Acura ILX (2018 year). Manual - part 24

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When Driving

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Adaptive Cruise Control (ACC)

*

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.

Be careful not to severely impact the radar sensor 
cover.

3

WARNING

Improper use of ACC can lead to a crash.

Use ACC only when traveling on open 
highways in good weather.

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 adaptive cruise control: In 

(

D or 

(

S.

The radar sensor is in 
the front grille.

The camera is 
located behind the 
rearview mirror.

* Not available on all models

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When Driving

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Adaptive Cruise Control (ACC)

*

Driving

■

How to activate the system

1

Adaptive Cruise Control (ACC)

*

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. 377

When not using adaptive cruise control: 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.

* Not available on all models

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Adaptive Cruise Control (ACC)

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Driving

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 adaptive 
cruise control begins.

u

A vehicle icon and interval bars 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. 380

■

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

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 
detected 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, 263

Beep

ACC Range: 394 ft. (120 m)

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When Driving

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Adaptive Cruise Control (ACC)

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376

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 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 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

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. 377

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

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When Driving

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Adaptive Cruise Control (ACC)

*

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. 370

■

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

The radar sensor for ACC is shared with the Collision 
Mitigation Braking System

TM

 (CMBS

TM

).

2 Collision Mitigation Braking System

TM

 

(CMBS

TM

)

*

 P. 412

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

2 Front Sensor Camera

*

 P. 370

* Not available on all models

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Adaptive Cruise Control (ACC)

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Driving

■

Detection limitations

• A vehicle or pedestrian suddenly crosses in front of you.
• The interval 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 or winding or undulating road that makes it difficult 

for the sensor to properly detect a vehicle or a pedestrian 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.
• 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.

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When Driving

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Adaptive Cruise Control (ACC)

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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 set the vehicle speed using the DECEL/SET 
button on the steering wheel when adjusting the 
speed with the accelerator and brake pedals.

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

2 Customized Features P. 99, 263

To increase speed

To decrease speed

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When Driving

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Adaptive Cruise Control (ACC)

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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)

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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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When Driving

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Adaptive Cruise Control (ACC)

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382

Driving

To cancel adaptive cruise control, do any of 
the following:
• Press the CANCEL button.
• Press the MAIN button.
• Depress the brake pedal.

■

To Cancel

1

To Cancel

Resuming the prior set speed: After you have 
canceled adaptive cruise control, 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.

You cannot set or resume when vehicle speed is less 
than 25 mph (40 km/h).

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

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Adaptive Cruise Control (ACC)

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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 
cancellation:
• Your vehicle speed slows down to 22 mph (35 km/h) and below.
• Bad weather (rain, fog, snow, etc.)
• When the radar sensor in the front grille 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® 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 adaptive cruise control 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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When Driving

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Adaptive Cruise Control (ACC)

*

384

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 
between mph and km/h.

2 Customized Features P. 99

ACC ON

Cruise 
Control ON

■

To Set the Vehicle Speed

■

To Adjust the Vehicle Speed

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When Driving

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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 canceled automatically.

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Road Departure Mitigation (RDM) System

*

Driving

Road Departure Mitigation (RDM) System

*

Alerts and helps to assist you when the system detects a possibility of your vehicle 
unintentionally crossing over detected lane markings and/or leaving the roadway 
altogether.

The front camera behind the rearview mirror 
monitors left and right lane markings (in white 
or yellow). If your vehicle is getting too close to 
detected lane markings without a turn signal 
activated, the system, in addition to a visual 
alert, applies steering torque and alerts you 
with rapid vibrations on the steering wheel, to 
help you remain within the detected lane.

As a visual alert, the Lane Departure 
message appears on the multi-information 
display.

If the system determines that its steering input 
is insufficient to keep your vehicle on the 
roadway, it may apply braking.

u

Braking is applied only when the lane 
markings are solid continuous lines.

The system cancels assisting operations when you turn the steering wheel to avoid 
crossing over detected lane markings.

If the system operates several times without detecting driver response, the system 
beeps to alert you.

■

How the System Works

1

Road Departure Mitigation (RDM) System

*

Important Safety Reminder
Like all assistance systems, the RDM system has 
limitations.
Over-reliance on the RDM system may result in a 
collision. It is always your responsibility to keep the 
vehicle within your driving lane.

The RDM system only alerts you when lane drift is 
detected without a turn signal in use. The RDM 
system may not detect all lane markings or lane or 
roadway departures; accuracy will vary based on 
weather, speed and lane marker condition. It is 
always your responsibility to safely operate the 
vehicle and avoid collisions.

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

2 Front Sensor Camera

*

 P. 370

The RDM system may not work properly or may work 
improperly under the certain conditions:

2 RDM Conditions and Limitations P. 389

There are times when you may not notice RDM 
functions due to your operation of the vehicle, or 
road surface conditions.

* Not available on all models

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When Driving

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Road Departure Mitigation (RDM) System

*

Driving

The system becomes ready to start searching for lane markings when all the 
following conditions are met:
• The vehicle is traveling between about 45 and 90 mph (72 and 145 km/h).
• The vehicle is on a straight or slightly curved road.
• The turn signals are off.
• The brake pedal is not depressed.
• The wipers are not in continuous operation.
• The system makes a determination that the driver is not actively accelerating, 

braking or steering.

■

How the System Activates

1

How the System Activates

The RDM system may automatically shut off and the 

 indicator comes and stays on.

2 Indicators P. 77

RDM system function can be impacted when the 
vehicle is:

•

Not driven within a traffic lane.

•

Driven on the inside edge of a curve, or outside of 
a lane.

•

Driven in a narrow lane.

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