
306
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4-5. Using the driving support systems
• If the wheels are misaligned
• If a wiper blade is blocking the front camera
• The vehicle is being driven at extremely high speeds
• When driving on a hill
• If the radar sensor or front camera is misaligned
● In some situations such as the following, sufficient braking fo rce may not be
obtained, preventing the system from performing properly:
• If  the  braking  functions  cannot  operate  to  their  full  extent,  such  as  when
the brake parts are extremely cold, extremely hot, or wet
• If  the  vehicle  is  not  properly  maintained  (brakes  or  tires  are   excessively
worn, improper tire inflation pressure, etc.)
• When  the  vehicle  is  being  driven  on  a  gravel  road  or  other  sli ppery  sur-
face
■ If VSC is disabled
●If VSC is disabled ( P. 422), the pre-collision brake assist and pre-collision
braking functions are also disabled.
● The PCS warning light will turn on and “VSC Turned Off Pre-Coll ision Brake
System Unavailable” will be displayed on the multi-information  display.
• If  the  front  of  the  vehicle  is  raised  or
lowered 

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4-5. Using the driving support systems
WARNING
■Before using LTA system
● Do  not  rely  solely  upon  the  LTA  system.  The  LTA  system  does  not   auto-
matically  drive  the  vehicle or reduce the amount  of attention that must be
paid to the area in front of the vehicle. The driver must always assume full
responsibility for driving safely by paying careful attention to the surround-
ing  conditions  and  operating  the  steering  wheel  to  correct  the  path  of  the
vehicle. Also,  the  driver  must  take  adequate  breaks  when  fatigu ed,  such
as from driving for a long period of time.
● Failure to perform appropriate driving operations and pay caref ul attention
may lead to an accident, resulting in death or serious injury.
● When not using the LTA system, use the LTA switch to turn the system off.
■ Situations unsuitable for LTA system
In the following situations, use the LTA switch to turn the system off. Failure
to do so may lead to an accident, resulting in death or serious injury.
● Vehicle is driven on a road surface which is slippery due to rainy weather,
fallen snow, freezing, etc.
● Vehicle is driven on a snow-covered road.
● White (yellow) lines are difficult to see due to rain, snow, fo g, dust, etc.
● Vehicle is driven in a temporary lane or restricted lane due to  construction
work.
● Vehicle is driven in a construction zone.
● A spare tire, tire chains, etc. are equipped.
● When the tires have been excessively worn, or when the tire inf lation pres-
sure is low.
● During emergency towing.
■ Preventing  LTA  system  malfunctions  and  operations  performed  by
mistake
● Do  not  modify  the  headlights  or  place  stickers,  etc.  on  the  sur face  of  the
lights.
● Do  not  modify  the  suspension  etc.  If  the  suspension  etc.  needs  to  be
replaced, contact your Toyota dealer.
● Do not install or place anything on the hood or grille. Also, d o not install a
grille guard (bull bars, kangaroo bar, etc.).
● If your windshield needs repairs, contact your Toyota dealer. 

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4-5. Using the driving support systems
WARNING
●There  are  shadows  on  the  road  that  run  parallel  with,  or  cover,   the  white
(yellow) lines.
● The  vehicle  is  driven  in  an  area  without  white  (yellow)  lines,  such  as  in
front of a tollgate or checkpoint, or at an intersection, etc.
● The  white  (yellow)  lines  are  cracked,  “Botts’  dots”,  “Raised  pa vement
marker” or stones are present.
● The white (yellow) lines cannot be seen or are difficult to see  due to sand,
etc.
● The  vehicle  is  driven  on  a  road  surface  that  is  wet  due  to  rain ,  puddles,
etc.
● The traffic  lines  are yellow  (which may  be  more  difficult  to recognize  than
lines that are white).
● The white (yellow) lines cross over a curb, etc.
● The vehicle is driven on a bright surface, such as concrete.
● If the edge of the road is not clear or straight.
● The vehicle is driven on a surface that is bright due to reflec ted light, etc.
●Vehicle  is  driven  where  the  road
diverges, merges, etc.
● Repair  marks  of  asphalt,  white  (yellow)
lines,  etc.  are  present  due  to  road
repair. 

