
3665-5. Using the driving support systems
■Objects which the system may 
not properly detect
The shape of the object may pre-
vent the sensor from detecting it. 
Pay particular attention to the fol-
lowing objects:
●Wires, fences, ropes, etc.
●Cotton, snow and other materials 
that absorb sound waves
●Sharply-angled objects
●Low objects
●Tall objects with upper sections 
projecting outwards in the direc-
tion of your vehicle
People may not be detected if they 
are wearing certain types of cloth-
ing.
■Situations in which the system 
may not operate properly
Certain vehicle conditions and the 
surrounding environment may affect 
the ability of a sensor to correctly 
detect objects. Particular instances 
where this may occur are listed 
below.
●There is dirt, snow, water drops or 
ice on a sensor. (Cleaning the 
sensors will resolve this problem.)
●A sensor is frozen. (Thawing the 
area will resolve this problem.) 
In especially cold weather, if a 
sensor is frozen the sensor dis-
play may be displayed abnor-
mally, or objects,  such as a wall, 
may not be detected.
●When a sensor or the area around 
a sensor is extremely hot or cold.
●On an extremely bumpy road, on 
an incline, on gravel, or on grass.
●When vehicle horns, vehicle 
detectors, motorcycle engines, air 
brakes of large vehicles, the clear-
ance sonar of other vehicles or 
other devices which produce ultra-
sonic waves are near the vehicle.
●A sensor is coated with a sheet of 
spray or heavy rain.
●If objects draw too close to the 
sensor.
●When a pedestrian is wearing 
clothing that does not reflect ultra-
sonic waves (ex. skirts with gath-
ers or frills).
●When objects that are not perpen-
dicular to the ground, not perpen-
dicular to the vehicle traveling 
direction, uneven, or waving are in 
the detection range.
●When strong winds are blowing.
●When driving in inclement weather 
such as fog, snow or a sandstorm.
●When an object that cannot be 
detected is between the vehicle 
and a detected object.
●If an object such as a vehicle, 
motorcycle, bicycle or pedestrian 
cuts in front of the vehicle or runs 
out from the side of the vehicle.
●If the orientation of a sensor has 
been changed due to a collision or 
other impact.
●When equipment such as a towing 
eyelet, transport hook, bumper 
protector, bumper trim, bicycle 
carrier or snow-removal device 
(snow plow) is installed near the 
sensor.
●If the front of the vehicle is raised 
or lowered due to the carried load.
●If the vehicle cannot be driven in a 
stable manner, such as when the 
vehicle has been in an accident or 
is malfunctioning.
●When tire chains, a compact 
spare tire or an emergency tire 
puncture repair kit are used. 

3675-5. Using the driving support systems
5
Driving
■Situations in which the system 
may operate even if there is no 
possibility of a collision
In some situations, such as the fol-
lowing, the system may operate 
even though there is  no possibility of 
a collision.
●When driving on a narrow road.
●When driving toward a banner, 
flag, low-hanging branch or boom 
barrier (such as those used at rail-
road crossings, toll gates and 
parking lots).
●When there is a rut or hole in the 
surface of the road.
●When driving on a metal cover 
(grating), such as those used for 
drainage ditches.
●When driving up or down a steep 
slope.
●If a sensor is hit by a large amount 
of water, such as when driving on 
a flooded road.
●There is dirt, snow, water drops or 
ice on a sensor. (Cleaning the 
sensors will resolve this problem.)
●A sensor is coated with a sheet of 
spray or heavy rain.
●When driving in  inclement weather 
such as fog, snow or a sandstorm.
●When strong winds are blowing.
●When vehicle horns, vehicle 
detectors, motorcycle engines, air 
brakes of large vehicles, the clear-
ance sonar of other vehicles or 
other devices which produce ultra-
sonic waves are near the vehicle.
●If the front of the vehicle is raised 
or lowered due to the carried load.
●If the orientation of a sensor has 
been changed due to a collision or 
other impact.
●The vehicle is approaching a tall 
or curved curb.
●Driving close to columns (H-
shaped steel beams, etc.) in multi-
story parking garages, construc-
tion sites, etc.
●If the vehicle cannot be driven in a 
stable manner, such as when the 
vehicle has been in an accident or 
is malfunctioning.
●On an extremely bumpy road, on 
an incline, on gravel, or on grass.
●When tire chains, a compact 
spare tire or an emergency tire 
puncture repair kit are used. 

