2017 TOYOTA PRIUS PRIME sensor

PRIUS PRIME_OM_OM47A88U_(U)
3895-5. Using the driving support systems
5
Driving
■Warning message
If the following warning message is displayed on the multi-information dis-
play, follow the appropriate troubleshooting procedure.
If a different warning message is displayed, follow the instructions displayed
on the screen.
Warning messageDetails/Actions
“Lane Departure Alert
Malfunction
Visit Your Dealer”The system may not be operating
properly.
→ Have the vehicle inspected at your
Toyota dealer.
“Forward Camera
System
Unavailable
Clean Windshield”
Dirt, rain, condensation, ice, snow,
etc. are present on the windshield in
front of the camera sensor.
→ Turn the LDA system off, remove
any dirt, rain, condensation, ice,
snow, etc. from the windshield, and
then turn the LDA system back on.
“Forward Camera
System
Unavailable”
The operation conditions of the cam-
era sensor (temperature, etc.) are not
met.
→ When the operation conditions of
the camera sensor (temperature,
etc.) are met, the LDA system will
become available. Turn the LDA
system off, wait for a little while,
and then turn the LDA system back
on.
“Lane Departure Alert
Unavailable”
The LDA system is temporarily can-
celed due to a malfunction in a sensor
other than the camera sensor.
→Turn the LDA system off and follow
the appropriate troubleshooting
procedures for the warning mes-
sage. Afterward, drive the vehicle
for a short time, and then turn the
LDA system back on.
“Lane Departure Alert
System is Unavailable
Below Approx. 32 MPH.”The LDA system cannot be used as
the vehicle speed is less than approxi-
mately 32 mph (50 km/h).
→ Drive the vehicle at approximately
32 mph (50 km/h) or more.

PRIUS PRIME_OM_OM47A88U_(U)
3935-5. Using the driving support systems
5
Driving
WARNING
■To avoid inadvertent dynamic rada r cruise control with full-speed
range activation
Switch the dynamic radar cruise control with full-speed range off using the
“ON-OFF” button when not in use.
■ 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, cyclers, 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 sensor or
camera sensor
● In traffic conditions that require frequent repeated acceleration and decel-
eration
● When your vehicle is during emergency towing
● When an approach warning buzzer is heard often

394
PRIUS PRIME_OM_OM47A88U_(U)
5-5. Using the driving support systems
This mode employs a radar sensor 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 suit-
able following distance from the vehicle ahead.
Note that vehicle-to-vehicle distance will close in when traveling on long
downhill slopes.
Driving in vehicle-to-vehicle distance control mode

PRIUS PRIME_OM_OM47A88U_(U)
4015-5. Using the driving support systems
5
Driving
When constant speed control mode is selected, your vehicle will main-
tain a set speed without controllin g the vehicle-to-vehicle distance.
Select this mode only when vehicle-to-vehicle distance control mode
does not function co rrectly due to a dirty radar sensor, etc.
With the cruise control off,
press and hold the “ON-OFF”
button for 1.5 seconds or more.
Immediately after the “ON-OFF”
button is pressed, the radar cruise
control indicator will come on.
Afterwards, it switches to the cruise
control indicator.
Switching to constant speed con-
trol mode is only possible when
operating the lever with the cruise
control off.
Accelerate or decelerate, with
accelerator pedal operation, to
the desired vehicle speed
(above approximately 30 mph
[50 km/h]) and push the lever
down to set the speed.
Cruise control “SET” indicator will
come on.
The vehicle speed at the moment
the lever is released becomes the
set speed.
Adjusting the speed setting: →P. 397
Canceling and resuming the speed setting: →P. 399
Selecting constant speed control mode
1
2

402
PRIUS PRIME_OM_OM47A88U_(U)
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.
● Vehicle speed is above approximately 30 mph (50 km/h).
However, when a preceding vehicle is detected, the dynamic radar cruise
control with full-speed range can be set even if the vehicle speed is at or
below approximately 30 mph (50 km/h).
■ Accelerating after setting the vehicle speed
The vehicle can accelerate by operating the accelerator pedal. After acceler-
ating, the set speed resumes. However, during vehicle-to-vehicle distance
control mode, the vehicle speed may decrease below the set speed in order
to maintain the distance to the preceding vehicle.
■ Automatic cancelation of vehicle-t o-vehicle distance control mode
Vehicle-to-vehicle distance control mode is automatically canceled in the fol-
lowing situations.
● Actual vehicle speed falls below approximately 25 mph (40 km/h) when
there are no vehicles ahead.
● The preceding vehicle leaves the lane when your vehicle is following at a
vehicle speed below approximately 25 m ph (40 km/h). Otherwise, the sen-
sor can not properly detect the vehicle.
● VSC is activated.
● TRAC is activated for a period of time.
● When the VSC or TRAC system is turned off by pressing the VSC OFF
switch.
● The sensor cannot detect correctly because it is covered in some way.
● Pre-collision braking is activated.
● Intelligent Clearance Sonar is operated. (if equipped)
● The parking brake is operated.
● The vehicle is stopped by system control on a steep incline.
● The following are detected when the vehicle has been stopped by system
control:
• The driver is not wearing a seat belt.
• The driver’s door is opened.
• The vehicle has been stopped for about 3 minutes.
In this situation, the shift position may automatically switch to P. ( →P. 333)
If vehicle-to-vehicle distance control mode is automatically canceled for any
other reason, there may be a malfunction in the system. Contact your Toyota
dealer.

404
PRIUS PRIME_OM_OM47A88U_(U)
5-5. Using the driving support systems
■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. 400) will 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

PRIUS PRIME_OM_OM47A88U_(U)
4055-5. Using the driving support systems
5
Driving
■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 the road curves or when the lanes
are narrow
● When steering wheel operation or your
position in the lane is unstable

408
PRIUS PRIME_OM_OM47A88U_(U)
5-5. Using the driving support systems
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 t he 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