Get Using the driving support systems -> Dynamic radar cruise control with full-speed range Guide for Toyota Prius 4 Door Fourth Generation (2016-2022)

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4-5. Using the driving support systems

Dynamic radar cruise controlwith full-speed

range^

Summary of functions

In vehicle-to-vehicle distance control mode, the vehicle automatically

accelerates, decelerates and stops to match the speed changes of the

preceding vehicle even if the accelerator pedal is not depressed. In

constant speed control mode, the vehicle runs at a fixed speed.

Use the dynamic radar cruise control with full-speed range on free-

ways and highways.

● Vehicle-to-vehicle distance control mode (P. 319)

● Constant speed control mode (P. 326)

1

Vehicle-to-vehicle

switch

distance

4

2

3

4

5

Indicators

Display

Set speed

Cruise control switch

: If equipped

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WARNING

■Before using dynamic radar cruise control with full-speed range

●Driving safely is the sole responsibility of the driver. Do not rely solely on

the system, and drive safely by always paying careful attention to your sur-

roundings.

●The dynamic radar cruise control with full-speed range provides driving

assistance to reduce the driver’s burden. However, there are limitations to

the assistance provided.

Read the following conditions carefully. Do not overly rely on this system

and always drive carefully.

• When the sensor may not be correctly detecting the vehicle ahead:

P. 328

• Conditions under which the vehicle-to-vehicle distance control mode

may not function correctly: P. 330

●Set the speed appropriately depending on the speed limit, traffic flow, road

conditions, weather conditions, etc. The driver is responsible for checking

the set speed.

●Even when the system is functioning normally, the condition of the preced-

ing vehicle as detected by the system may differ from the condition

observed by the driver. Therefore, the driver must always remain alert,

assess the danger of each situation and drive safely. Relying solely on this

system or assuming the system ensures safety while driving can lead to

an accident, resulting in death or serious injury.

●Switch the dynamic radar cruise control with full-speed range off using the

“ON-OFF” button when not in use.

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WARNING

■Cautions regarding the driving assist systems

Observe the following precautions, as there are limitations to the assistance

provided by the system.

Failure to do so may cause an accident resulting in death or serious injury.

●Assisting the driver to measure following distance

The dynamic radar cruise control with full-speed range is only intended to

help the driver in determining the following distance between the driver’s

own vehicle and a designated vehicle traveling ahead. It is not a mecha-

nism that allows careless or inattentive driving, and it is not a system that

can assist the driver in low-visibility conditions. It is still necessary for

driver to pay close attention to the vehicle’s surroundings.

●Assisting the driver to judge proper following distance

The dynamic radar cruise control with full-speed range determines

whether the following distance between the driver’s own vehicle and a

designated vehicle traveling ahead is within a set range. It is not capable

of making any other type of judgement. Therefore, it is absolutely neces-

sary for the driver to remain vigilant and to determine whether or not there

is a possibility of danger in any given situation.

4

●Assisting the driver to operate the vehicle

The dynamic radar cruise control with full-speed range does not include

functions which will prevent or avoid collisions with vehicles ahead of your

vehicle. Therefore, if there is ever any possibility of danger, the driver must

take immediate and direct control of the vehicle and act appropriately in

order to ensure the safety of all involved.

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WARNING

■Situations unsuitable for dynamic radar cruise control with full-speed

range

Do not use dynamic radar cruise control with full-speed range in any of the

following situations.

Doing so may result in inappropriate speed control and could cause an acci-

dent resulting in death or serious injury.

●Roads where there are pedestrians, cyclists, etc.

●In heavy traffic

●On roads with sharp bends

●On winding roads

●On slippery roads, such as those covered with rain, ice or snow

●On steep downhills, or where there are sudden changes between sharp up

and down gradients

Vehicle speed may exceed the set speed when driving down a steep hill.

●At entrances to freeways and highways

●When weather conditions are bad enough that they may prevent the sen-

sors from detecting correctly (fog, snow, sandstorm, heavy rain, etc.)

