Toyota Prius Prime (2021 year). Manual in english - part 7

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●

Vehicle sway warning function
This function operates when all of the following conditions are met.

• Setting for 

 (“Lane Sway Warning Status”) in 

 of the multi-

information display is set to “On”. (



P. 220)

• Vehicle speed is approximately 32 mph (50 km/h) or more.
• Width of traffic lane is approximately 9.8 ft. (3 m) or more.
• No system malfunctions are detected. (



P. 409)

●

Lane centering function
This function operates when all of the following conditions are met.
• LTA is turned on.
• Setting for 

 (“LTA Steering Assist Mode”) and 

 (“Center

Trace”) in 

 of the multi-information display are set to “On”. (



P. 220)

• This function recognizes white (yellow) lane lines or the position of a pre-

ceding  vehicle  (except  when  the  preceding  vehicle  is  small,  such  as  a
motorcycle).

• The  dynamic  radar  cruise  control  with  full-speed  range  is  operating  in

vehicle-to-vehicle distance control mode.

• Width of traffic lane is approximately 10 to 13 ft. (3 to 4 m).
• Turn signal lever is not operated.
• Vehicle is not being driven around a sharp curve.
• No system malfunctions are detected. (



P. 409)

• Vehicle does not accelerate or decelerate by a fixed amount or more.
• Steering  wheel  is  not  operated  with  a  steering  force  level  suitable  for

changing lanes.

• ABS, VSC, TRAC and PCS are not operating.
• TRAC or VSC is not turned off.
• Hands off steering wheel warning is not displayed. (



P. 408)

• The vehicle is being driven in the center of a lane.
• Steering assist function is not operating.

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■

Temporary cancelation of functions

●

When operation conditions are no longer met, a function may be temporarily
canceled. However, when the operation conditions are met again, operation
of the function is automatically restored. (



P. 405)

●

If the operation conditions (



P. 406) are no longer met while the lane cen-

tering function is operating, the buzzer may sound to indicate that the func-
tion has been temporarily canceled.

■

Steering assist function/lane centering function

●

Depending on the vehicle speed, lane departure situation, road conditions,
etc., the driver may not feel the function is operating or the function may not
operate at all.

●

The  steering  control  of  the  function  is  overridden  by  the  driver’s  steering
wheel operation.

●

Do not attempt to test the operation of the steering assist function.

■

Lane departure alert function

●

The  warning  buzzer  may  be  difficult  to  hear  due  to  external  noise,  audio
playback, etc.

●

If the edge of the course

*

 is not clear or straight, the lane departure alert

function may not operate.

●

Do not attempt to test the operation of the lane departure alert function.

*

: Boundary between asphalt and the side of the road, such as grass, soil, or

a curb

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■

Hands off steering wheel warning

●

When  the  system  determines  that  the  driver  is  driving  without  holding  the
steering wheel while the system is operating
If  the  driver  continues  to  keep  their  hands  off  of  the  steering  wheel,  the
buzzer  sounds,  the  driver  is  warned  and  the  function  is  temporarily  can-
celed. This warning also operates in the same way when the driver continu-
ously operates the steering wheel only a small amount.

●

When  the  system  determines  that  the  vehicle  may  deviate  from  the  lane
while driving around a curve while the lane centering function is operating
Depending on the vehicle condition and road conditions, the warning may
not  operate.  Also,  if  the  system  determines  that  the  vehicle  is  driving
around a curve, warnings will occur earlier than during straight-lane driving.

●

When  the  system  determines  that  the  driver  is  driving  without  holding  the
steering wheel while the steering wheel assist of the steering assist function
is operating.
If the driver continues to keep their hands off of the steering wheel and the
steering  wheel  assist  is  operating,  the  buzzer  sounds  and  the  driver  is
warned.  Each  time  the  buzzer  sounds,  the  continuing  time  of  the  buzzer
becomes longer.

■

Vehicle sway warning function

In the following situations, a warning mes-
sage urging the driver to hold the steering
wheel and the symbol shown in the illus-
tration are displayed on the multi-informa-
tion  display  to  warn  the  driver.  The
warning  stops  when  the  system  deter-
mines  that  the  driver  holds  the  steering
wheel.  Always  keep  your  hands  on  the
steering  wheel  when  using  this  system,
regardless of warnings.

When  the  system  determines  that  the
vehicle is swaying while the vehicle sway
warning  function  is  operating,  a  buzzer
sounds  and  a  warning  message  urging
the driver to rest and the symbol shown in
the  illustration  are  simultaneously  dis-
played on the multi-information display.
Depending on the vehicle and road condi-
tions, the warning may not operate.

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■

Warning message

If the following warning message is displayed on the multi-information display
and  the  LTA  indicator  illuminates  in  orange,  follow  the  appropriate  trouble-
shooting procedure. Also, if a different warning message is displayed, follow
the instructions displayed on the screen.

●

“LTA Malfunction Visit Your Dealer” 
The system may not be operating properly. Have the vehicle inspected by
your Toyota dealer.

●

“LTA Unavailable” 
The system is temporarily canceled due to a malfunction in a sensor other
than the  front  camera. Turn  the  LTA  system off,  wait for a  little  while,  and
then turn the LTA system back on.

●

“LTA Unavailable at Current Speed” 
The function cannot be used as the vehicle speed exceeds the LTA opera-
tion range. Drive slower.

■

Customization

Function settings can be changed.
(Customizable features:



P. 246)

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RSA (Road Sign Assist)



The RSA system recognizes spe-
cific  road  signs  using  the  front
camera  to  provide  information  to
the driver via the display.

If the system judges that the vehicle is being driven over the  speed
limit, performing prohibited actions, etc. according to the recognized
road signs, it notifies the driver through a visual notification and notifi-
cation buzzer.



: If equipped

Summary of function

WARNING

■

Before using the RSA

Do not rely solely upon the RSA system. RSA is a system which supports
the driver by providing information, but it is not a replacement for a driver’s
own vision and awareness. Drive safely by always paying careful attention
to the traffic rules.

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When the front camera recognizes a sign, the sign will be displayed
on the main display or multi-information display.

●

When the driving assist system
information is selected in multi-
information display, a maximum
of 2 signs can be displayed on
the  multi-information  display.
(



P. 220)

●

When a tab other than the driv-
ing assist system information is
selected, the following types of
road signs will be displayed on
the main display. (



P. 209)

• Speed limit sign
• Do  Not  Enter  sign  (when

notification is necessary)

If signs other than speed limit signs are recognized, they will be displayed
in an overlapping stack under the current speed limit sign.

The following types of road signs, including electronic signs and blink-
ing signs, are recognized.

A non-official or a recently introduced traffic sign may not be recognized.

