sensor TOYOTA C-HR 2022 Repair Manual

4744-5. Using the driving support systems
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■ Situations in which the system may not operate properly
The RCTA function may not detect vehicles correctly in the foll owing situa-
tions:
● When the sensor is misaligned due to a strong impact to the sensor or its
surrounding area
● When mud, snow, ice, a sticker, etc., is covering the sensor or surrounding
area on the position above the rear bumper
● When driving on a road surface that is wet with standing water during bad
weather, such as heavy rain, snow, or fog
● When multiple vehicles are approaching with only a small gap between
each vehicle
● When a vehicle is approaching at high speed
● When equipment that may obstruct a sensor is installed, such as a towing
eyelet, bumper protector (an additional trim strip, etc.), bicy cle carrier, or
snow plow
● When towing a trailer
● When there is a significant difference in height between your vehicle and the
vehicle that enters the detection area
● When a sensor or the area around a sensor is extremely hot or cold
● If the suspension has been modified or tires of a size other than specified
are installed
● When backing up on a slope with a
sharp change in grade
● When backing out of a sharp angle park-
ing spot

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Driving
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● If the front of the vehicle is raised or lowered due to the carried load
■ Situations in which the system may operate even if there is no possibil-
ity of a collision
Instances of the RCTA function unnecessary detecting a vehicle and/or object
may increase in the following situations:
● When equipment that may obstruct a sensor is installed, such as a towing
eyelet, bumper protector (an additional trim strip, etc.), bicy cle carrier, or
snow plow
● When turning while backing up
● When a vehicle turns into the detection
area
● When the parking space faces a street
and vehicles are being driven on the
street
● When the distance between your vehicle
and metal objects, such as a guardrail,
wall, sigh, or parked vehicle, which may
reflect electrical waves toward the rear
of the vehicle, is short

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● When there are spinning objects near your vehicle such as the fan of an air
conditioning unit
● When water is splashed or sprayed toward the rear bumper, such as from a
sprinkler
● Moving objects (flags, exhaust fumes, large rain droplets or snowflakes, rain
water on the road surface, etc.)
● When the distance between your vehicle and a guardrail, wall, etc., that
enters the detection area is short
● Gratings and gutters
● When a sensor or the area around a sensor is extremely hot or cold
● 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 a vehicle passes by the side of
your vehicle
● When a detected vehicle turns while
approaching the vehicle

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Driving
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PKSB (Parking Suppor t Brake)
■Parking Support Brake function (static objects)
Ultrasonic sensors are used to detect static objects, such as a wall,
in the detection area when driving at a low speed or backing up .
( P. 485)
■Parking Support Brake function (rear-crossing vehicles) (if
equipped)
Rear radar sensors are used to detect approaching vehicles in t he
detection area behind the vehicle when backing up. ( P. 4 8 9 )
: If equipped
The Parking Support Brake system consists of the following
functions that operate when driving at a low speed or backing
up, such as when parking. When the system determines that a
collision with a detected object is high, a warning operates to
urge the driver to take evasive action. If the system determine s
that the possibility of a collision with a detected object is
extremely high, the brakes are automatically applied to help
avoid the collision or help reduce the impact of the collision.
PKSB (Parking Support Brake) system

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■If the Parking Support Brake has operated
If the vehicle is stopped due to operation of the Parking Suppo rt Brake, the
Parking Support Brake will be disabled and the PKSB OFF indicat or will illu-
minate. If the Parking Support Brake operates unnecessarily, br ake control
can be canceled by depressing the brake pedal or waiting for ap proximately 2
seconds for it to automatically be canceled. Then, the vehicle can be oper-
ated by depressing the accelerator pedal.
■ Re-enabling the Parking Support Brake
To re-enable the Parking Support Brake when it has been disabled due to oper-
ation of the Parking Support Brake, either enable the system ag ain (P. 478),
or turn the engine switch off and then back to ON.
Additionally, if any of the following conditions are met, the s ystem will be re-
enabled automatically and the PKSB OFF indicator will turn off:
● The P shift position is selected
● The object is no longer detected in the traveling direction of the vehicle
● The traveling direction of the vehicle changes
■ If “Parking Support Brake Unavailable” and “Parking assist unavailable.
Clean parking assist sensor” is displayed on the multi-informat ion dis-
play and the PKSB OFF indicator is flashing
● A sensor may be covered with ice, snow, dirt, etc. Remove any ice, snow,
dirt, etc., from the sensor to return the system to normal.
If this message continues to be displayed even after cleaning t he sensor, or
is displayed even though the sensor is clean, have the vehicle inspected
any authorized Toyota retailer, Toyota authorized repairer, or any reliable
repairer.
● It is possible the sensor may be frozen.
Once the ice melts, the system will return to normal.
● Water may be continuously flowing over the surface of the sensor.
When the system judges there is no problem, the system will ret urn to nor-
mal.
■ If a 12-volt battery terminal has been disconnected and reconnected
The system needs to be initialized. To initialize the system, d rive the vehicle
straight ahead for 5 seconds or more at a speed of approximatel y 35 km/h
(22 mph) or more. Additionally, fo r vehicles with the Parking Support Brake
function, turn the steering wheel fully to the left and right w ith the vehicle
stopped.

