Acura RLX (2018 year). Manual - part 26

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When Driving

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Adaptive Cruise Control (ACC) with Low Speed Follow (LSF)

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. 402

■

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 with LSF Conditions and Limitations

1

ACC with LSF Conditions and Limitations

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

TM

 (CMBS

TM

).

2 Collision Mitigation Braking System

TM

 

(CMBS

TM

) P. 460

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

2 Front Sensor Camera P. 402

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.

Do not put a sticker on the radar sensor cover or 
replace the radar sensor cover.

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 MAIN 
button and take your vehicle to a dealer.

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) with Low Speed Follow (LSF)

410

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 or pedestrian 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.

1

ACC with LSF Conditions and Limitations

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.

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Adaptive Cruise Control (ACC) with Low Speed Follow (LSF)

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 the switch pressed 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 LSF may not 
accelerate your vehicle. This is to maintain the set 
following-interval between your vehicle and the 
vehicle ahead.

To increase speed

To decrease speed

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Adaptive Cruise Control (ACC) with Low Speed Follow (LSF)

Driving

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

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) with Low Speed Follow (LSF)

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.

When your vehicle stops automatically because a vehicle detected ahead of you has 
stopped, the interval between the two vehicles will vary based on the ACC with LSF 
interval setting.

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

204 feet

62 meters

2.8 sec

265 feet

81 meters

2.8 sec

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Adaptive Cruise Control (ACC) with Low Speed Follow (LSF)

414

Driving

To cancel ACC with LSF, do any of the 
following:
• Press the CANCEL button.
• Press the MAIN button.

u

ACC with LSF indicator goes off.

• Depress the brake pedal.

u

When the LSF function has stopped the 
vehicle, you cannot cancel ACC with LSF 
by depressing the brake pedal.

■

To Cancel

1

To Cancel

Resuming the prior set speed: After you have 
canceled ACC with LSF, you can resume the prior set 
speed while it is still displayed. Press the RES/+/SET/
– switch up.

The set speed cannot be set or resumed when ACC 
with LSF 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) with Low Speed Follow (LSF)

Driving

■

Automatic cancellation

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

TM

 is activated.

• When the ABS or VSA® system indicator comes on.
• When the vehicle is stopped on a very steep slope.
• When you manually apply the parking brake.
• When the detected vehicle within the ACC with LSF range is too close to your 

vehicle.

• The camera behind the rearview mirror, or the area around the camera, including 

the windshield, gets dirty.

The ACC with LSF automatic cancellation can be also triggered by the following 
causes. In these cases, the parking brake will be automatically applied.
• The driver’s seat belt is unfastened when the vehicle is stationary.
• The vehicle stops for more than 10 minutes.
• The power system is turned off.

1

Automatic cancellation

Even though ACC with LSF has been automatically 
canceled, you can still resume the prior set speed. 
Wait until the condition that caused ACC with LSF to 
cancel improves, then press the RES/+/SET/– switch 
up.

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Adaptive Cruise Control (ACC) with Low Speed Follow (LSF)

416

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 with LSF, press and 
hold the   (interval) 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 RES/+/SET/– switch down when you 
reach the desired speed.
The moment you release the RES/+/SET/– switch, the set speed is fixed, and cruise 
control begins. The CRUISE CONTROL indicator comes on.

Each time you press the RES/+/SET/– switch up or down, the vehicle speed is 
increased or decreased by about 1 mph (1.6 km/h).
If you keep the RES/+/SET/– switch pressed up or down, the vehicle speed increases 
or decreases until you release it. This speed is then set.

■

To Switch ACC with LSF to Cruise Control

1

To Switch ACC with LSF 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.

ACC with 
LSF ON

Cruise 
Control ON

■

To Set the Vehicle Speed

■

To Adjust the Vehicle Speed

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Adaptive Cruise Control (ACC) with Low Speed Follow (LSF)

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/+/
SET/– switch up 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.

2 Customized Features P. 297

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.

■

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. 402

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

2 RDM Conditions and Limitations P. 421

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

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Road Departure Mitigation (RDM) System

Driving

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.

1

Road Departure Mitigation (RDM) System

If LKAS is off and you have selected Narrow from the 
customized options using the audio/information 
screen, the message below will appear in case the 
system determines a possibility of your vehicle 
crossing over detected lane markings.

2 Customized Features P. 297

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Road Departure Mitigation (RDM) System

420

Driving

The system becomes ready to start searching for lane markings when all the 
following conditions are met:
• The vehicle is traveling between 45 and 89 mph (72 and 144 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.

Press the RDM button to turn the system on 
and off.

