Acura ILX (2021 year). Manual in english - page 29

462

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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.

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Adaptive Cruise Control (ACC)

Continued

Driving

Adaptive Cruise Control (ACC)

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

1

Adaptive Cruise Control (ACC)

Important Reminder

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

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

2

Radar Sensor

 P. 495

3

WARNING

Improper use of ACC can lead to a crash.

Use ACC only when driving on expressways 
or freeways and in good weather 
conditions.

3

WARNING

ACC has limited braking capability.

When your vehicle speed drops below 22 
mph (35 km/h), ACC will automatically 
cancel and no longer will apply your 
vehicle’s brakes.

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

When to use

■

Vehicle speed for adaptive cruise control: Desired speed in a range above 

roughly 25 mph (40 km/h) ~

■

Shift positions for ACC: In 

(

D

 or 

(

S

.

The radar sensor is 

behind the emblem.

The camera is 

located behind the 

rearview mirror.

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Adaptive Cruise Control (ACC)

464

Driving

■

How to activate the system

1

Adaptive Cruise Control (ACC)

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

2

Front Sensor Camera

 P. 493

When the 

MAIN

 button is pressed, both ACC and 

the Lane Keeping Assist System (LKAS) are either 
turned on or off.

ACC may not work properly under certain conditions.

2

ACC Conditions and Limitations

 P. 468

When not using ACC: Turn off adaptive cruise by 
pressing the 

MAIN

 button. This also will turn off the 

Lane Keeping Assist System (LKAS).

Do not use ACC 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 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.

■

Press the 

MAIN

 button on 

the steering wheel.

ACC

 (green) is on in the 

instrument panel.
ACC is ready to use.

How to use

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Adaptive Cruise Control (ACC)

Continued

Driving

Take your foot off the pedal and press the 

DECEL/SET

 button when you reach the 

desired speed.

The moment you release the button, the set 
speed is fixed, and ACC begins.

u

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

■

To Set the Vehicle Speed

On when ACC 

begins

Press and release

DECEL/SET

 Button

Set Vehicle Speed

Set Vehicle Interval

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Adaptive Cruise Control (ACC)

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Driving

■

There is a vehicle ahead

ACC monitors if a vehicle ahead of you enters the ACC range. If a vehicle is detected 
doing so, the ACC 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. 472

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 detected ahead of you slows down 
abruptly, or if another vehicle is detected cutting in 
front of you, the beeper sounds and a message 
appears on the multi-information display.

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

Beep

ACC Range: 394 ft. (120 m)

A vehicle icon appears on the 

multi-information display

Continued

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Adaptive Cruise Control (ACC)

Driving

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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 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 alerts even if a vehicle is in the ACC range.
ACC stays on unless you cancel it. Once you release the accelerator pedal, the 
system resumes the set speed.
There are times when the vehicle speed will decrease when the accelerator pedal is 
lightly applied.

1

When in Operation

Even if the interval between your vehicle and the 
vehicle detected ahead is short, ACC 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 
detecting range. Change the 

ACC Forward Vehicle 

Detect Beep

 setting.

2

Customized Features

 P. 99, 315

Limitations

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

2

ACC Conditions and Limitations

 P. 468

A vehicle icon with dotted-line 

contour appears on the multi-

information display

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Adaptive Cruise Control (ACC)

468

Driving

The system may automatically shut off and the 

ACC

 indicator will come on under 

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

2

Front Sensor Camera

 P. 493

2

Radar Sensor

 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 front grille is dirty.

•

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

•

When tire chains are installed.

■

ACC Conditions and Limitations

1

ACC 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

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Adaptive Cruise Control (ACC)

Continued

Driving

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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.

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Adaptive Cruise Control (ACC)

Driving

•

When driving through a narrow metal 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.

Continued

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Adaptive Cruise Control (ACC)

Driving

Increase or decrease the vehicle speed using the 

RES/ACCEL

 or 

DECEL/SET

 buttons 

on the steering wheel.

•

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

•

If you keep the button pressed, 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 may not 
accelerate your vehicle. This is to maintain the set 
interval between your vehicle and the vehicle ahead.

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

2

Customized Features

 P. 99, 315

To increase speed

To decrease speed

472

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Adaptive Cruise Control (ACC)

Driving

Press the   (interval) button to change the 
ACC 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

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Adaptive Cruise Control (ACC)

Continued

Driving

The higher your vehicle’s following-speed is, the longer the short, middle, long or 
extra long following-interval becomes. See the following examples for your 
reference.