3815-5. Using the driving support systems
5
Driving
ward or squatting
• Pedestrians who are lying down
• Pedestrians who are running
• Pedestrians who suddenly appear  from the shadow of the vehicle or 
a building
• Pedestrians who are riding mov- ing objects such as a bicycle or 
skateboard
• Pedestrians wearing oversized  clothing such as a rain coat, long 
skirt, etc., making their silhouette 
obscure
• Pedestrians whose body is par- tially hidden by an object, such as 
a cart or umbrella
• Pedestrians which are obscured  by darkness, such as at night
●In some situations, such as the 
following, pedestrians may not be 
detected by the rear camera 
detection function, preventing the 
function from operating properly:
• When backing up in inclement  weather (rain, snow, fog, etc.)
• When the rear camera is 
obscured (dirt, snow, ice, etc. are 
attached) or scratched
• When a very bright light, such as 
the sun, or the headlights of 
another vehicle, shines directly 
into the rear camera
• When backing up in a place where  the surrounding brightness 
changes suddenly, such as at the 
entrance or exit of a garage or 
underground parking lot
• When backing up in a dim envi-
ronment such as during dusk or in 
an underground parking lot
• When the camera position and 
direction are deviated
• When a towing hook is attached
• When towing with the vehicle
• When water droplets are flowing  on the camera lens
• When the vehicle height is  extremely changed (nose up, 
nose down, etc.)
• When tire chains or an emergency  tire puncture repair kit are used
• When the suspension has been  lowered or tires that have a differ-
ent size than the genuine tires are  installed
• When an aftermarket electronic  part (backlit license plate, fog 
light, etc.) is insta lled near the rear 
camera
• If a bumper protector, such as an 
additional trim strip, is installed to 
the rear bumper
■Situations in which the system 
may operate unexpectedly
●Even though there are no pedes-
trians in the detection area, some 
objects, such as the following, 
may be detected, possibly caus-
ing the rear camera detection 
function to operate.
• Three dimensional objects, such  as a pole, traffic cone, fence, or 
parked vehicle
• Moving objects, such as a car or  motorcycle
• Objects moving toward your vehi- cle when backing up, such as 
flags or puddles (or airborne mat-
ter, such as smoke, steam, rain, or 
snow)
• Cobblestone or gravel roads, tram 
rails, road repair s, white lines, 
pedestrian crossings or fallen 
leaves on the road
• Metal covers (gratings), such as  those used for drainage ditches
• Objects reflected in a puddle or on 
a wet road surface
• Shadows on the road
●In some situations, such as the 
following, the rear camera detec-
tion function may operate even 
though there are no pedestrians in 
the detection area.
• When backing up toward the road-
side or a bump on the road
• When backing up toward an  incline/decline
• When the vehicle height is  extremely changed (nose up, 
nose down, etc.)
• If a bumper protector, such as an 
additional trim strip, is installed to 
the rear bumper
• When an aftermarket electronic 
part (backlit license plate, fog 
light, etc.) is insta lled near the rear  

3825-5. Using the driving support systems
camera
• If the orientation of the rear cam- era has been changed due to a 
collision or other impact, or 
removal and installation
• If a towing eyelet is installed to the 
rear of the vehicle
• When towing with the vehicle
• When water is flowing over the  rear camera lens
• When the rear camera is  obscured (dirt, snow, ice, etc. are 
attached) or scratched
• If there is a flashing light in the  detection area, such as the emer-
gency flashers of another vehicle
• When tire chains or an emergency  tire puncture repair kit are used.
●Situations in which the rear cam-
era detection function may be diffi-
cult to notice
• The buzzer may be difficult to hear  if the surrounding area is noisy or 
the audio system volume is high.
• If the temperature in the cabin is  extremely high or low, the Multi-
media Display may not operate 
correctly.
*: If equipped
PKSB (Parking Sup-
port Brake)*
The PKSB (Parking Support 
Brake) is a system that 
issues warnings and auto-
matically performs braking 
to help reduce collision 
damage with operation tar-
gets that were detected 
when traveling at a low 
speed such as when park-
ing.
This system consists of the 
following functions: a Park-
ing Support Brake function 
(static objects to the front 
and rear) that detects static 
objects such as walls, a 
Parking Support Brake 
function (rear-crossing 
vehicles)
* that detects vehi-
cles approaching from the 
rear while backing up, a 
Parking Support Brake 
function (rear pedestrians)
* 
that detects pedestrians 
behind the vehicle, and a 
Parking Support Brake 
function (static objects 
around the vehicle) (vehi-
cles with Advanced Park) 
that detects static objects 
around the vehicle.