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The indicator in the button comes on and 
the message appears on the multi-
information display when the system is 
on.

■

How the System Activates

■

RDM On and Off

1

How the System Activates

The RDM system may automatically shut off and the 

 indicator comes and stays on.

2 Indicators P. 76

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.

1

RDM On and Off

When you have selected Warning Only from the 
customized options using the audio/information 
screen, the system does not operate the steering 
wheel and braking.

2 Customized Features P. 297

RDM Button

Indicator

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Road Departure Mitigation (RDM) System

Continued

Driving

The system may not properly detect lane markings and the position of your vehicle 
under certain conditions. Some examples of these conditions are listed below.

■

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 lane lines and the roadway surface.
• 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.
• Shadows of adjacent objects are parallel to lane markings.
• Roadway objects or structures are misinterpreted as lane markers.
• Reflections on the interior of the windshield.
• Driving at night or in a dark condition such as a tunnel.

■

RDM Conditions and Limitations

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Road Departure Mitigation (RDM) System

Driving

■

Roadway conditions

• Driving on a snowy or wet roadway (obscured lane marking, vehicle tracks, 

reflected lights, road spray, high contrast).

• Driving on a road with temporary lane markings.
• Faint, multiple, or varied lane markings are visible on the roadway due to road 

repairs or old lane markings.

• The roadway has merging, split, or crossing lines (e.g., such as at an intersection 

or crosswalk).

• The lane markings are extremely narrow, wide, or changing.
• The vehicle in front of you is driving near the lane lines.
• The road is hilly or the vehicle is approaching the crest of a hill.
• Driving on rough or unpaved roads, or over bumpy surfaces.
• When objects on the road (curb, guard rail, pylons, etc.) are recognized as white 

lines (or yellow lines).

• Driving on roads with double lines.
• The road has ruts.

■

Vehicle conditions

• Headlight lenses are dirty or the headlights are not properly adjusted.
• The outside of the windshield is streaked or blocked by dirt, mud, leaves, wet 

snow, etc.

• The inside of the windshield is fogged.
• The camera temperature gets too high.
• An abnormal tire or wheel condition (wrong sized, varied size or construction, 

improperly inflated, compact spare tire

*

, etc.).

• The vehicle is tilted due to a heavy load or suspension modifications.
• When tire chains are installed.

* Not available on all models

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Lane Keeping Assist System (LKAS)

Continued

Driving

Lane Keeping Assist System (LKAS)

Provides steering input to help keep the vehicle in the middle of a detected lane and 
provides tactile and visual alerts if the vehicle is detected drifting out of its lane.

1

Lane Keeping Assist System (LKAS)

Important Safety Reminders
The LKAS is for your convenience only. It is not a 
substitute for your vehicle control. The system does 
not work if you take your hands off the steering 
wheel or fail to steer the vehicle.

2 Multi-Information Display Warning and 

Information Messages P. 94

Do not place objects on the instrument panel. 
Objects may reflect on the front windshield and 
prevent correct detection of the traffic lanes.

The LKAS only alerts you when lane drift is detected 
without a turn signal in use. The LKAS may not detect 
all lane markings or lane 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.

The LKAS is convenient when it is used on freeways.

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

2 LKAS Conditions and Limitations P. 428

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

2 Front Sensor Camera P. 402

When you operate the turn signals to change lanes, the system is suspended, and 
resumes after the signals are off.
() If you make a lane change without operating the turn signals, the LKAS 
alerts activate, and torque is applied to the steering.

■

LKAS camera

Monitors the lane 
lines

■

Tactile and visual alerts

Rapid vibrations on the steering 
wheel and a warning display alert you 
that the vehicle is drifting out of a 
detected lane.

■

Steering input assist

The system applies torque to the steering to keep the vehicle between the left and 
right lane lines. The applied torque becomes stronger as the vehicle gets closer to 
either of the lane lines.

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When Driving

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Lane Keeping Assist System (LKAS)

424

Driving

Provides assistance to keep the vehicle in the center of the lane. When the vehicle 
nears a white or yellow line, steering force of the electric power steering will become 
stronger.

When the vehicle enters the warning area, the LKAS alerts you with slight steering 
wheel vibration as well as a warning display.

■

Lane Keep Support Function

1

Lane Keeping Assist System (LKAS)

The LKAS may not function as designed while driving 
in frequent stop and go traffic, or on roads with 
sharp curves.

When it fails to detect lanes, the system will 
temporarily be canceled. When lane is detected, 
system will recover automatically.

■

Lane Departure Warning Function

Warning Area

Warning Area

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