TOYOTA PRIUS 2021 Owners Manual (in English)

PRIUS_OM_OM47E09U_(U)
3214-5. Using the driving support systems
4
Driving
■Warning message
If the following warning message is displayed on the multi-info rmation display
and the LTA indicator illuminates in orange, follow the appropr iate 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 insp ected by
your Toyota dealer.
● “LTA Unavailable”
The system is temporarily canceled due to a malfunction in a se nsor other
than the front camera. Turn the LTA system off, wait for a litt le 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 LT A opera-
tion range. Drive slower.
■ Customization
Function settings can be changed.
(Customizable features: P. 151)

322
PRIUS_OM_OM47E09U_(U)
4-5. Using the driving support systems
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 ac tions, etc. according to the rec ognized
road signs, it notifies the driv er 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 s upports
the driver by providing information, but it is not a replacemen t for a driver’s
own vision and awareness. Drive safely by always paying careful attention
to the traffic rules.

PRIUS_OM_OM47E09U_(U)
3234-5. Using the driving support systems
4
Driving
When the front camera recognize s a sign, the sign will be displayed
on the main display or m ulti-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. 124)
● 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. 1 1 5 )
• 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 sig ns, including electronic signs a nd 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 limitDo Not Enter
StopYield

324
PRIUS_OM_OM47E09U_(U)
4-5. Using the driving support systems
In the following situations, the RSA syst em will notify the driver.
● When the vehicle speed exceeds the speed notification threshold of
the speed limit sign displayed, the sign display will be emphas ized
and a buzzer will sound.
● When the RSA system recognizes a do not enter sign and deter-
mines that your vehicle has ent ered a no-entry area, the displayed
sign will flash and a buzzer will sound.
Depending on the situation, a not ification function may not operate
properly.
■ Setting procedure
P. 151
■ Automatic turn-off of RSA sign display
In the following situations, a displayed speed limit sign and/o r 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 bei ng 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 do es 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 incorr ectly.
● 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

PRIUS_OM_OM47E09U_(U)
3254-5. Using the driving support systems
4
Driving
●A sign resembling a system compatible sign is recognized.
● Side road speed signs may be detected and displayed (if positio ned 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 round about.
● 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 sig n 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. 690)

326
PRIUS_OM_OM47E09U_(U)
4-5. Using the driving support systems
Dynamic radar cruise controlwith full-speed
range

In vehicle-to-vehicle distance control mode, the vehicle automa tically
accelerates, decelerates and st ops to match the speed changes o f the
preceding vehicle even if the acc elerator pedal is not depressed. In
constant speed control mode, t he vehicle runs at a fixed speed.
Use the dynamic radar cruise control with full-speed range on f ree-
ways and highways.
● Vehicle-to-vehicle distance control mode ( P. 330)
● Constant speed c ontrol mode (P. 337)
Vehicle-to-vehicle distance
switch
Indicators
Multi-information display
Set speed
Cruise control switch
: If equipped
Summary of functions
System Components
1
2
3
4
5

PRIUS_OM_OM47E09U_(U)
3274-5. Using the driving support systems
4
Driving
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 li mitations 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. 340
• Conditions under which the vehicle-to-vehicle distance control mode
may not function correctly: P. 341
● Set the speed appropriately depending on the speed limit, traff ic 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 remai n alert,
assess the danger of each situation and drive safely. Relying s olely 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 s etting to off
using the “ON-OFF” button when not in use.

328
PRIUS_OM_OM47E09U_(U)
4-5. Using the driving support systems
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 se rious 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 approp riately in
order to ensure the safety of all involved.

PRIUS_OM_OM47E09U_(U)
3294-5. Using the driving support systems
4
Driving
WARNING
■Situations unsuitable for dynamic radar cruise control with ful l-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 ca use 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 s harp up
and down gradients
Vehicle speed may exceed the set speed when driving down a stee p 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 rada r 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

330
PRIUS_OM_OM47E09U_(U)
4-5. Using the driving support systems
This mode employs a radar to detect the presence of vehicles up to
approximately 328 ft. (100 m) ahead, determines the current veh icle-
to-vehicle following distance, and operates to maintain a suita ble fol-
lowing distance from the vehicle ahead. The desired vehicle-to- vehi-
cle distance can also be set by operating the vehicle-to-vehicl e
distance switch.
When driving on downhill slopes, the vehicle-to-vehicle distance may
become shorter.
Driving in vehicle-to-vehi cle distance control mode