Acura TLX (2021 year). Manual in english - page 26

413

Continued

Driving

AcuraWatch

TM

AcuraWatch

TM

 is a driver support system which employs the use of two distinctly 

different kinds of sensors, a radar sensor located behind the emblem and a front 
sensor camera mounted to the interior side of the windshield, behind the rearview 
mirror.

AcuraWatch

TM

 has following functions.

■

The functions which do not require switch operations to activate

•

Collision Mitigation Braking System

TM

 (CMBS

TM

) 

2

 P. 417

•

Road Departure Mitigation (RDM) System 

2

 P. 469

•

Traffic Sign Recognition System 

2

 P. 474

■

The functions which require switch operations to activate

•

Adaptive Cruise Control (ACC) with Low Speed Follow 

2

 P. 428

•

Lane Keeping Assist System (LKAS) 

2

 P. 448

•

Traffic Jam Assist 

2

 P. 457

414

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AcuraWatch

TM

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Driving

■

 Button

Press to activate standby mode for ACC with 
Low Speed Follow and Traffic Jam Assist. Or 
press to cancel these systems.

■

LKAS Button

Press to activate standby mode for LKAS and 
Traffic Jam Assist. Or press to cancel these 
systems.

■

RES/+/SET/− Switch

Press 

RES/+

 switch to resume the ACC with 

Low Speed Follow or increase the vehicle 
speed.
Press 

SET/−

 switch to set the ACC with Low 

Speed Follow or decrease the vehicle speed.

■

Interval Button

Press to change the ACC with Low Speed 
Follow following-interval.

■

CANCEL Button

Press to cancel ACC with Low Speed Follow.

■

Operation Switches for the ACC with Low Speed Follow/

LKAS/Traffic Jam Assist

Interval 

Button

LKAS 

Button

 Button

CANCEL

 

Button

RES/+

/

SET/−

 

Switch

415

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TM

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Driving

You can see the current state of ACC with 
Low Speed Follow, LKAS and Traffic Jam 
Assist.
When both of 

a

 and 

b

 indicates, Traffic Jam 

Assist is ready to be activated.

You can have the head-up display show you the current state of each function.

2

Head-Up Display

*

 P. 111

■

Multi-Information Display Content

6

a

Indicates that ACC with Low Speed Follow is ready to be activated.

•

Green: The system is on.

•

White: The system is standby.

•

Amber: There is a problem with the system.

b

Indicates that LKAS is ready to be activated.

•

Green: The system is on.

•

White: The system is standby.

•

Amber: There is a problem with the system.

c

Indicates that LKAS is activated and whether or not traffic lane lines are detected.

•

Solid line: The system is on.

•

Contour line: The system is in standby.

d

Indicates whether or not ACC with Low Speed Follow detected the vehicle ahead.

e

Shows vehicle set speed in ACC with Low Speed Follow.

f

Shows set vehicle interval in ACC with Low Speed Follow.

Models with Head-up display

* Not available on all models

416

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AcuraWatch

TM

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Driving

To activate ACC with Low Speed Follow, LKAS, and Traffic Jam Assist, carry out the following steps:

■

How to Operate the Buttons on the Steering Wheel

Press the 

 Button

 Button

RES/+

/

SET/−

 

Switch

LKAS Button

ACC with Low Speed 

Follow

The vehicle icon, 

interval bars and set 

speed appear on the 

multi-information 

display.

Press the 

LKAS 

Button

Press the 

RES/+

/

SET/−

 

Switch down

Press the LKAS 

Button

Traffic Jam Assist

Keep your vehicle near the center of the lane while 

driving.
Keep vehicle speed under 45mph (72 km/h).

Lane outlines appear on the 

multi-information display.
Traffic Jam Assist is ready to 

use.

The dotted outer lines 

change to solid ones once 

the system starts operating 

after detecting the left and 

right lane markings.

LKAS

Keep your vehicle near the center of the lane while driving.
Keep vehicle speed over 45mph (72 km/h).

Lane outlines (dotted 

outer lines) appear on the 

multi-information display. 

LKAS is activated.

The dotted outer lines change to 

solid ones once the system starts 

operating after detecting the left 

and right lane markings.

