Acura TLX (2021 year). Manual in english - page 27

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Adaptive Cruise Control (ACC) with Low Speed Follow

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■

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. 482

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

2

Front Sensor Camera

 P. 480

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

TM

 

(CMBS

TM

).

2

Collision Mitigation Braking System

TM

 

(CMBS

TM

)

 P. 417

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

2

ACC with Low Speed Follow Conditions 
and Limitations

 P. 436

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

 button.

■

Press the 

 button on the 

steering wheel.

 (white) is on in the 

instrument panel.
ACC with Low Speed 

Follow is ready to use.

How to use

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1

Adaptive Cruise Control (ACC) with Low Speed Follow

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

•

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.

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Adaptive Cruise Control (ACC) with Low Speed Follow

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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 the 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

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. 103

2

Customized Features

 P. 300

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.

On when ACC with Low 

Speed Follow begins

Press down and release

RES/+

/

SET/−

 Switch

 (green) is on.

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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

 (green)

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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. 440

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, a beeper sounds and a message appears 
on the multi-information display, and the head-up 
warning lights

*

 come on.

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

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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 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 the set speed.
There are times when the vehicle speed will decrease when the accelerator pedal is 
lightly applied.

A vehicle icon with dotted-line 

contour appears on the multi-

information display

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. 300

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. 436

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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, depressing the accelerator 
pedal will resume operation of ACC with Low 
Speed Follow 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.

 (green)

 (green)

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Driving

The system may automatically shut off and the 

 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. 480

2

Radar Sensor

 P. 482

■

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.

•

The front grille is dirty.

•

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

•

Tire chains are installed.

■

ACC with Low Speed Follow Conditions and Limitations

1

ACC with Low Speed Follow Conditions and Limitations

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 

 

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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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.

•

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.

•

There are animals in front of your vehicle.

•

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.

1

ACC with Low Speed Follow 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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•

Driving through a metal bridge.

•

The vehicle ahead of you brakes suddenly.

•

The vehicle ahead of you has a unique shape.

•

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.

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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 Low Speed 
Follow 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 audio/information screen or 
multi-information display between mph and km/h.

2

Speed/Distance Units

 P. 103

2

Customized Features

 P. 300

When you depress the accelerator pedal and then 
push and release the 

SET/–

 switch, the current speed 

of the vehicle is set.

To increase speed

To decrease speed

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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 short, 
middle, long, and extra long 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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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 Low 
Speed Follow interval setting.

Following-interval

When the Set Speed is:

50 mph (80 km/h)

65 mph (104 km/h)

Short

83 feet

25 meters

1.1 sec

100 feet

31 meters

1.1 sec

Middle

110 feet

33 meters

1.5 sec

137 feet

42 meters

1.5 sec

Long

154 feet

47 meters

2.1 sec

200 feet

61 meters

2.1 sec

Extra 
Long

204 feet

62 meters

2.8 sec

265 feet

81 meters

2.8 sec

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To cancel ACC with Low Speed Follow, do any 
of the following:

•

Press the 

CANCEL

 button.

u

The 

 indicator (green) on the multi-

information display changes to the 

 

indicator (white).

•

Press the 

 button.

u

 indicator (green) goes off.

•

Depress the brake pedal while the vehicle is 
moving forward.

u

The 

 indicator (green) on the multi-

information display changes to the 

 

indicator (white).

■

To Cancel

1

To Cancel

Resuming the prior set speed: After you have 
canceled ACC with Low Speed Follow, you can 
activate the ACC with Low Speed Follow with the 
prior set speed displayed on the multi-information 
display (in gray) by pressing the 

RES/+

/

SET/–

 switch 

up even if the vehicle is stopped.
When you turn the ACC with Low Speed Follow off 
by pressing the 

CANCEL

 button or depressing the 

brake pedal, the prior set speed is displayed on the 
multi-information display in gray.
When pressing the 

RES/+

/

SET/–

 switch, the ACC 

with Low Speed Follow is activated with displayed 
speed.
Then, when the 

 indicator (white) is displayed and 

you press the 

RES/+

/

SET/–

 switch during the prior 

set speed (in gray) is not displayed, the current vehicle 
speed is set as same as the condition of operating the 

RES/+

/

SET/–

 switch.

CANCEL

 

Button

 Button

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Automatic cancellation

The beeper sounds and a message appears on the multi-information display when 
ACC with Low Speed Follow is automatically canceled. Any of these conditions may 
cause the ACC with Low Speed Follow 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 the vehicle is stopped on a very steep slope.

•

When you manually apply the parking brake.

•

When the detected vehicle within the ACC with Low Speed Follow range is too 
close to your vehicle.

•

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

•

When the Maximum Load Limit is exceeded.

•

The vehicle has repeatedly applied the brakes to maintain the set speed (for 
example, you are descending a long slope).

The ACC with Low Speed Follow 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 engine is turned off.

1

To Cancel

The set speed cannot be set or resumed when ACC 
with Low Speed Follow has been turned off using the 

 button. Press the 

 button to activate the 

system, then set the desired speed.

Adaptive Cruise Control (ACC) 

with Low Speed Follow Indicator 

(White)

Prior Set Speed (Gray)

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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.
The 

 comes on.

•

Green: The system is on.

•

White: The system is standby.

To switch back to ACC with Low Speed 
Follow, press and hold the interval button 
again for one second.

■

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 indicator 

 (green) comes on.

When you use cruise control, 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.

■

To Switch ACC with Low Speed Follow to Cruise Control

1

To Switch ACC with Low Speed Follow 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 audio/information screen or 
multi-information display between mph and km/h.

2

Speed/Distance Units

 P. 103

2

Customized Features

 P. 300

ACC with 

Low Speed 

Follow ON

Cruise 

Control ON

Press and hold the 

interval button

 (white)

 (white)

Interval Button

■

To Set the Vehicle Speed