*: If equipped 
![TOYOTA PRIUS PRIME 2023  Owners Manual 3845-5. Using the driving support systems
All of the Parking Support Brake 
functions (static objects to the 
front and rear, rear-crossing 
vehicles [if equipped], rear 
pedestrians [if equipped], an TOYOTA PRIUS PRIME 2023  Owners Manual 3845-5. Using the driving support systems
All of the Parking Support Brake 
functions (static objects to the 
front and rear, rear-crossing 
vehicles [if equipped], rear 
pedestrians [if equipped], an](/manual-img/14/68572/w960_68572-383.png)
3845-5. Using the driving support systems
All of the Parking Support Brake 
functions (static objects to the 
front and rear, rear-crossing 
vehicles [if equipped], rear 
pedestrians [if equipped], and 
static objects around the vehicle 
[vehicles with Advanced Park]) 
are enabled/disabled simultane-
ously.
The Parking Support Brake 
function can be enabled/dis-
abled on   of the multi-infor-
WARNING
●When inspecting the vehicle 
using a chassis roller, chassis 
dynamo or free roller
●When loading the vehicle onto a 
boat, truck or other transport 
vessel
●If the suspension has been 
modified or tires of a size other 
than specified are installed
●If the front of the vehicle is 
raised or lowered due to the 
carried load
●When equipment that may 
obstruct a sensor is installed, 
such as a towing eyelet, trans-
port hook, bumper protector (an 
additional trim strip, etc.), bicy-
cle carrier, or snow plow
●When using automatic car 
washing devices
●If the vehicle cannot be driven in 
a stable manner, such as when 
the vehicle has been in an acci-
dent or is malfunctioning
●When the vehicle is driven in a 
sporty manner or off-road
●When the tires are not properly 
inflated
●When the tires are very worn
●When tire chains, a compact 
spare tire or an emergency tire 
puncture repair kit are used.
●When towing with the vehicle
■Precautions for the suspen-
sion
Do not modify the suspension of 
the vehicle. If the height or tilt of 
the vehicle is changed, the sen-
sors may not be able to detect 
detectable objects and the system 
may not operate correctly, possi-
bly leading to an accident.
NOTICE
■If “System Stopped See 
Owner’s Manual” is displayed 
on the multi-information dis-
play and the driving assist 
information indi cator is illu-
minated
If this message is displayed 
immediately after the power 
switch is changed to ON, operate 
the vehicle carefully, paying atten-
tion to your surr oundings. It may 
be necessary to drive the vehicle 
for a certain amount of time 
before the system returns to nor-
mal. (If the system is not return to 
normal after driv ing for a while, 
clean the sensor or rear camera 
lens.)
Enabling/Disabling the 
Parking Support Brake 

3985-5. Using the driving support systems
WARNING
●Do not allow anyone to put their 
hands outside of a window while 
this system is operating.
■To ensure correct operation 
of the Advanced Park
Observe the following precau-
tions. Failing to do so may result 
in the vehicle being unable to be 
driven safely and possibly cause 
an accident.
●Do not use this system in situa-
tions such as the following:
• When in areas other than com- mon parking spaces
• When the surface of the parking  space is sand or gravel and is 
not clearly defined with parking 
space lines
• When the parking space is not  level, such as when on a slope 
or has differences in height
• Mechanical parking system
• Parking lot with a device which  raises to contact the bottom of 
the vehicle
• When the road surface is fro- zen, slick, or covered with snow
• When it is extremely hot and the  asphalt is melting
• When there are objects around  the vehicle
• When there is an object  between your vehicle and the 
target parking spot or within the 
target parking spot (within the 
displayed blue box)
• When there is a gutter between  your vehicle and the target park-
ing space or within the target 
parking spot (within the dis-
played blue box)
• When there is a hole or gutter in  the exit direction
• When in high pedestrian or  vehicle traffic areas
• When the parking space is in a  location that is difficult to park in 
(too narrow for your vehicle, 
etc.)
• When images are unclear due  to dirt or snow attached to the 
camera lens, light  being shined 
into the camera or shadows
• When tire chains or a compact  spare tire is installed to the vehi-
cle
• When the doors or back door  are not completely closed
• When an arm is held outside of  a window
• In inclement weather such as  heavy rain or snow
●Make sure to use only standard 
sized tires, such as those that 
were installed to the vehicle 
when it was shipped from the 
factory. Otherwise, Advanced 
Park may not operate properly. 
Also, when the tires have been 
replaced, the displayed position 
of the lines or box displayed on 
the screen may become incor-
rect. When replacing the tires, 
contact your Toyota dealer.