Press the 

 button, and then press 

the 

RES/+

/

SET/−

 Switch down

 (white)

 (white)

 (green)

 (green)

417

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AcuraWatch

TM

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Collision Mitigation Braking System

TM

 (CMBS

TM

)

Continued

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 the 

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

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 collisions 
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. 422

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

2

Front Sensor Camera

 P. 480

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

2

Radar Sensor

 P. 482

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AcuraWatch

TM

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Collision Mitigation Braking System

TM

 (CMBS

TM

)

418

Driving

■

How the system works

1

How the system works

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 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.

The radar sensor is 

behind the emblem.

The camera is 

located behind the 

rearview mirror.

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 the system determines 
there is a chance of a collision with:
- Vehicles detected in front of you that are stationary, oncoming, or traveling in 
your same direction.
- A pedestrian who is detected in front of you.

●

Your vehicle speed is above 62 mph (100 km/h), and the system determines there 
is a chance of a collision with a vehicle detected in front of you traveling in your 
same direction.

Continued

419

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AcuraWatch

TM

u

Collision Mitigation Braking System

TM

 (CMBS

TM

)

Driving

■

When the system activates

You can change the distance (

Long

/

Normal

/

Short

) between vehicles at which the 

system’s earliest collision alert will come on through audio/information screen 
setting options.

2

Customized Features

 P. 300

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. 422

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.

Models with Head-up display

Lens

The system provides visual and audible 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 Lights

*

Visual Alerts

Audible Alert

* Not available on all models

420

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AcuraWatch

TM

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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

Audible & Visual WARNINGS

Braking

Stage one

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

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

.

—

Stage two

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

Visual and audible alerts.

Lightly applied

Stage three 

The CMBS

TM

 determines that a 

collision is unavoidable.

Forcefully applied

Your Vehicle

Vehicle 
Ahead

Normal

Short

Long

Your 
Vehicle

Vehicle 
Ahead

Your 
Vehicle

Vehicle 
Ahead

Continued

421

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AcuraWatch

TM

u

Collision Mitigation Braking System

TM

 (CMBS

TM

)

Driving

When you turn the CMBS

TM

 on and off, do the 

following.

1.

Press the safety support switch.

2.

Roll the right selector wheel to the 

 

symbol and push it.

u

The message appears on the multi-
information display when the system 
becomes on or off.

u

A check mark appears in the box and the 
color of the 

 symbol changes green 

when the system is on. The check mark 
disappear and the color of the 

 

symbol changes gray when the system is 
off.

The CMBS

TM

 is turned on every time you start 

the engine, 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 

safety support indicator (amber) will come and stay 
on under certain conditions:

2

CMBS

TM

 Conditions and Limitations

 P. 422

When the CMBS

TM

 is activated, it will continue to 

operate even if the accelerator pedal is partially 
depressed.
However, it will be canceled if the accelerator pedal is 
deeply depressed.

The vehicle stability assist

TM

 (VSA

®

) system, vehicle 

stability assist

TM

 (VSA

®

) OFF, adaptive cruise control 

(ACC) with low speed follow, and safety support 
indicators may come on in amber along with a 
message in the multi-information display when you 
set the power mode to ON after reconnecting a 
battery.
Drive a short distance at more than 12 mph (20 
km/h).
Each indicator should go off. If any do not, have your 
vehicle checked by a dealer.

Right Selector Wheel

Safety Support Switch

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AcuraWatch

TM

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Collision Mitigation Braking System

TM

 (CMBS

TM

)

422

Driving

The system may automatically shut off and the safety support indicator (amber) 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. 480

2

Radar Sensor

 P. 482

■

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

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

423

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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 behind the emblem gets dirty.

* Not available on all models

424

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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 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.

425

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Collision Mitigation Braking System

TM

 (CMBS

TM

)

Continued

Driving

Limitations applicable to pedestrian detection only

•

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 meter) 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 safety support 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.

uu

AcuraWatch

TM

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Collision Mitigation Braking System

TM

 (CMBS

TM

)

426

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

Collision Mitigation Braking System

TM

 (CMBS

TM

)

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

TM

 operation.

427

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AcuraWatch

TM

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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.

428

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AcuraWatch

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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.

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.

■

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 about 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.

When to use