4844-5. Using the driving support systems
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WARNING
■Cautions regarding the use of the system
Do not overly rely on the system, as doing so may lead to an ac cident.
Always drive while checking the safety of the surroundings of t he vehicle.
Depending on the vehicle and road conditions, weather, etc., th e system
may not operate.
The detection capabilities of sensors and radars are limited. A lways drive
while checking the safety of the surroundings of the vehicle.
● The driver is solely responsible for safe driving. Always drive carefully, tak-
ing care to observe your surroundings. The Parking Support Brak e system
is designed to provide support to lessen the severity of collis ions. How-
ever, it may not operate in some situations.
● The Parking Support Brake system is not designed to stop the vehicle
completely. Additionally, even if the system has stopped the ve hicle, it is
necessary to depress the brake pedal immediately as brake contr ol will be
canceled after approximately 2 seconds.
● It is extremely dangerous to check the system operations by intentionally
driving the vehicle into the direction of a wall, etc. Never at tempt such
actions.
■ When to disable the Parking Support Brake
In the following situations, disable the Parking Support Brake as the system
may operate even though there is no possibility of a collision.
● 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, bumper protector (an addi tional trim strip, etc.), bicycle carrier, or
snow plow
● When using automatic car washing devices
● If the vehicle cannot be driven in a stable manner, such as when the vehi-
cle has been in an accident 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 a tire chains, compact spare tire or an emergency tire puncture
repair kit is used

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Parking Support Brake function (static
objects)
This function will operate in situations such as the following if an
object is detected in the traveling direction of the vehicle.
■When traveling at a low speed and the brake pedal is not
depressed, or is depressed late
: If equipped
If the sensors detect a static object, such as a wall, in the t ravel-
ing direction of the vehicle and the system determines that a c ol-
lision may occur due to the vehicle suddenly moving forward
due to an accidental accelerator pedal operation, the vehicle
moving the unintended direction due to the wrong shift lever
being selected, or while parking or traveling at low speeds, th e
system will operate to lessen the impact with the detected stat ic
object and reduce the resulting damage.
Examples of function operation

4864-5. Using the driving support systems
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■When the accelerator pedal is depressed excessively
■When the vehicle moves in the unintended direction due to the
wrong shift lever being selected
P. 456
Types of sensors

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■The Parking Support Brake function (static objects) will operate when
The function will operate when the PKSB OFF indicator is not il luminated or
flashing (P. 159, 161) and all of the following conditions are met:
● Hybrid system output restriction control
• The Parking Support Brake is enabled.
• The vehicle speed is approximately 15 km/h (9 mph) or less.
• There is a static object in the traveling direction of the veh icle and approx-
imately 2 to 4 m (6 to 13 ft.) away.
• The Parking Support Brake determines that a stronger-than-norm al brake
operation is necessary to avoid a collision.
● Brake control
• Hybrid system output restriction control is operating
• The Parking Support Brake determines that an immediate brake o pera-
tion is necessary to avoid a collision.
■ The Parking Support Brake function (static objects) will stop operating
when
The function will stop operating if any of the following condit ions are met:
● Hybrid system output restriction control
• The Parking Support Brake is disabled.
• The system determines that the collision has become avoidable with nor-
mal brake operation.
• The static object is no longer approximately 2 to 4 m (6 to 13 ft.) away
from the vehicle or in the traveling direction of the vehicle.
● Brake control
• The Parking Support Brake is disabled.
• Approximately 2 seconds have elapsed since the vehicle was sto pped by
brake control.
• The brake pedal is depressed after the vehicle is stopped by b rake con-
trol.
• The static object is no longer approximately 2 to 4 m (6 to 13 ft.) away
from the vehicle or in the traveling direction of the vehicle.
■ Detection range of the Parking Support Brake function (static objects)
The detection range of the Parking Support Brake function (stat ic objects) dif-
fers from the detection range of the Toyota parking assist-sens or. (P. 461)
Therefore, even if the Toyota parking assist-sensor detects an object and pro-
vides a warning, the Parking Support Brake function (static obj ects) may not
start operating.
■ Situations in which the system may not operate properly
P. 463
■ Situations in which the system may operate even if there is no possibil-
ity of a collision
P. 465

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4-5. Using the driving support systems
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Parking Support Brake function (rear-
crossing vehicles)
This function will operate in situations such as the following if a vehi-
cle is detected in the traveling direction of the vehicle.
■When reversing, a vehicle is approaching and the brake pedal
is not depressed, or is depressed late
P. 450
: If equipped
If a rear radar sensor detects a vehicle approaching from the
right or left at the rear of the vehicle and the system determi nes
that the possibility of a collision is high, this function will per-
form brake control to reduce the likelihood of an impact with t he
approaching vehicle.
Examples of function operation
Types of sensors