●When there is rain, snow, etc. on the front surface of the radar sensor or

camera sensor

●In traffic conditions that require frequent repeated acceleration and decel-

eration

●During emergency towing

●When an approach warning buzzer is heard often

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4-5. Using the driving support systems

Driving in vehicle-to-vehicle distance control mode

This mode employs a radar sensor to detect the presence of vehicles

up to approximately 328 ft. (100 m) ahead, determines the current

vehicle-to-vehicle following distance, and operates to maintain a suit-

able following distance from the vehicle ahead.

Note that vehicle-to-vehicle distance will close in when traveling on long

downhill slopes.

4

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4-5. Using the driving support systems

1

Example of constant speed cruising

When there are no vehicles ahead

The vehicle travels at the speed set by the driver. The desired vehicle-to-

vehicle distance can also be set by operating the vehicle-to-vehicle dis-

tance switch.

2

Example of deceleration cruising and follow-up cruising

When a preceding vehicle driving slower than the set speed

appears

When a vehicle is detected running ahead of you, the system automatically

decelerates your vehicle. When a greater reduction in vehicle speed is

necessary, the system applies the brakes (the stop lights will come on at

this time). The system will respond to changes in the speed of the vehicle

ahead in order to maintain the vehicle-to-vehicle distance set by the driver.

Approach warning warns you when the system cannot decelerate suffi-

ciently to prevent your vehicle from closing in on the vehicle ahead.

When the vehicle ahead of you stops, your vehicle will also stop (vehicle is

stopped by system control). After the vehicle ahead starts off, pushing the

cruise control lever up or depressing the accelerator pedal will resume fol-

low-up cruising.

3

Example of acceleration

When there are no longer any preceding vehicles driving slower

than the set speed

The system accelerates until the set speed is reached. The system then

returns to constant speed cruising.

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4-5. Using the driving support systems

Setting the vehicle speed (vehicle-to-vehicle distance control

mode)

1

Press the “ON-OFF” button to

activate the cruise control.

Radar cruise control indicator will

come on and a message will be

displayed on the multi-information

display.

Press the button again to deacti-

vate the cruise control.

If the “ON-OFF” button is pressed

and held for 1.5 seconds or more,

the system turns on in constant

speed control mode. (P. 326)

2

Accelerate or decelerate, with

accelerator pedal operation, to

the desired vehicle speed (at or

above approximately 30 mph

[50 km/h]) and push the lever

down to set the speed.

4

Cruise control “SET” indicator will

come on.

The vehicle speed at the moment

the lever is released becomes the

set speed.

If the lever is operated while the vehicle speed is below approximately 30

mph (50 km/h) and a preceding vehicle is present, the set speed will be

adjusted to approximately 30 mph (50 km/h).

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Adjusting the set speed

4-5. Using the driving support systems

To change the set speed, operate the lever until the desired set speed

is displayed.

1

Increases the speed

(Except when the vehicle has been

stopped by system control in vehi-

cle-to-vehicle distance control

mode)

2

Decreases the speed

Fine adjustment: Momentarily

move the lever in the desired

direction.

Large adjustment: Hold the lever up or down to change the speed,

and release when the desired speed is reached.

In the vehicle-to-vehicle distance control mode, the set speed will be

increased or decreased as follows:

 For the U.S. mainland, Hawaii

Fine adjustment: By 1 mph (1.6 km/h)*¹or 1 km/h (0.6 mph)*²each time

the lever is operated

^{Large adjustment: Increases or decreases in 1 mph (1.6 km/h)}*¹or 1 km/h

^{(0.6 mph)}*²increments for as long as the lever is held

 For Canada, Guam, Saipan and Puerto Rico

Fine adjustment: By 1 mph (1.6 km/h)*¹or 1 km/h (0.6 mph)*²each time

the lever is operated

^{Large adjustment: Increases or decreases in 5 mph (8 km/h)}*¹or 5 km/h

^{(3.1 mph)}*²increments for as long as the lever is held

In the constant speed control mode (P. 326), the set speed will be

increased or decreased as follows:

Fine adjustment: By 1 mph (1.6 km/h)*¹or 1 km/h (0.6 mph)*²each time

the lever is operated

Large adjustment: The speed will continue to change while the lever is

held.