Indication on the main display or multi-information display

Supported types of road signs

Speed limit

Do Not Enter

Stop

Yield

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In the following situations, the RSA system will notify the driver.

●

When the vehicle speed exceeds the speed notification threshold of
the speed limit sign displayed, the sign display will be emphasized
and a buzzer will sound.

●

When the RSA system recognizes a do not enter sign and deter-
mines that your vehicle has entered a no-entry area, the displayed
sign will flash and a buzzer will sound.

Depending  on  the  situation,  a  notification  function  may  not  operate
properly.

■

Setting procedure



P. 246

■

Automatic turn-off of RSA sign display

In  the  following  situations,  a  displayed speed  limit  sign  and/or  do  not  enter
sign will stop being displayed automatically:

●

No sign has been recognized for a certain distance.

●

The road changes due to a left or right turn, etc.

In the following situations, stop and yield signs will stop being displayed auto-
matically:

●

The system determines that your vehicle has passed the sign.

●

The road changes due to a left or right turn, etc.

■

Conditions in which the function may not operate or detect correctly

In the following situations, RSA does not operate normally and may not rec-
ognize signs, display the incorrect sign, etc. However, this does not indicate a
malfunction.

●

The front camera is misaligned due to a strong impact being applied to the
sensor, etc.

●

Dirt, snow, stickers, etc. are on the windshield near the front camera.

●

In inclement weather such as heavy rain, fog, snow or sand storms

●

Light from an oncoming vehicle, the sun, etc. enters the front camera.

●

The sign is dirty, faded, tilted or bent.

●

The contrast of electronic sign is low.

●

All or part of the sign is hidden by the leaves of a tree, a pole, etc.

●

The sign is only visible to the front camera for a short amount of time.

●

The driving scene (turning, lane change, etc.) is judged incorrectly.

●

If a sign not appropriate for the currently traveled lane, but the sign exists
directly after a freeway branches, or in an adjacent lane just before merging.

●

Stickers are attached to the rear of the preceding vehicle.

Notification function

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●

A sign resembling a system compatible sign is recognized.

●

Side road speed signs may be detected and displayed (if positioned in sight
of the front camera) while the vehicle is traveling on the main road.

●

Roundabout exit road speed signs may be detected and displayed (if posi-
tioned in sight of the front camera) while traveling on a roundabout.

●

The front of the vehicle is raised or lowered due to the carried load

●

The surrounding brightness is not sufficient or changes suddenly.

●

When a sign intended for trucks, etc. is recognized.

●

The speed information displayed on the meter and on the navigation system
may be different due to the navigation system using map data.

■

Speed limit sign display

If the power switch was last turned off while a speed limit sign was displayed
on the main display or multi-information display, the same sign displays again
when the power switch is turned to ON mode.

■

If “RSA Malfunction Visit Your Dealer” is shown

The system may be malfunctioning. Have the vehicle inspected by your Toy-
ota dealer.

■

Customization

Some functions can be customized. (Customizable features: 



P. 753)

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Dynamic radar cruise control



with full-speed 

range

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. 418)

●

Constant speed control mode (



P. 425)

Vehicle-to-vehicle 

distance

switch
Indicators
Multi-information display
Set speed
Cruise control switch

Summary of functions

System Components

1

2
3
4
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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. 428

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

may not function correctly:



P. 429

●

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 setting to 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.

●

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  or  front
camera

●

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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This mode employs a radar 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 suitable fol-
lowing distance from the vehicle ahead. The desired vehicle-to-vehi-
cle  distance  can  also  be  set  by  operating  the  vehicle-to-vehicle
distance switch.

When  driving  on  downhill  slopes,  the  vehicle-to-vehicle  distance  may
become shorter.

Driving in vehicle-to-vehicle distance control mode

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Example of constant speed cruising
When there are no vehicles ahead

The vehicle travels at the speed set by the driver.

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 (start-off opera-
tion)  will  resume  follow-up  cruising.  If  the  start-off  operation  is  not  per-
formed, system control continues to keep your vehicle stopped.
When the turn signal lever is operated and your vehicle moves to an over-
taking  lane  while  driving  at  50  mph  (80  km/h)  or  more,  the  vehicle  will
accelerate to help to overtake a passing vehicle.
The  system’s  identification  of  what  is  an  overtaking  lane  may  be  deter-
mined solely based on the location of the steering wheel in the vehicle (left
side driver position versus right side driver position.) If the vehicle is driven
to a region where the overtaking lane is on a different side from where the
vehicle is normally driven, the vehicle may accelerate when the turn signal
lever is operated in the opposite direction to the overtaking lane (e.g., if the
driver normally operates the vehicle in a region where the overtaking lane
is to the right but then drives to a region where the overtaking lane is to the
left, the vehicle may accelerate when the right turn signal is activated).

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.

1

2

3

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Press  the  “ON-OFF”  button  to
activate the cruise control.

Dynamic  radar  cruise  control  indi-
cator will come on and a message
will be displayed on the multi-infor-
mation 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. 425)

Accelerate  or  decelerate,  with
accelerator  pedal  operation,  to
the desired vehicle speed (at or
above  approximately  20  mph
[30  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.

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

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5

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●

Adjusting the set speed by the lever

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. 425), 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

1

2

422

PRIUS PRIME_OM_OM47D71U_(U)

5-5. Using the driving support systems

●

Increasing the set speed by the accelerator pedal
Accelerate with accelerator pedal operation to the desired vehicle
speed.
Push the lever down.

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.

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)

1

2

Preceding 
vehicle mark

1
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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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.

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

1

2

424

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5-5. Using the driving support systems

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)

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5-5. Using the driving support systems

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Drivin

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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, 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  dynamic
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  20  mph
[30  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. 421

Canceling and resuming the speed setting: 



P. 423

Selecting constant speed control mode

1

2

426

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5-5. Using the driving support systems

■

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

●

The shift position is in D.

●

The desired set speed can be set when the vehicle speed is approximately
20 mph (30 km/h) or more.
(However,  when  the  vehicle  speed  is  set  while  driving  at  below  approxi-
mately 20 mph [30 km/h], the set speed will be set to approximately 20 mph
[30 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.

●

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.

●

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. 348



If vehicle-to-vehicle distance control mode is automatically canceled for any
reasons  other  than  the  above,  there  may  be  a  malfunction  in  the  system.
Contact your Toyota dealer.

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5

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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 20 mph (30 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.

If  constant  speed  control  mode  is  automatically  canceled  for  any  reasons
other than the above, there may be a malfunction in the system. Contact your
Toyota dealer.

■

Brake operation

A brake operation sound may be heard and the brake pedal response may
change, but these are not malfunctions.

■

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. (



P. 382, 684) 

428

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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. 424) 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

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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 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

430

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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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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. 515, 527), 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.

