Toyota Prius Prime (2020 year). Owner's manual — part 26

408

5-5. Using the driving support systems

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.

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.

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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5-5. Using the driving support systems

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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. 414)

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.

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).

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

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2

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5-5. Using the driving support systems

To change the set speed, operate the lever until the desired set speed
is displayed.

Increases the speed

(Except when the vehicle has been
stopped by system control in vehi-
cle-to-vehicle

distance

control

mode)

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 and Hawaii

Fine adjustment: By 1 mph (1.6 km/h)

*

1

or 1 km/h (0.6 mph)

*

2

each time

the lever is operated
Large adjustment: Increases or decreases in 1 mph (1.6 km/h)

*

1

or 1 km/h

(0.6 mph)

*

2

increments for as long as the lever is held



For Canada

Fine adjustment: By 1 mph (1.6 km/h)

*

1

or 1 km/h (0.6 mph)

*

2

each time

the lever is operated
Large adjustment: Increases or decreases in 5 mph (8 km/h)

*

1

or 5 km/h

(3.1 mph)

*

2

increments for as long as the lever is held

In the constant speed control mode (

P. 414), the set speed will be

increased or decreased as follows:

Fine adjustment: By 1 mph (1.6 km/h)

*

1

or 1 km/h (0.6 mph)

*

2

each 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”

Adjusting the set speed

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5-5. Using the driving support systems

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Pressing the switch changes the
vehicle-to-vehicle distance as fol-
lows:

Long
Medium
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.

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.

Changing the vehicle-to-vehicle distance (vehicle-to-vehicle dis-
tance control mode)

Preceding
vehicle mark

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2

3

Vehicle-to-vehicle distance settings (vehicle-to-vehicle distance
control mode)

Distance options

Vehicle-to-vehicle distance

Long

Approximately 160 ft. (50 m)

Medium

Approximately 130 ft. (40 m)

Short

Approximately 100 ft. (30 m)

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5-5. Using the driving support systems

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.

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.)

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.

Resuming follow-up cruising when the vehicle has been stopped
by system control (vehicle-to-vehicle distance control mode)

Canceling and resuming the speed control

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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
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

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

414

5-5. Using the driving support systems

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.

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.

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. 410

Canceling and resuming the speed setting:

P. 412

Selecting constant speed control mode

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■

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.

■

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. 345)

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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5-5. Using the driving support systems

■

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.

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■

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. 413) may not be activated.

●

Vehicles that cut in suddenly

●

Vehicles traveling at low speeds

●

Vehicles that are not moving in the same lane

●

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.)

●

Preceding vehicle has an extremely high
ground clearance

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5-5. Using the driving support systems

■

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 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

●

When the road curves or when the lanes
are narrow

●

When steering wheel operation or your
position in the lane is unstable

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5-5. Using the driving support systems

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Driving mode select switch

Repeatedly press the switch until the system changes to the intended
driving mode.

Each time the switch is pressed, the driving mode changes in the following
order and the “ECO MODE” and “PWR MODE” indicators turn on or off
accordingly.

In response to driving conditions, one of 3 driving modes can be
selected.

Driving modes

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5-5. Using the driving support systems

Normal mode
Suitable for normal driving.

When normal mode is selected, the “ECO MODE” and “PWR MODE”
indicators turn off.

Power mode
Suitable for when crisp handling and enhanced accelerator
response are desired, such as when driving on mountainous roads.

When power mode is selected, the “PWR MODE” indicator will illumi-
nate on the main display.

Eco drive mode
Suitable for driving that improves fuel economy by generating
torque in response to accelerator pedal operations more smoothly
than in normal mode.

When Eco drive mode is selected, the “ECO MODE” indicator will illumi-
nate on the main display.
While the air conditioning is being used, the system automatically
switches to air conditioning eco mode (

P. 503, 514), allowing for driv-

ing that leads to even better fuel economy.

■

The driving mode after turning the power switch off
The driving mode will not be changed automatically until the switch is
pressed, even if the power switch is turned off.

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BSM (Blind Spot Monitor)



The Blind Spot Monitor is a system that has 2 functions;
● The Blind Spot Monitor function

Assists the driver in making the decision when changing lanes

● The Rear Cross Traffic Alert function

Assists the driver when backing up

These functions use same sensors.

Outside rear view mirror indicators

Blind Spot Monitor function:
When a vehicle is detected in the blind spot, the outside rear view mirror
indicator comes on while the turn signal lever is not operated. If the turn
signal lever is operated toward the detected side, the outside rear view
mirror indicator flashes.
Rear Cross Traffic Alert function:
When a vehicle approaching from the right or left rear of the vehicle is
detected, the outside rear view mirror indicators flash.



: If equipped

Summary of the Blind Spot Monitor

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5-5. Using the driving support systems

The Blind Spot Monitor on/off screen and indicator

The Blind Spot Monitor function and Rear Cross Traffic Alert function can
be switched on and off using the multi-information display. (

P. 244)

When switched on, the BSM indicator illuminates on the meter and the
buzzer sounds.

Rear Cross Traffic Alert buzzer (Rear Cross Traffic Alert function
only)

When a vehicle approaching from the right or left rear of the vehicle is
detected, a buzzer sounds from the driver’s side instrument panel.

RCTA detection display (RCTA function only)

If a vehicle approaching from the right or left at the rear of the vehicle is
detected, the RCTA detection display will be displayed on the multi-infor-
mation display.

The Blind Spot Monitor function and Rear Cross Traffic Alert function

can be enabled/disabled on the

screen (

P. 244) of the multi-

information display.

Once the systems are disabled, the systems will not be enabled until they

are enabled by the

screen of multi-information display again. (The

systems are not automatically enabled even when the hybrid system is
restarted.)

Changing settings of the Blind Spot Monitor function and Rear
Cross Traffic Alert function

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■

The BSM outside rear view mirror indicators visibility
When under strong sunlight, the outside rear view mirror indicator may be dif-
ficult to see.

■

The Rear Cross Traffic Alert buzzer hearing
The Rear Cross Traffic Alert buzzer may be difficult to hear over loud noises
such as high audio volume.

■

When “Blind Spot Monitor Unavailable” is shown on the multi-informa-
tion display
The sensor voltage has become abnormal, water, snow mud, etc., may be
built up in the vicinity of the sensor area of bumper (

P. 424). Removing the

water, snow, mud, etc., from the vicinity of the sensor area bumper should
return it to normal. Also, the sensor may not function normally when used in
extremely hot or cold weather.

■

When “Blind Spot Monitor System Malfunction Visit Your Dealer” is
shown on the multi-information display
There may be a sensor malfunction or misaligned. Have the vehicle
inspected by your Toyota dealer.

■

Certification for the Blind Spot Monitor



For vehicles sold in the U.S.A. and Hawaii



For vehicles sold in Canada