*¹: When the set speed is shown in “MPH”

*²: When the set speed is shown in “km/h”

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4-5. Using the driving support systems

Changing the vehicle-to-vehicle distance (vehicle-to-vehicle dis-

tance control mode)

Pressing the switch changes the

Preceding

vehicle-to-vehicle distance as fol-

vehicle mark

lows:

1

Long

2

Medium

3

Short

The vehicle-to-vehicle distance is

set automatically to long mode

when the power switch is turned to

ON mode.

If a vehicle is running ahead of you, the preceding vehicle mark will also be

displayed.

4

Vehicle-to-vehicle distance settings (vehicle-to-vehicle distance

control mode)

Select a distance from the table below. Note that the distances shown

correspond to a vehicle speed of 50 mph (80 km/h). Vehicle-to-vehicle

distance increases/decreases in accordance with vehicle speed.

When the vehicle is stopped by system control, the vehicle stops at a

certain vehicle-to-vehicle distance depending on the situation.

Distance options

Long

Vehicle-to-vehicle distance

Approximately 160 ft. (50 m)

Approximately 130 ft. (40 m)

Approximately 100 ft. (30 m)

Medium

Short

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4-5. Using the driving support systems

Resuming follow-up cruising when the vehicle has been stopped

by system control (vehicle-to-vehicle distance control mode)

After the vehicle ahead of you

starts off, push the lever up.

Your vehicle will also resume fol-

low-up cruising if the accelerator

pedal is depressed after the vehi-

cle ahead of you starts off.

Canceling and resuming the speed control

1

Pulling the lever toward you

cancels the speed control.

The speed control is also canceled

when

the

brake

pedal

is

depressed.

(When the vehicle has been

stopped by system control,

depressing the brake pedal does

not cancel the setting.)

2

Pushing the lever up resumes the cruise control and returns vehicle

speed to the set speed.

However, when a vehicle ahead is not detected, cruise control does not

resume when the vehicle speed is approximately 25 mph (40 km/h) or less.

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Approach warning (vehicle-to-vehicle distance control mode)

When your vehicle is too close to

a vehicle ahead, and sufficient

automatic deceleration via the

cruise control is not possible, the

display will flash and the buzzer

will sound to alert the driver. An

example of this would be if

another driver cuts in front of you

while you are following a vehicle.

Depress the brake pedal to

ensure an appropriate vehicle-to-

vehicle distance.

■ Warnings may not occur when

4

In the following instances, warnings may not occur even when the

vehicle-to-vehicle distance is small.

● When the speed of the preceding vehicle matches or exceeds

your vehicle speed

● When the preceding vehicle is traveling at an extremely slow

speed

● Immediately after the cruise control speed was set

● When depressing the accelerator pedal

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Selecting constant speed control mode

When constant speed control mode is selected, your vehicle will main-

tain a set speed without controlling the vehicle-to-vehicle distance.

Select this mode only when vehicle-to-vehicle distance control mode

does not function correctly due to a dirty radar sensor, etc.

1

With the cruise control off,

press and hold the “ON-OFF”

button for 1.5 seconds or more.

Immediately after the “ON-OFF”

button is pressed, the radar cruise

control indicator will come on.

Afterwards, it switches to the cruise

control indicator.

Switching to constant speed con-

trol mode is only possible when

operating the lever with the cruise

control off.

2

Accelerate or decelerate, with

accelerator pedal operation, to

the desired vehicle speed (at or

above approximately 25 mph

[40 km/h]) and push the lever

down to set the speed.

Cruise control “SET” indicator will

come on.

The vehicle speed at the moment

the lever is released becomes the

set speed.

Adjusting the speed setting: P. 322

Canceling and resuming the speed setting: P. 324

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4-5. Using the driving support systems

■Dynamic radar cruise control with full-speed range can be set when

●The shift position is in D.

●Vehicle speed is at or above approximately 30 mph (50 km/h).

However, when a preceding vehicle is detected, the dynamic radar cruise

control with full-speed range can be set even if the vehicle speed is below

approximately 30 mph (50 km/h).

■Accelerating after setting the vehicle speed

The vehicle can accelerate by operating the accelerator pedal. After acceler-

ating, the set speed resumes. However, during vehicle-to-vehicle distance

control mode, the vehicle speed may decrease below the set speed in order

to maintain the distance to the preceding vehicle.