1

2

3

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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

1

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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. 246)

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 screen (RCTA function only)

If a vehicle approaching from the right or left at the rear of the vehicle is
detected, the RCTA detection screen will be shown on the multi-informa-
tion display.

The Blind Spot Monitor function and Rear Cross Traffic Alert function

can be enabled/disabled on the 

 screen (



P. 246) 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

2

3

4

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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. 436). 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.

■

Certifications for the Blind Spot Monitor



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

PRIUS PRIME_OM_OM47D71U_(U)

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5-5. Using the driving support systems

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

For vehicles sold in Canada

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WARNING

■

Handling the radar sensor

●

Keep the sensor and its surrounding area on the bumper clean at all times.

●

Do not subject a sensor or its surrounding area on the rear bumper to a
strong impact.
If a sensor is moved even slightly off position, the system may malfunction
and vehicles may not be detected correctly.
In  the  following  situations,  have  your  vehicle  inspected  by  your  Toyota
dealer.
• A sensor or its surrounding area is subject to a strong impact.
• If  the  surrounding  area  of  a  sensor  is  scratched  or  dented,  or  part  of

them has become disconnected.

●

Do not disassemble the sensor.

●

Do not attach accessories or stickers to the sensor or surrounding area on
the bumper.

●

Do not modify the sensor or surrounding area on the bumper.

●

Do not paint the rear bumper any color other than an official Toyota color.

One  Blind  Spot  Monitor  sensor  is
installed  inside  the  left  and  right  side  of
the  vehicle  rear  bumper  respectively.
Observe the following to ensure the Blind
Spot Monitor can function correctly.

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The Blind Spot Monitor function uses radar sensors to detect vehicles
that are traveling in an adjacent lane in the area that is not reflected in
the outside rear view mirror (the blind spot), and advises the driver of
the vehicle’s existence via the outside rear view mirror indicator.

The areas that vehicles can be detected in are outlined below.
The range of the detection area extends to:

Approximately  11.5  ft.  (3.5  m)
from the side of the vehicle

The  first  1.6  ft.  (0.5  m)  from  the
side  of  the  vehicle  is  not  in  the
detection area

Approximately 9.8 ft. (3 m) from
the rear bumper
Approximately 3.3 ft. (1 m) for-
ward of the rear bumper

The Blind Spot Monitor function

The Blind Spot Monitor function detection areas

IO55PH029

1

2

3

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■

The Blind Spot Monitor function is operational when

●

The BSM system is set to on (



P. 246)

●

Vehicle speed is greater than approximately 10 mph (16 km/h)

■

The Blind Spot Monitor function will detect a vehicle when

●

A vehicle in an adjacent lane overtakes your vehicle.

●

You overtake a vehicle in adjacent lane slowly.

●

Another vehicle enters the detection area when it changes lanes.

■

Conditions under which the Blind Spot Monitor function will not detect a
vehicle

The Blind Spot Monitor function is not designed to detect the following types
of vehicles and/or objects:

●

Small motorcycles, bicycles, pedestrians etc.

*

●

Vehicles traveling in the opposite direction

●

Guardrails, walls, signs, parked vehicles and similar stationary objects

*

●

Following vehicles that are in the same lane

*

●

Vehicles driving 2 lanes across from your vehicle

*

●

Vehicles which are being overtaken rapidly by your vehicle

*

*

: Depending on conditions, detection of a vehicle and/or object may occur.

WARNING

■

Cautions regarding the use of the system

The driver is solely responsible for safe driving. Always drive safely, taking
care to observe your surroundings.
The Blind Spot Monitor function is a supplementary function which alerts the
driver that a vehicle is present in the blind spot. Do not overly rely on the
Blind Spot Monitor function. The function cannot judge if it is safe to change
lanes, therefore over reliance could cause an accident resulting in death or
serious injury.
According  to  conditions,  the  system  may  not  function  correctly. Therefore
the driver’s own visual confirmation of safety is necessary.

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■

Conditions under which the Blind Spot Monitor function may not func-
tion correctly

●

The Blind Spot Monitor function may not detect vehicles correctly in the fol-
lowing situations:
• When the sensor is misaligned due to a strong impact to the sensor or its

surrounding area

• When mud, snow, ice, a sticker, etc. is covering the sensor or surround-

ing area on the rear bumper

• When driving on a road surface that is wet with standing water during bad

weather, such as heavy rain, snow, or fog

• When multiple vehicles are approaching with only a small gap between

each vehicle

• When the distance between your vehicle and a following vehicle is short
• When there is a significant difference in speed between your vehicle and

the vehicle that enters the detection area

• When the difference in speed between your vehicle and another vehicle

is changing

• When  a  vehicle  enters  a  detection  area  traveling  at  about  the  same

speed as your vehicle

• As your vehicle starts from a stop, a vehicle remains in the detection area
• When driving up and down consecutive steep inclines, such as hills, dips

in the road, etc.

• When driving on roads with sharp bends, consecutive curves, or uneven

surfaces

• When vehicle lanes are wide, or when driving on the edge of a lane, and

the vehicle in an adjacent lane is far away from your vehicle

• When a bicycle carrier or other accessory is installed to the rear of the

vehicle

• When there is a significant difference in height between your vehicle and

the vehicle that enters the detection area

• Immediately after the Blind Spot Monitor function is turned on

●

Instances of the Blind Spot Monitor function unnecessarily detecting a vehi-
cle and/or object may increase in the following situations:
• When the sensor is misaligned due to a strong impact to the sensor or its

surrounding area

• When the distance between your vehicle and a guardrail, wall, etc. that

enters the detection area is short

• When driving up and down consecutive steep inclines, such as hills, dips

in the road, etc.

• When vehicle lanes are narrow, or when driving on the edge of a lane,

and a vehicle traveling in a lane other than the adjacent lanes enters the
detection area

• When driving on roads with sharp bends, consecutive curves, or uneven

surfaces

• When the tires are slipping or spinning
• When the distance between your vehicle and a following vehicle is short
• When a bicycle carrier or other accessory is installed to the rear of the

vehicle

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The Rear Cross Traffic Alert functions when your vehicle is in reverse.
It can detect other vehicles approaching from the right or left rear of
the vehicle. It uses radar sensors to alert the driver of the other vehi-
cle’s existence through flashing the outside rear view mirror indicators
and sounding a buzzer.

The Rear Cross Traffic Alert function

IO55PH087

Approaching vehicles

Detection areas

WARNING

■

Cautions regarding the use of the system

The driver is solely responsible for safe driving. Always drive safely, taking
care to observe your surroundings.
The Rear Cross Traffic Alert function is only an assist and is not a replace-
ment for careful driving. The driver must be careful when backing up, even
when  using  the  Rear  Cross  Traffic Alert  function.  The  driver’s  own  visual
confirmation of behind you and your vehicle is necessary and be sure there
are no pedestrians, other vehicles etc. before backing up. Failure to do so
could cause death or serious injury.
According  to  conditions,  the  system  may  not  function  correctly. Therefore
the driver’s own visual confirmation of safety is necessary.