Following-interval

When the Set Speed is:

50 mph (80 km/h)

65 mph (104 km/h)

Short

84 feet

26 meters

1.1 sec

102 feet

31 meters

1.1 sec

Middle

111 feet

34 meters

1.5 sec

139 feet

43 meters

1.5 sec

Long

155 feet

48 meters

2.1 sec

202 feet

62 meters

2.1 sec

Extra 
Long

215 feet

66 meters

3.0 sec

285 feet

87 meters

3.0 sec

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Adaptive Cruise Control (ACC)

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Driving

To cancel ACC, do any of the following:

•

Press the 

CANCEL

 button.

•

Press the 

MAIN

 button.

u

ACC

 indicator goes off.

•

Depress the brake pedal.

■

To Cancel

1

To Cancel

Resuming the prior set speed: After you have 
canceled ACC, you can resume the prior set speed 
while it is still displayed. Press the 

RES/ACCEL

 button 

when driving at a speed of at least 25 mph (40 km/h) 
or more.

The set speed cannot be set or resumed when ACC 
has been turned off using the 

MAIN

 button. Press 

the 

MAIN

 button to activate the system, then set the 

desired speed.

CANCEL

 

Button

MAIN

 

Button

Continued

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Adaptive Cruise Control (ACC)

Driving

■

Automatic cancellation

The beeper sounds and a message appears on the multi-information display when 
ACC is automatically canceled. Any of these conditions may cause the ACC to 
automatically cancel:

•

Bad weather (rain, fog, snow, etc.)

•

When the radar sensor behind the emblem gets dirty.

•

The vehicle ahead of you cannot be detected.

•

An abnormal tire condition is detected, or the tires are skidding.

•

Driving on a mountainous road, or driving off road for extended periods.

•

Abrupt steering wheel movement.

•

When the ABS, VSA

®

 or CMBS

TM

 is activated.

•

When the 

ABS

 or VSA

®

 system indicator comes on.

•

When you manually apply the parking brake.

•

When the detected vehicle within the ACC range is too close to your vehicle.

•

The camera behind the rearview mirror, or the area around the camera, including 
the windshield, gets dirty.

1

Automatic cancellation

Even though ACC has been automatically canceled, 
you can still resume the prior set speed. Wait until the 
condition that caused ACC to cancel improves, then 
press the 

RES/ACCEL

 button.

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Adaptive Cruise Control (ACC)

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Driving

Press and hold the   (interval) button for one 
second. 

Cruise Mode Selected

 appears on 

the multi-information display for two seconds, 
and then the mode switches to Cruise.
To switch back to ACC, press and hold the   
button again for one second. 

ACC Mode 

Selected

 appears on the multi-information 

display for two seconds.

■

When to use

Desired speed in a range above roughly 25 mph (40 km/h) ~.

Take your foot off the pedal and press the 

DECEL/SET

 button when you reach the 

desired speed.
The moment you release the 

DECEL/SET

 button, the set speed is fixed, and cruise 

control begins. The 

CRUISE CONTROL

 indicator comes on.

Each time you press the 

RES/ACCEL

 or 

DECEL/SET

 button, the vehicle speed is 

increased or decreased by about 1 mph (1.6 km/h).
If you keep the 

RES/ACCEL

 or 

DECEL/SET

 button pressed, the vehicle speed 

increases or decreases until you release it. This speed is then set.

■

To Switch ACC to Cruise Control

1

To Switch ACC to Cruise Control

Always be aware which mode you are in. When you 
are driving in Cruise mode, the system will not assist 
you to maintain a following-interval from a vehicle 
ahead of you.

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

2

Customized Features

 P. 99, 315

ACC ON

Cruise 

Control ON

■

To Set the Vehicle Speed

■

To Adjust the Vehicle Speed

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Adaptive Cruise Control (ACC)

Driving

To cancel cruise control, do any of the following:

•

Press the 

CANCEL

 button.

•

Press the 

MAIN

 button.

•

Depress the brake pedal.

The 

CRUISE CONTROL

 indicator goes off.

■

To Cancel

1

To Cancel

Resuming the prior set speed:
After cruise control has been canceled, you can still 
resume the prior set speed by pressing the 

RES/

ACCEL

 button while driving at a speed of at least 25 

mph (40 km/h) or more.

You cannot set or resume in the following situations:

•

When vehicle speed is less than 25 mph (40 km/h).

•

When the 

MAIN

 button is turned off.

At vehicle speeds of 22 mph (35 km/h) or less, cruise 
control is canceled automatically.