Toyota SIENNA 2022 Manual page 315

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4-5. Using the driving support systems
Also, due to ice forming on a sensor
at low temperatures, a warning
message may be displayed or the
sensor may not be able to detect an
object. Once the ice melts, the sys-
tem will return to normal.
If a warning message is displayed
even if the sensor is clean, there
may be a sensor malfunction. Have
the vehicle inspected by your
Toyota dealer.
■ If "Parking Assist Unavailable"
is displayed on the multi-infor-
mation display
Water may be continuously flowing
over the sensor surface, such as in
a heavy rain. When the system
determines that it is normal, the sys-
tem will return to normal.
■ Sensor detection information
● The sensor's detection areas are
limited to the areas around the
vehicle's front and rear bumpers.
● The following situations may occur
during use.
• Depending on the shape of the
object and other factors, the
detection distance may shorten,
or detection may be impossible.
• Detection may be impossible if
static objects draw too close to the
sensor.
• There will be a short delay
between static object detection
and display (warning buzzer
sounds). Even at low speeds,
there is a possibility that the object
will come within approximately
11.9 in. (30 cm) before the display
is shown and the warning buzzer
sounds.
• It might be difficult to hear the
buzzer due to the volume of the
audio system or air flow noise of
the air conditioning system.
• It may be difficult to hear the
sound of this system due to the
buzzers of other systems.
■ Objects which the system may
not properly detect
The shape of the object may pre-
vent the sensor from detecting it.
Pay particular attention to the fol-
lowing objects:
● Wires, fences, ropes, etc.
● Cotton, snow and other materials
that absorb sound waves
● Sharply-angled objects
● Low objects
● Tall objects with upper sections
projecting outwards in the direc-
tion of your vehicle
People may not be detected if they
are wearing certain types of cloth-
ing.
■ Situations in which the system
may not operate properly
Certain vehicle conditions and the
surrounding environment may affect
the ability of a sensor to correctly
detect objects. Particular instances
where this may occur are listed
below.
● There is dirt, snow or ice on a sen-
sor. (Cleaning the sensors will
resolve this problem.)
● A sensor is frozen. (Thawing the
area will resolve this problem.)
In especially cold weather, if a sen-
sor is frozen the sensor display may
be displayed abnormally, or objects,
such as a wall, may not be detected.
● When a sensor or the area around
a sensor is extremely hot or cold.
● On an extremely bumpy road, on
an incline, on gravel, or on grass.
● When vehicle horns, vehicle