1

2

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The areas that vehicles can be detected in are outlined below.

To give the driver a more consistent time to react, the buzzer can alert
for faster vehicles from farther away.
Example:

■

The Rear Cross Traffic Alert function is operational when

●

The BSM system is set to on. (



P. 246)

●

The shift position is in R.

●

Vehicle speed is less than approximately 5 mph (8 km/h).

●

Approaching vehicle speed is between approximately 5 mph (8 km/h) and
18 mph (28 km/h).

The Rear Cross Traffic Alert function detection areas

IO55PH088

Approaching vehicle

Speed

Approximate 
alert distance

Fast

18 mph (28 km/h)

65 ft. (20 m)

Slow

5 mph (8 km/h)

18 ft. (5.5 m)

1

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■

Conditions  under  which  the  Rear  Cross  Traffic  Alert  function  will  not
detect a vehicle

The Rear Cross Traffic Alert function is not designed to detect the following
types of vehicles and/or objects:

●

Vehicles approaching from directly behind

●

Vehicles backing up in a parking space next to your vehicle

●

Guardrails, walls, signs, parked vehicles and similar stationary objects

*

●

Small motorcycles, bicycles, pedestrians, etc.

*

●

Vehicles moving away from your vehicle

●

Vehicles approaching from the parking spaces next to your vehicle

*

*

: Depending  on  the  conditions,  detection  of  a  vehicle  and/or  object  may

occur.

■

Conditions  under  which  the  Rear  Cross  Traffic Alert  function  may  not
function correctly

●

The Rear Cross Traffic Alert function may not detect vehicles correctly in the
following situations:
• When the sensor is misaligned due to a strong impact to the sensor or its

surrounding area

• When mud, snow, ice, a sticker, etc. is covering the sensor or surround-

ing area on the rear bumper

• When driving on a road surface that is wet with standing water during bad

weather, such as heavy rain, snow, or fog

• When multiple vehicles are approaching with only a small gap between

each vehicle

• When a vehicle is approaching at high speed

●

Vehicles that the sensors cannot detect
due to obstructions

IO55PH089

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• Immediately after the Blind Spot Monitor function is turned on
• Immediately after the hybrid system is started with the Blind Spot Monitor

function on

• When  backing  up  on  a  slope  with  a

sharp change in grade

• When backing out of a shallow angle

parking spot

• When  the  sensors  cannot  detect  a

vehicle due to obstructions

IO55PH089

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●

Instances of the Rear Cross Traffic Alert function unnecessarily detecting a
vehicle and/or object may increase in the following situations:
• When a vehicle passes by the side of your vehicle

• When  the  distance  between  your  vehicle  and  metal  objects,  such  as  a

guardrail, wall, sign, or parked vehicle, which may reflect electrical waves
toward the rear of the vehicle, is short

• When  the  parking  space  faces  a

street  and  vehicles  are  being  driven
on the street

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Intuitive parking assist



Front corner sensors
Front center sensors
Rear corner sensors
Rear center sensors
Front side sensors
Rear side sensors

The intuitive parking assist can be

enabled/disabled  on  the 

screen  (



P.  246)  of  the  multi-

information display.

When on is selected, intuitive park-
ing assist indicator will come on.

Once off is selected, the intuitive parking assist will not return to on until it

is turned to on by the 

 screen of multi-information display again. (The

system does not automatically return to on even when the hybrid system is
restarted.)



: If equipped

The distance from your vehicle to nearby obstacles when paral-
lel  parking  or  maneuvering  into  a  garage  is  measured  by  the
sensors  and  communicated  via  the  displays  and  a  buzzer.
Always check the surrounding area when using this system.

Types of sensors

1
2
3
4
5
6

Turning the intuitive parking assist on/off

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When  the  sensors  detect  an  obstacle,  the  following  displays  inform
the driver of the position and distance to the obstacle.

■

Multi-information display

Front  center  sensor  opera-
tion
Front  corner  sensor  opera-
tion
Front side sensor operation
Rear side sensor operation
Rear corner sensor operation
Rear center sensor operation

• The operation display is gray when the sensors are operating.
• The front side sensor operation displays and rear side sensor opera-

tion  displays  are  not  shown  until  a  scan  of  the  side  areas  is  com-
pleted.

Display

1

2

3
4
5
6

PRIUS PRIME_OM_OM47D71U_(U)

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■

Distance display

Sensors that detect an obstacle will illuminate continuously or blink.

*

: The images may differ from those shown in the illustrations depending on

the detection status. (



P. 446)

Sensor detection display, obstacle distance

Display

*

Approximate distance to obstacle

Front corner, front 

center and front side 

sensors

Rear corner, rear 

center and rear side 

sensors

(continuous)

3.3 ft. (100 cm) to 
2.0 ft (60 cm)

4.9 ft. (150 cm) to 
2.0 ft. (60 cm)

(continuous)

2.0 ft. (60 cm) to 
1.5 ft (45 cm)
2.0 ft. (60 cm) to 
1.5 ft. (45 cm)
3.3 ft. (100 cm) to 
2.3 ft. (70 cm)

3.3 ft. (100 cm) to 
2.3 ft. (70 cm)
2.0 ft. (60 cm) to 
1.5 ft (45 cm)
2.0 ft. (60 cm) to 
1.5 ft. (45 cm)

(continuous)

1.5 ft. (45 cm) to 
1.2 ft. (35 cm)
1.5 ft. (45 cm) to 
1.2 ft. (35 cm)
2.3 ft. (70 cm) to 
1.0 ft. (30 cm)

2.3 ft. (70 cm) to 
1.0 ft. (30 cm)
1.5 ft. (45 cm) to 
1.2 ft. (35 cm)
1.5 ft. (45 cm) to 
1.2 ft. (35 cm)

(blinking)

Less than 
1.2 ft. (35 cm)
Less than 
1.2 ft. (35 cm)
Less than 
1.0 ft. (30 cm)

Less than 
1.0 ft. (30 cm)
Less than 
1.2 ft. (35 cm)
Less than 
1.2 ft. (35 cm)

Far

Near

1

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

Front center sensors
Front corner sensors
Front side sensors

Rear side sensors
Rear corner sensors
Rear center sensors

1
2
3

4
5
6

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When an obstacle is detected, the buzzer sounds.