●In situations such as the follow-
ing, it may not be possible for 
the system to provide assis-
tance to a registered parking 
spot:
• When the tires are extremely  worn or the tire  inflation pres-
sure is low
• When carrying a heavy load
• When the vehicle is tilted due to  the carried load 

4275-5. Using the driving support systems
5
Driving
■Secondary Collision Brake 
operating conditions
The system operates when the SRS 
airbag sensor detects a collision 
while the vehicle is in motion. 
However, the system does not oper-
ate when the components are dam-
aged.
■Secondary Collision Brake 
automatic cancellation
The system is automatically can-
celed in any of the following situa-
tions.
●The vehicle speed drops to 
approximately 0 mph (0 km/h).
●A certain amount of time elapses 
during operation
●The accelerator pedal is 
depressed a large amount
WARNING
■The ABS does not operate 
effectively when
●The limits of tire gripping perfor-
mance have been exceeded 
(such as excessively worn tires 
on a snow-covered road).
●The vehicle hydroplanes while 
driving at high speed on wet or 
slick roads.
■Stopping distance when the 
ABS is operating may exceed 
that of normal conditions
The ABS is not designed to 
shorten the vehicle’s stopping dis-
tance. Always maintain a safe dis-
tance from the vehicle in front of 
you, especially in  the following sit-
uations:
●When driving on dirt, gravel or 
snow-covered roads
●When driving with tire chains
●When driving over bumps in the 
road
●When driving over roads with 
potholes or uneven surfaces
■TRAC/VSC may not operate 
effectively when
Directional control and power may 
not be achievable while driving on 
slippery road surfaces, even if the 
TRAC/VSC system is operating. 
Drive the vehicle carefully in con-
ditions where stability and power 
may be lost.
■Active Cornering Assist does 
not operate effectively when
●Do not overly rely on Active 
Cornering Assist. Active Corner-
ing Assist may not operate 
effectively when accelerating 
down slopes or driving on slip-
pery road surfaces.
●When Active Cornering Assist 
frequently operates, Active Cor-
nering Assist may temporarily 
stop operating to ensure proper 
operation of the brakes, TRAC 
and VSC.
■Hill-start assist control does 
not operate effectively when
●Do not overly rely on hill-start 
assist control. Hill-start assist 
control may not operate effec-
tively on steep inclines and 
roads covered with ice.
●Unlike the parking brake, hill-
start assist control is not 
intended to hold the vehicle sta-
tionary for an extended period 
of time. Do not attempt to use 
hill-start assist control to hold 
the vehicle on an incline, as 
doing so may lead to an acci-
dent. 

4295-6. Driving tips
5
Driving
5-6.Driving tips
Use fluids that are appropriate 
to the prevailing outside tem-
peratures.
• Engine oil
• Engine coolant
• Power control unit coolant
• Washer fluid
Have a service technician 
inspect the condition of the 
12-volt battery.
 Have the vehicle fitted with 
four snow tires or purchase a 
set of tire chains for the front 
tires.
*
Ensure that all tires are the same 
size and brand, and that chains 
match the size of the tires.
*: Tire chains cannot be mounted 
on vehicles with 195/50R19 tires.
Winter driving tips
Carry out the necessary 
preparations and inspec-
tions before driving the 
vehicle in winter. Always 
drive the vehicle in a man-
ner appropriate to the pre-
vailing weather conditions.
Preparation for winter
WARNING
■Driving with snow tires
Observe the following precautions 
to reduce the risk of accidents.
Failure to do so may result in a 
loss of vehicle control and cause 
death or serious injury.
●Use tires of the specified size.
●Maintain the recommended 
level of air pressure.
●Do not drive in excess of 75 
mph (120 km/h), regardless of 
the type of snow tires being 
used.
●Use snow tires on all, not just 
some wheels.
■Driving with tire chains 
(except 195/50R19 tires)
Observe the following precautions 
to reduce the risk of accidents.
Failure to do so may result in the 
vehicle being unable to be driven 
safely, and may cause death or 
serious injury.
●Do not drive in excess of the 
speed limit specified for the tire 
chains being used, or 30 mph 
(50 km/h), whichever is lower.
●Avoid driving on bumpy road 
surfaces or over potholes.
●Avoid sudden acceleration, 
abrupt steering, sudden brak-
ing and shifting operations that 
cause sudden engine braking.
●Slow down sufficiently before 
entering a curve to ensure that 
vehicle control is maintained.
●Do not use LTA (Lane Tracing 
Assist) system.
●Do not use LDA (Lane Depar-
ture Alert) system.