■When the vehicle stops while follow-up cruising

●Pushing the lever up while the vehicle ahead stops will resume follow-up

cruising if the vehicle ahead starts off within approximately 3 seconds after

the lever is pushed up.

●If the vehicle ahead starts off within 3 seconds after your vehicle stops, fol-

low-up cruising will be resumed.

4

■Automatic cancelation of vehicle-to-vehicle distance control mode

Vehicle-to-vehicle distance control mode is automatically canceled in the fol-

lowing situations:

●Actual vehicle speed falls at or below approximately 25 mph (40 km/h) when

there are no vehicles ahead.

●The preceding vehicle leaves the lane when your vehicle is following at a

vehicle speed at or below approximately 25 mph (40 km/h). Otherwise, the

sensor can not properly detect the vehicle.

●VSC is activated.

●TRAC is activated for a period of time.

●When the VSC or TRAC system is turned off.

●The sensor cannot detect correctly because it is covered in some way.

●Pre-collision braking is activated.

●Parking Support Brake function is operated. (if equipped)

●The parking brake is operated.

●The vehicle is stopped by system control on a steep incline.

●The following are detected when the vehicle has been stopped by system

control:

• The driver is not wearing a seat belt.

• The driver’s door is opened.

• The vehicle has been stopped for about 3 minutes.

In this situation, the shift position may automatically switch to P. (P. 254)

If vehicle-to-vehicle distance control mode is automatically canceled for any

other reason, there may be a malfunction in the system. Contact your Toyota

dealer.

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■Automatic cancelation of constant speed control mode

Constant speed control mode is automatically canceled in the following situa-

tions:

●Actual vehicle speed is more than approximately 10 mph (16 km/h) below

the set vehicle speed.

●Actual vehicle speed falls below approximately 25 mph (40 km/h).

●VSC is activated.

●TRAC is activated for a period of time.

●When the VSC or TRAC system is turned off.

●Pre-collision braking is activated.

●Parking Support Brake function is operated. (if equipped)

If constant speed control mode is automatically canceled for any other rea-

son, there may be a malfunction in the system. Contact your Toyota dealer.

■Brake system operation sound

If the brakes are applied automatically while the vehicle is in vehicle-to-vehi-

cle distance control mode, a brake system operation sound may be heard.

This does not indicate a malfunction.

■Warning messages and buzzers for dynamic radar cruise control with

full-speed range

Warning messages and buzzers are used to indicate a system malfunction or

to inform the driver of the need for caution while driving. If a warning message

is shown on the multi-information display, read the message and follow the

instructions.

■When the sensor may not be correctly detecting the vehicle ahead

In the case of the following and depending on the conditions, operate the

brake pedal when deceleration of the system is insufficient or operate the

accelerator pedal when acceleration is required.

As the sensor may not be able to correctly detect these types of vehicles, the

approach warning (P. 325) may not be activated.

●Vehicles that cut in suddenly

●Vehicles traveling at low speeds

●Vehicles that are not moving in the same lane

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●Vehicles with small rear ends (trailers with no load on board, etc.)

●Motorcycles traveling in the same lane

●When water or snow thrown up by the surrounding vehicles hinders the

detecting of the sensor

●When your vehicle is pointing upwards

(caused by a heavy load in the luggage

compartment, etc.)

4

●Preceding vehicle has an extremely high

ground clearance

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■Conditions under which the vehicle-to-vehicle distance control mode

may not function correctly

In the case of the following conditions, operate the brake pedal (or accelera-

tor pedal, depending on the situation) as necessary.

As the sensor may not be able to correctly detect vehicles ahead, the system

may not operate properly.

●When the road curves or when the lanes

are narrow

●When steering wheel operation or your

position in the lane is unstable

●When the vehicle ahead of you decelerates suddenly

●When driving on a road surrounded by a structure, such as in a tunnel or on

a bridge

●While the vehicle speed is decreasing to the set speed after the vehicle

accelerates by depressing the accelerator pedal

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Using the driving support systems -> Dynamic radar cruise control with full-speed range for Your Toyota Prius 4 Door Fourth Generation (2016-2022)

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