●

As  the  obstacle  is  approached,  the  buzzer  sounds  more  rapidly.
When  the  obstacle  is  extremely  close,  the  buzzer  switches  from
sounding intermittently (short beeps) to continuously (a long beep).

• Distance to obstacle detected by front corner sensor is approxi-

mately 1.2 ft. (35 cm) or less

• Distance  to  obstacle  detected  by  front  side  sensor  or  rear  side

sensor is approximately 1.0 ft. (30 cm) or less

• Distance  to  obstacle  detected  by  front  sensor  is  approximately

1.2 ft. (35 cm) or less

• Distance to obstacle detected by rear corner sensor is approxi-

mately 1.2 ft. (35 cm) or less

• Distance  to  obstacle  detected  by  back  sensor  is  approximately

1.2 ft. (35 cm) or less

●

When an obstacle is detected by multiple sensors simultaneously,
the buzzer sounds according to the distance to the closest obsta-
cle.

●

When obstacles are simultaneously detected to the front and rear
of  the  vehicle,  separate  buzzers  sound  patterns  according  to  the
distance to each obstacle.

The volume and timing of the buzzer can be changed. (



P. 753)

Buzzer

PRIUS PRIME_OM_OM47D71U_(U)

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5-5. Using the driving support systems

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Approximately 3.3 ft. (100 cm)
Approximately 4.9 ft. (150 cm)
Approximately 2.0 ft. (60 cm)
Approximately 3.3 ft. (100 cm)

• The detection range is shown in

the illustration to the right. How-
ever,  the  sensor  will  not  detect
the obstacle if it is too close.

• For  details  regarding  obstacle

detection in the side areas. 
(



P. 450)

• The distance at which an obsta-

cle can be detected and whether
it  can  be  detected  depends  on
the  shape  and  condition  of  the
obstacle.

The obstacle detection range can be changed. (



P. 753)

■

Operation conditions

The power switch is turned on.

●

Front corner sensors:
• Shift position is not in P
• Vehicle speed is approximately 6 mph (10 km/h) or less

●

Front side sensors/rear side sensors:
• Shift position is not in P
• Vehicle speed is approximately 6 mph (10 km/h) or less
• Steering wheel is turned approximately 90



 or more

●

Front center sensors:
• Shift position is not in P or R
• Vehicle speed is approximately 6 mph (10 km/h) or less

●

Rear corner sensors/rear center sensors:
Shift position is in R

■

Intuitive parking assist pop-up display



P. 471

Detection range of the sensors

1
2
3
4

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■

Sensor detection information

●

The sensor’s detection areas are limited to the areas around the vehicle’s
bumper.

●

Depending on the shape of the obstacle and other factors, the detection dis-
tance may shorten, or detection may be impossible.

●

Obstacles may not be detected if they are too close to the sensor.

●

There  will  be  a  short  delay  between  obstacle  detection  and  display.  Even
when traveling at a low speed, if you come too close to an obstacle before
the display and buzzer activate, the display and buzzer may not activate at
all.

●

Thin  posts  or  objects  lower  than  the  sensor  may  not  be  detected  when
approached, even if they have been detected once.

●

It might be difficult to hear beeps due to the volume of audio system or air
flow noise of the air conditioning system.

■

Obstacle warning function

When  an  obstacle  in  the  side  areas  is  within  the  vehicle  course  while  the
vehicle is moving forward or backward, this function inform the driver by the
display and the buzzer. (



P. 447, 448)

■

Obstacle detection in side areas

●

Obstacles in the side areas are detected while driving by scanning the side
areas with the side sensors. Recognized obstacles are retained in memory
for up to approximately 2 minutes.

●

Obstacles may not be detected in the side areas until the scan completes.
After  the  power  switch  is  turned  on,  scanning  completes  after  driving  the
vehicle for a short period of time.

●

When an obstacle such as another vehicle, pedestrian or animal is detected
by the side sensors, the obstacle may continue to be detected even after it
has left the side sensor detection area.

Obstacle
Calculated vehicle course

1

2

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■

If  “Clean  Parking Assist  Sensor”  is  displayed  on  the  multi-information
display

A  sensor  may  be  dirty  or  covered  with  snow  or  ice.  In  such  cases,  if  it  is
removed from the sensor, the system should return to normal.
Also, due to the sensor being frozen at low temperatures, a malfunction dis-
play may appear or an obstacle may not be detected. If the sensor thaws out,
the system should return to normal.

■

If “Parking Assist Malfunction” is displayed on the multi-information dis-
play

Depending on the malfunction of the sensor, the device may not be working
normally. Have the vehicle inspected by your Toyota dealer.

■

Certification (Canada only)

This ISM device complies with Canadian ICES-001.

■

Customization

Settings (e.g. buzzer volume) can be changed.
(Customizable features: 



P. 753)

WARNING

■

When using intuitive parking assist

Observe the following precautions to avoid an unexpected accident.

●

Do not exceed the speed limit of 6 mph (10 km/h).

●

The sensors’ detection areas and reaction times are limited. When moving
forward or reversing, check the areas surrounding the vehicle (especially
the  sides  of  the  vehicle)  for  safety,  and  drive  slowly,  using  the  brake  to
control the vehicle’s speed.

●

Do not install accessories within the sensors’ detection areas.

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WARNING

■

Sensors

Certain vehicle conditions and the surrounding environment may affect the
ability of the sensor to correctly detect obstacles. Particular instances where
this may occur are listed below.

●

There is dirt, snow or ice on the sensor. (Wiping the sensors will resolve
this problem.)

●

The sensor is frozen. (Thawing the area will resolve this problem.) 
In especially cold weather, if a sensor is frozen, the screen may show an
abnormal display, or obstacles may not be detected.

●

The sensor is covered in any way.

●

In harsh sunlight or intense cold weather

●

On an extremely bumpy road, on an incline, on gravel, or on grass

●

The  vicinity  of  the  vehicle  is  noisy  due  to  vehicle  horns,  motorcycle
engines, air brakes of large vehicles, or other loud noises producing ultra-
sonic waves.

●

The sensor is splashed with water or drenched with heavy rain.

●

The sensor is drenched with water on a flooded road.

●

The vehicle is leaning considerably to one side.

●

The vehicle is equipped with a fender pole or wireless antenna.

●

The vehicle is approaching a tall or curved curb.

●

The area directly under the bumpers is not detected.

●

If obstacles draw too close to the sensor.

●

The bumper or sensor receives a strong impact.

●

A non-genuine Toyota suspension (lowered suspension etc.) is installed.

●

There is another vehicle equipped with parking assist sensors in the vicin-
ity.

●

Towing eyelets are installed.

●

A backlit license plate is installed.

In addition to the examples above, depending on the shape and condition of
obstacles,  detection  may  not  be  possible,  or  the  detection  range  may  be
shortened.

