2017 TOYOTA PRIUS C sensor

2364-5. Using the driving support systems
PRIUS c_U (OM52J11U)■
Situations in which the system may not operate properly
●In some situations such as the following, a vehicle may not be detected by
the front sensor, preventing the system from operating properly:
• If an oncoming vehicle is approaching your vehicle
• When approaching the side or front of a vehicle
• If a preceding vehicle has a small rear end, such as an unloaded truck
• If a vehicle ahead is carrying a load which protrudes past its rear bumper
• If a vehicle ahead is irregularly shaped, such as a tractor or side car
• If the sun or other light is shining directly on a vehicle ahead
• If a vehicle ahead makes an abrupt maneuver (such as sudden swerving,
acceleration or deceleration)
• When suddenly cutting behind a preceding vehicle • If a preceding vehicle has a low rear end, such as a low bed trailer
• If a vehicle ahead has extremely high ground clearance
• If a vehicle cuts in front of your vehicle or emerges from beside a vehicle

2374-5. Using the driving support systems
4
Driving
PRIUS c_U (OM52J11U)• When the vehicle is hit by water, snow, dust, etc. from a vehicle ahead
• When driving through steam or smoke that may obscure vehicles ahead
• When driving in a place where the surrounding brightness changes sud-
denly, such as at the entrance or exit of a tunnel
• While driving on a curve and for a certain amount of time after driving on a curve
• When a vehicle ahead is not directly
in front of your vehicle
• When driving in inclement weather such as heavy rain, fog, snow or a
sand storm
• When a very bright light, such as the sun or the headlights of oncoming
traffic, shines directly into the front
sensor
• When the surrounding area is dim, such as at dawn or dusk, or while at
night or in a tunnel

2384-5. Using the driving support systems
PRIUS c_U (OM52J11U)• If the wheels are misaligned
• If a wiper blade is blocking the front sensor
• The vehicle is wobbling.
• The vehicle is being driven at extremely high speeds.
• When driving on roads with sharp bends or uneven surfaces
• When a preceding vehicle is a poor reflector of laser
● In some situations such as the following, sufficient braking force 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 slippery sur- face
• If your vehicle is skidding
• When the front part of the vehicle is
raised or lowered
• When the sensor is misaligned due to a strong impact being applied to the
sensor, etc.

2394-5. Using the driving support systems
4
Driving
PRIUS c_U (OM52J11U)■
If the PCS warning light flashes a nd a warning message is displayed on
the multi-information display
The pre-collision system may be tem porarily unavailable or there may be a
malfunction in the system.
● In the following situations, the warning light will turn off, the message will
disappear and the system will become operational when normal operating
conditions return:
• When the area around the front sensor is hot, such as in the sun
• When the windshield is fogged up or covered with condensation or ice
(→ P. 376)
• When the front sensor or the area around either sensor is cold, such as in an extremely cold environment
• If the area in front of the front sensor is obstructed, such as when the hood is open
● If the PCS warning light continues to flash or the warning message does not
disappear, the system may be malfunctioning. Have the vehicle inspected
by your Toyota dealer immediately.
■ If VSC is disabled
●If TRAC and VSC are disabled ( →P. 265), the pre-collision brake assist and
pre-collision braking functions are also disabled. However, the pre-collision
warning function will still operate.
● The PCS warning light illuminates and “VSC TURNED OFF PRE-COLLI-
SION BRAKE SYSTEM UNAVAILABLE” is displayed on the multi-informa-
tion display.

2404-5. Using the driving support systems
PRIUS c_U (OM52J11U)
When driving on roads with white (yello w) lines, this function alerts the
driver when the vehicle might depart from its lane.
The LDA system recognizes visi-
ble white (yellow) lines with the
front sensor on the upper portion
of the front windshield.
When the system determines that
the vehicle might depart from its
lane, a warning is displayed on
the multi-information display and
the warning buzzer sounds to
alert the driver.
When the warning buzzer sounds,
check the surrounding road situa-
tion and carefully operate the
steering wheel to move the vehicle
back to the center within the white
(yellow) lines.
LDA (Lane Depa rture Alert)∗
∗: If equipped
Summary of function
Lane departure alert function

2434-5. Using the driving support systems
4
Driving
PRIUS c_U (OM52J11U)
■Operation conditions
This function operates when all of the following conditions are met.
●LDA is turned on.
● Vehicle speed is approximately 32 mph (50 km/h) or more.
● System recognizes white (yellow) lines.
● Width of traffic lane is approximately 9.8 ft. (3 m) or more.
● Turn signal lever is not operated.
● Vehicle is driven on a straight road or around a gentle curve with a radius of
more than approximately 492 ft. (150 m).
● No system malfunctions are detected. ( →P. 477)
■ Temporary cancellation 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.
■ Lane departure alert function
The warning buzzer may be difficult to hear due to external noise, audio play-
back, etc.
■ White (yellow) lines are only on one side of road
The LDA system will not operate for the side on which white (yellow) lines
could not be recognized.
■ After the vehicle has been parked in the sun
The LDA system may not be available and a warning message may be dis-
played for a while after starting off. When the temperature in the cabin
decreases and the temperature around the front sensor ( →P. 223) becomes
suitable for its operation, the system will begin to operate.
■ If there are lane markers on only one side of the vehicle
The lane departure warning will not operate for the side on which lane mark-
ers could not be recognized.

2444-5. Using the driving support systems
PRIUS c_U (OM52J11U)■
Conditions in which functions may not operate properly
In the following situations, the front sensor may not detect white (yellow) lines
and various functions may not operate normally.
●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, or cat's eyes (reflective markers) 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.
● The vehicle is driven on a surface that is bright due to reflected light, etc.
● 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 where the road diverges, merges, etc.
● 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 vehicle is driven around a sharp curve.
● The traffic lane is excessively narrow or wide.
● The vehicle is extremely tilted due to carrying heavy luggage or 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 conditions
during driving (poor roads or road seams).
● The headlight lenses are dirty and emit a faint amount of light at night, or the
beam axis has deviated.
● The vehicle has just changed lanes or crossed an intersection.
■ Warning messages
Warning messages are used to indicate a system malfunction or to inform t\
he
driver of the need for caution while driving. ( →P. 486)
■ Customization
→P. 106

2454-5. Using the driving support systems
4
Driving
PRIUS c_U (OM52J11U)
Push the lever away from you
with the headlight switch in the position.
Press the Automatic High
Beam switch.
The Automatic High Beam indica-
tor will come on when the head-
lights are turned on automatically
to indicate that the system is
active.
Automatic High Beam∗
∗: If equipped
The Automatic High Beam uses an in-vehicle front sensor to
assess the brightness of streetlights, the lights of vehicles
ahead etc., and automatically turns the high beam on or off as
necessary.
WARNING
■ Limitations of the Automatic High Beam
Do not rely on the Automatic High Beam. Always drive safely, taking care to
observe your surroundings and turning the high beam on or off manually if
necessary.
■ To prevent incorrect operation of the Automatic High Beam system
Do not overload the vehicle.
Activating the Automatic High Beam system
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