Driving in bad weather (rain, fog, snow, etc.).

■

Roadway conditions

Driving on a snowy or wet roadway (obscured lane marking, vehicle tracks, reflected
lights, road spray, high contrast).

■

Vehicle conditions

•

The outside of the windshield is blocked by dirt, mud, leaves, wet snow, etc.

•

An abnormal tire or wheel condition (Wrong sized, varied size or construction,
improperly inflated, compact spare tire

*

, etc.).

•

The camera temperature gets too high.

•

The parking brake is applied.

•

When the radar sensor cover is dirty.

•

The vehicle is tilted due to a heavy load or suspension modifications.

•

When tire chains are installed.

■

ACC with Low Speed Follow Conditions and Limitations

1

ACC with Low Speed Follow Conditions and Limitations

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

* Not available on all models

474

uu

AcuraWatch

TM

u

Adaptive Cruise Control (ACC) with Low Speed Follow

Driving

■

Detection limitations

•

A vehicle suddenly crosses in front of you.

•

The interval between your vehicle and the vehicle 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 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 or 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 in front of you is
significantly large.

•

An oncoming vehicle suddenly comes in front of you.

•

Your vehicle abruptly crosses over in front of an oncoming vehicle.

475

uu

AcuraWatch

TM

u

Adaptive Cruise Control (ACC) with Low Speed Follow

Continued

Driving

•

When driving through a narrow iron bridge.

•

When the vehicle ahead of you brakes suddenly.

•

When the vehicle ahead of you has a unique shape.

•

When your vehicle or the vehicle ahead of you is driving on one edge of the lane.

Radar detects upper section of
an empty carrier truck.

Panel truck, tanker
truck, etc.

uu

AcuraWatch

TM

u

Adaptive Cruise Control (ACC) with Low Speed Follow

476

Driving

Increase or decrease the vehicle speed using the

RES/+

/

SET/–

switch on the steering

wheel.

•

Each time you press the switch up or down, the vehicle speed is increased or
decreased by about 1 mph or 1 km/h accordingly.

•

If you keep pressing the switch up or down, the vehicle speed increases or
decreases by about 5 mph or 5 km/h accordingly.

■

To Adjust the Vehicle Speed

1

To Adjust the Vehicle Speed

If a vehicle detected ahead is going at a speed slower
than your increased set speed, ACC with Low Speed
Follow may not accelerate your vehicle. This is to
maintain the set interval between your vehicle and
the vehicle ahead.

When you depress the accelerator pedal and then
press down and release the

RES/+

/

SET/–

switch, the

current speed of the vehicle is set.

To increase speed

To decrease speed

477

uu

AcuraWatch

TM

u

Adaptive Cruise Control (ACC) with Low Speed Follow

Continued

Driving

Press the (Interval) button to change the
ACC with Low Speed Follow following-
interval.
Each time you press the button, the following-
interval (the interval behind a vehicle detected
ahead of you) setting cycles through extra
long, long, middle, and short following-
intervals.

Determine the most appropriate following-
interval setting based on your specific driving
conditions. Be sure to adhere to any
following-interval requirements set by local
regulation.

■

To Set or Change Following-interval

Interval
Button