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WARNING

■

Side sensors

In the following situations, the intuitive parking assist may not operate nor-
mally and may result in an unexpected accident. Drive carefully.

●

Obstacles may not be detected in the side areas until the vehicle is driven
for a short time and a scan of the side areas is completed. (



P. 450)

●

Even  after  the  scan  of  the  side  areas  is  completed,  obstacles  such  as
other vehicles, people or animals that approach from the sides cannot be
detected.

●

Even after the scan of the side areas is completed, obstacles may not be
detected depending on the surrounding situation of the vehicle.
At that time, the side sensor operation displays (



P. 446) temporary turn

off.

■

Obstacles which may not be properly detected

The  shape  of  the  obstacle  may  prevent  the  sensor  from  detecting  it.  Pay
particular attention to the following obstacles:

●

Wires, fences, ropes, etc.

●

Cotton, snow and other materials that absorb sound waves

●

Sharply-angled objects

●

Low obstacles

●

Tall obstacles with upper sections projecting outwards in the direction of
your vehicle

●

People may not be detected if they are wearing certain types of clothing.

●

Moving objects such as people or animals

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NOTICE

■

When using intuitive parking assist

In the following situations, the system may not function correctly due to a
sensor malfunction etc. Have the vehicle checked by your Toyota dealer.

●

Intuitive parking assist operation display flashes, and a beep sounds when
no obstacles are detected.

●

If  the  area  around  a  sensor  collides  with  something,  or  is  subjected  to
strong impact.

●

If the bumper collides with something.

●

If the display shows up and remains on without a beep.

●

If a display error occurs, first check the sensor.
If the error occurs even when there is no ice, snow or mud on the sensor, it
is likely that the sensor is malfunctioning.

■

Notes when washing the vehicle

●

Do not apply intensive bursts of water or steam to the sensor area.
Doing so may result in the sensor malfunctioning.

●

When using steam to wash the vehicle, do not direct steam too close to
the sensors. The sensors may not function properly if subjected to steam.

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Parking Support Brake function



The system operates in the following situations when an obstacle is
detected in the traveling direction of the vehicle.

◆

The vehicle is driven at low speeds and the brake pedal is not
depressed, or is depressed too late

◆

The accelerator pedal is depressed too far



: If equipped

When  a  collision  may  occur  with  an  obstacle  while  parking  or
traveling at low speeds, when the vehicle suddenly moves for-
ward due to mistaken accelerator pedal operation, or when the
vehicle  moves  due  to  the  wrong  shift  position  being  selected,
the sensors detect obstacles to the front or rear in the traveling
direction  of  the  vehicle,  and  the  system  operates  to  lessen
impact with obstacles such as walls, and reduce resulting dam-
age.

Examples of system operation

456

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5-5. Using the driving support systems

◆

The  vehicle  moves  due  to  the  wrong  shift  position  being
selected

Front corner sensors
Front center sensors
Rear corner sensors
Rear center sensors

The Parking Support Brake function can be enabled/disabled on the

 screen (



P. 246) of the multi-information display.

When  the  Parking  Support  Brake
function is off, the PKSB OFF indi-
cator illuminates.

When the Parking Support Brake function is switched off, system operation

does not resume until the function is switched back on through the 
screen  on  the  multi-information  display.  (System  operation  does  not
resume by operating the power switch.)

Types of sensors

1
2
3
4

Changing settings of the Parking Support Brake function

PRIUS PRIME_OM_OM47D71U_(U)

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5-5. Using the driving support systems

5

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When the Parking Support Brake function detects an obstacle with a
probability of collision, hybrid system output is restricted to restrain an
increase in vehicle speed. (Hybrid system output restriction control: A)
Furthermore, when the accelerator pedal continues to be depressed,
the brakes are applied to reduce the vehicle speed. (Brake control: B)

Operation

DOWN

DOWN

UP

ON

OFF

ON

OFF

ON

OFF

458

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Accelerator pedal
Brake pedal
Hybrid system output
Braking force

Control starts
Collision is possible
Collision is likely

1
2
3
4

5
6
7

PRIUS PRIME_OM_OM47D71U_(U)

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5

Drivin

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■

Operation starting conditions

When  the  PKSB  OFF  indicator  is  not  illuminated  or  flashing
(



P. 464, 676) and all of the following conditions are met, the

system operates.



Hybrid system output restriction control

●

The Parking Support Brake function is on.

●

The vehicle speed is 10 mph (15 km/h) or less.

●

There is an obstacle in the traveling direction of the vehicle (6 to
13 ft. [2 to 4 m ahead]).

●

The system determined that a stronger-than-normal brake opera-
tion was necessary to avoid a collision.



Brake control

●

Hybrid system output restriction control is being performed.

●

The system determined that an emergency brake operation was
necessary to avoid a collision.

■

Operation ending conditions

In any of the following situations, the system stops operating.



Hybrid system output restriction control

●

The  Parking  Support  Brake  function  has  been  turned  off
(stopped).

●

The collision became avoidable with normal brake operation.

●

The obstacle is no longer in the traveling direction of the vehicle
(6 to 13 ft. [2 to 4 m ahead]).



Brake control

●

The  Parking  Support  Brake  function  has  been  turned  off
(stopped).

●

Approximately 2 seconds elapsed after the vehicle was stopped
by brake control.

●

The brake pedal was depressed after the vehicle was stopped by
brake control.

●

The obstacle is no longer in the traveling direction of the vehicle
(6 to 13 ft. [2 to 4 m ahead]).

Operation conditions

460

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When  the  hybrid  system  output  restriction  control  or  brake  control
operates, the buzzer sounds and a message is displayed on the multi-
information display to alert the driver.

Depending  on  the  situation,  output  restriction  control  operates  to  either
limit acceleration or restrict output as much as possible.

Display and buzzer for hybrid system output restriction control
and brake control

Control

Situation

Multi-information 

display

PKSB 

OFF Indi-

cator

Buzzer

Hybrid  sys-
tem 

output

restriction
control 

is

operating
(accelera-
tion 

limita-

tion control)

Acceleration
at  a  certain
speed 

or

higher  is  not
possible.

Not illumi-

nated

Short 

beep

Hybrid  sys-
tem 

output

restriction
control 

is

operating
(control 

to

restrict  out-
put  as  much
as possible)

A  stronger-
than-normal
brake  opera-
tion is neces-
sary

Not illumi-

nated

Brake 

con-

trol is operat-
ing

Emergency
braking 

is

necessary

The  vehicle
is stopped by
system  oper-
ation

The  vehicle
is 

stopped

after 

brake

control  oper-
ation

Illumi-

nated

PRIUS PRIME_OM_OM47D71U_(U)

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■

Sensor detection range

The  detection  range  of  the  Parking  Support  Brake  function  differs  from  the
detection range of the intuitive parking assist. (



P. 449)

Therefore,  even  if  the  intuitive  parking  assist  detects  an  obstacle  and  pro-
vides a warning, the Parking Support Brake function may not start operating.