PRIUS_OM_OM47E09U_(U)
3114-5. Using the driving support systems
4
Driving
WARNING
●The  vehicle  is  driven  in  an  area  where  the  brightness  changes  suddenly,
such as at the entrances and exits of tunnels, etc.
● Light from the headlights of an oncoming vehicle, the sun, etc.  enters the
camera.
● The vehicle is driven on a slope.
● The vehicle is driven on a road which tilts left or right, or a  winding road.
● The vehicle is driven on an unpaved or rough road.
● The traffic lane is excessively narrow or wide.
● The  vehicle  is  extremely  tilted  due  to  carrying  heavy  luggage  o r  having
improper tire pressure.
● The distance to the preceding vehicle is extremely short.
● The vehicle is moving up and down a large amount due to road co nditions
during driving (poor r oads or road seams).
● When driving in a tunnel or at night with the headlights off or when a head-
light is dim due to its lens being dirty or it being misaligned .
● The vehicle is struck by a crosswind.
● The vehicle is affected by wind from a vehicle driven in a near by lane.
● The vehicle has just changed lanes or crossed an intersection.
● Tires  which  differ  by  structure,  manufacturer,  brand  or  tread  p attern  are
used.
● When tires of a size other than specified are installed.
● Snow tires, etc. are equipped.
● The vehicle is being driven at extremely high speeds. 

PRIUS_OM_OM47E09U_(U)
3314-5. Using the driving support systems
4
Driving
Example of constant speed cruising
When there are no  vehicles ahead
The vehicle travels at the speed set by the driver.
Example of deceleration crui sing 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  s peed  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  su ffi-
ciently to prevent your vehicle fr om 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 (st art-off opera-
tion)  will  resume  follow-up  cruising.  If  the  start-off  operatio n  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  vehi cle  will
accelerate to help to overtake a passing vehicle.
The  system’s  identification  of  what  is  an  overtaking  lane  may  b e  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 fr om where the
vehicle is normally driven, the vehicle may accelerate when the  turn signal
lever is operated in the opposite direction to the overtaking l ane (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  syst em  then
returns to constant speed cruising.
1
2
3 

PRIUS_OM_OM47E09U_(U)
3534-5. Using the driving support systems
4
Driving
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  bum per  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 surround ing 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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PRIUS_OM_OM47E09U_(U)
4-5. Using the driving support systems
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  w ill  resolve
this problem.)
● The sensor is frozen. (Thawing the area will resolve this probl em.) 
In  especially  cold  weather,  if  a  sensor  is  frozen,  the  screen  m ay  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,  moto rcycle
engines, air brakes of large vehicles, or other loud noises pro ducing 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 in stalled.
● There is another vehicle equipped with parking assist sensors i n the vicin-
ity.
● Towing eyelets are installed.
● A backlit license plate is installed.
In addition to the examples above, depending on the shape and c ondition of
obstacles,  detection  may  not  be  possible,  or  the  detection  rang e  may  be
shortened. 

PRIUS_OM_OM47E09U_(U)
3834-5. Using the driving support systems
4
Driving
●Influence from other sonic waves
• An  ultrasonic  wave  source  is  nearby,  such  as  the  horn  or  parki ng  assist
sensors of another vehicle, a vehicle detector, a motorcycle en gine 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 c arried 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  Parkin g
Guidance System is operating
P. 388
■ When removing and instal ling the 12-volt battery
The system needs to be initialized.
The system can be initialized by driving the vehicle straight a head for 5 sec-
onds or more at a speed of approximately 22 mph (35 km/h) or hi gher.
■ 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 du e 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  i nspected  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  m ulti-
information  display,  the  PKSB  OFF  indicator  flashes  and  the  buz zer
sounds
The  system  may  not  be  operating  properly.  Have  the  vehicle  inspected  at
your Toyota dealer.