■

System operation

When the vehicle is stopped by system operation, the Parking Support Brake
function stops and the PKSB OFF indicator illuminates.

■

System recovery

When  the  Parking  Support  Brake  function  is  stopped  by  system  operation
and  you  would  like  to  resume  operation,  either  turn  the  Parking  Support
Brake function on again (



P. 456), or turn the power switch off and then back

on. Furthermore, when the vehicle moves with an obstacle no longer in the
traveling direction of the vehicle, or when the traveling direction of the vehicle
changes  (such  as  when  switching  from  moving  forward  to  backing  up,  and
vice versa), system operation automatically resumes.

■

Obstacles not detected by the sensors

The following obstacles may not be detected by the sensors.

●

Objects such as people, cloth and snow, that are difficult for sonic waves to
reflect off of. (In particular, people may also not be detected depending on
the type of clothing they are wearing.)

●

Objects not perpendicular with the ground, objects not at a right angle to the
traveling direction of the vehicle, uneven objects or waving objects

●

Low objects

●

Thin objects such as wires, fences, ropes and signposts

●

Objects that are extremely close to the bumper

■

Intuitive parking assist buzzer

Regardless of whether the intuitive parking assist is on or off (



P. 445), if the

Parking Support Brake function is not stopped (



P. 456), when the front or

rear sensors detect an obstacle and brake control is performed, the intuitive
parking assist buzzer also sounds and a notification of the approximate dis-
tance to the obstacle is provided.

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■

Situations when the system may operate even though there is no possi-
bility of a collision

In the following situations, the system may operate even though there is no
possibility of a collision.

●

Environmental influence

• The vehicle is driven toward a banner or flag, a low-hanging branch or a

boom  barrier  (such  as  those  used  at  railroad  crossings,  toll  gates  and
parking lots).

• There  is  an  obstacle  on  the  shoulder  of  the  road  (when  the  vehicle  is

driven in a narrow tunnel, on a narrow bridge or on a narrow road)

• The vehicle is being parallel parked
• There is a rut or hole in the surface of the road
• When the vehicle is driven on a metal cover (grating), such as those used

for drainage ditches

• The vehicle is driven on a steep slope
• The sensor is covered by water on a flooded road

●

Influence from the weather
• Ice, snow, dirt, etc., has adhered to the sensor (if removed, the system

returns to normal)

• Heavy rain or water strikes the vehicle
• In severe weather such as fog, snow or a sand storm

●

Influence from other sonic waves
• An ultrasonic wave source is nearby, such as the horn or parking assist

sensors of another vehicle, a vehicle detector, a motorcycle engine or the
air brake of a large vehicle

• Electronic  components  (such  as  a  backlit  license  plate  (especially  fluo-

rescent  types),  fog  lights,  a  fender  pole  or  a  wireless  antenna)  are
installed near the sensors

• The  vehicle  is  driven  on  a  narrow

road

• The vehicle is driven on a gravel road

or in an area with tall grass

PRIUS PRIME_OM_OM47D71U_(U)

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●

Changes in the vehicle
• The vehicle is tilted a large amount
• The height of the vehicle has drastically changed due to the carried load

(the nose tilts up or down)

• The direction of the sensor has deviated due to a collision or other impact

■

In the unlikely event that the Parking Support Brake function mistakenly
operates at a crossing or elsewhere

Even in the unlikely event that the Parking Support Brake function mistakenly
operates at a crossing or elsewhere, brake control is canceled after approxi-
mately 2 seconds, allowing you to proceed forward and leave the area. Fur-
thermore, brake control is also canceled when the brake pedal is depressed.
Depressing  the  accelerator  pedal  again  allows  you  to  proceed  forward  and
leave the area.

■

Situations in which the system may not operate normally

In the following situations, the system may not operate normally.

●

Environmental influence
• There  is  an  obstacle  that  cannot  be  detected  between  the  vehicle  and

another obstacle that can be detected

• An obstacle such as another vehicle, a motorcycle, a bicycle or a pedes-

trian cuts in front of the vehicle or jumps out from the side.

●

Influence from the weather

• Ice, snow, dirt, etc., has adhered to the sensor (if removed, the system

returns to normal)

• Heavy rain or water strikes the vehicle
• In severe weather such as fog, snow or a sand storm

• The  area  around  the  sensor  is

extremely hot or cold 

• The wind is strong

464

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5-5. Using the driving support systems

●

Influence from other sonic waves
• An ultrasonic wave source is nearby, such as the horn or parking assist

sensors of another vehicle, a vehicle detector, a motorcycle engine or the
air brake of a large vehicle

• Electronic  components  (such  as  a  backlit  license  plate  (especially  fluo-

rescent  types),  fog  lights,  a  fender  pole  or  a  wireless  antenna)  are
installed near the sensors

●

Changes in the vehicle
• When driving with the shift position in N
• The vehicle is tilted a large amount
• The height of the vehicle has drastically changed due to the carried load

(the nose tilts up or down)

• The direction of the sensor has deviated due to a collision or other impact

■

Parking  Support  Brake  function  while  the  Simple  Advanced  Parking
Guidance System is operating



P. 469

■

When removing and installing the 12-volt battery

The system needs to be initialized.
The system can be initialized by driving the vehicle straight ahead for 5 sec-
onds or more at a speed of approximately 22 mph (35 km/h) or higher.

■

When “PKSB Unavailable” is displayed on the multi-information display
and the PKSB OFF indicator flashes

●

Ice, snow, dirt, etc., may have adhered to the sensor. If this occurs, remove
the ice, snow, dirt, etc., from the sensor to return the system to normal.
Also, a warning message may be displayed at low temperatures due to ice
forming on the sensor, and the sensor may not detect obstacles. Once the
ice melts, the system will return to normal.

●

If this message is shown even after removing dirt from the sensor, or shown
when the sensor was not dirty to begin with, have the vehicle inspected at
your Toyota dealer.

●

System initialization may not have been performed after removal and instal-
lation of the 12-volt battery. Perform system initialization. 

■

When  “PKSB  Malfunction  Visit Your  Dealer”  is  displayed  on  the  multi-
information  display,  the  PKSB  OFF  indicator  flashes  and  the  buzzer
sounds

The  system  may  not  be  operating  properly.  Have  the  vehicle  inspected  at
your Toyota dealer.

PRIUS PRIME_OM_OM47D71U_(U)

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WARNING

■

For safe use

Do  not  rely  solely  upon  the  system.  Relying  solely  upon  the  system  may
lead to an unexpected accident.

●

Driving safely is the sole responsibility of the driver. Pay careful attention
to the surrounding conditions in order to ensure safe driving. The Parking
Support Brake function can provide support to lessen the severity of colli-
sions. However, it may not operate depending on the situation.

●

The  Parking  Support  Brake  function  is  not  a  system  designed  to  com-
pletely stop the vehicle. Furthermore, even if the Parking Support Brake
function is able to stop the vehicle, brake control is canceled after approxi-
mately 2 seconds, so depress the brake pedal immediately.

■

In order for the system to operate properly

Make  sure  to  observe  the  following  precautions  regarding  the  sensors
(



P.  456).  Failure  to  observe  these  precautions  may  cause  the  sensors

not to operate properly, and may result in an unexpected accident.

●

Do not perform work such as modification, disassembly or painting

●

Only perform replacements using genuine parts

●

Do not subject the area around the sensors to any impacts

●

Do not damage the sensors, and always keep them clean

■

Handling the suspension

Do  not  modify  the  suspension,  as  changes  to  the  height  or  incline  of  the
vehicle  may  prevent  the  sensors  from  correctly  detecting  obstacles,  may
cause the system not operate, or may cause the system to operate unnec-
essarily.

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NOTICE

■

Preventing sensor malfunctions

●

If the area around a sensor is subjected to an impact, equipment may not
operate properly due to a sensor malfunction. Have the vehicle inspected
at your Toyota dealer.

●

When  using  a  high-pressure  washer  to  wash  the  vehicle,  do  not  spray
water  directly  on  the  sensors.  The  sensors  may  not  function  properly  if
subjected to an impact from strong water pressure.

●

When using steam to wash the vehicle, do not direct steam too close to
the sensors. The sensors may not function properly if subjected to steam.

■

Preventing unnecessary operation

In the following situations, turn the Parking Support Brake function off. The
system may operate even though there is no possibility of a collision.

●

A chassis roller, chassis dynamo, free roller or similar equipment is being
used for an inspection, etc.

●

The vehicle is being loaded onto a ship, truck or other transport vessel

●

The suspension has been lowered or tires that have a different size than
the genuine tires are equipped

●

The height of the vehicle has drastically changed due to the carried load
(the nose tilts up or down).

●

A towing eyelet is installed

●

When using an automatic car wash

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S-APGS (Simple Advanced Parking Guidance 

System)



■

Function summary

The  Simple  Advanced  Parking  Guidance  System  automatically
operates the steering wheel to provide support when backing into
an area near a target parking spot, and when departing from a par-
allel  parking  spot.  (Changing  the  shift  position  and  speed  adjust-
ment  when  moving  forward  or  backing  up  are  not  performed
automatically.)

●

The Simple Advanced Parking Guidance System does not park
the  vehicle  automatically.  It  is  a  system  that  provides  support
when pulling out of a perpendicular or parallel parking spot.

●

The Simple Advanced Parking Guidance System provides steer-
ing  wheel  operation  assistance  to  guide  the  vehicle  toward  the
selected  intended  parking  spot.  The  selected  intended  parking
spot may not always be reachable, depending on road and vehi-
cle  conditions  at  the  time  of  parking,  and  the  distance  to  the
intended parking spot.

■

Linking with the Parking Support Brake function

While the Simple Advanced Parking Guidance System is operating,
if the system detects an obstacle that could result in a collision, the
emergency brakes operate, regardless of whether the Parking Sup-
port Brake function is on or off. (



P. 469)



: If equipped

Simple Advanced Parking Guidance System

WARNING

●

When  backing  up  or  proceeding  forward,  be  sure  to  directly  confirm  the
safety of the area to the front or rear, and the area around the vehicle, and
slowly  back  up  or  proceed  forward  while  adjusting  the  vehicle  speed  by
depressing the brake pedal.

●

If it seems the vehicle may make contact with a pedestrian, another vehi-
cle or any other obstacles, stop the vehicle by depressing the brake pedal,
and then press the S-APGS switch (



P. 470) to turn the system off.

468

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Chart  of  Simple  Advanced  Parking  Guidance  System  assist
modes and functions

Assist mode

Type of 
parking

Function summary

See page

Parallel parking 

assist mode

Parallel park-

ing

Guidance  is  provided  to
detect 

the 

intended

parking spot and reach a
position  to  begin  back-
ing  up  from. Assistance
is  provided  from  when
the vehicle begins back-
ing  up  until  it  reaches
the  intended  parking
spot.

P. 473

Exit parallel parking 

assist mode

Exit parallel 

parking

Assistance  starts  after
the  vehicle  has  been
parallel  parked.  Assis-
tance  is  provided  to
guide  the  vehicle  from
the  parking  space  to  a
position  from  which  it
can take off.

P. 480

Back-in parking 

assist mode

(with forward guid-

ance function)

Back-in park-

ing

Assistance  starts  after
stopping  the  vehicle  in
front  of  the  intended
parking spot, and is pro-
vided  for  backing  into  a
parking space, including
guidance  to  reach  a
position  to  begin  back-
ing up from.

P. 485

PRIUS PRIME_OM_OM47D71U_(U)

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■

Parking  Support  Brake  function  while  the  Simple  Advanced  Parking
Guidance System is operating

While the Simple Advanced Parking Guidance System is operating, if the sys-
tem detects an obstacle that could result in a collision, hybrid system output
restriction control and brake control of the Parking Support Brake function are
operated, regardless of whether the Parking Support Brake function is on or
off. (



P. 456)

●

After the Parking Support Brake function operates, operation of the Simple
Advanced Parking Guidance System is temporarily stopped, and operation
of the Parking Support Brake function is indicated on the multi-information
display. (



P. 460)

●

When  operation  of  the  Simple  Advanced  Parking  Guidance  System  is
stopped  3  times  by  operation  of  the  Parking  Support  Brake  function,  the
Simple Advanced Parking Guidance System is canceled.

●

Once  the  Simple Advanced  Parking  Guidance  System  becomes  available
after the Parking Support Brake function is operated, a message prompting
you  to  shift  is  displayed  on  the  multi-information  display.  Operation  of  the
Simple Advanced  Parking  Guidance  System  can  be  resumed  by  shifting
according  to  the  prompt  on  the  multi-information  display  and  pressing  the
S-APGS switch (



P. 470) again.

■

Shifting while the Simple Advanced Parking Guidance System is operat-
ing

If the system determines that the driver intends to move forward or in reverse,
assistance continues even if the driver shifted before being prompted to do so
by the system. However, because driver operation differs from the guidance
provided by the system, the number of turning maneuvers may increase.

■

Customization

Settings (e.g. obstacle detection range) can be changed. (Customizable fea-
tures: 



P. 753)