sensor TOYOTA SIENNA HYBRID 2021 (in English) Service Manual

2994-5. Using the driving support systems
4
Driving
●When steering wheel operation or
your position in the lane is unsta-
ble
●When the vehicle ahead of you
decelerates suddenly
●When driving on a road sur-
rounded by a structure, such as in
a tunnel or on a bridge
*: If equipped
BSM (Blind Spot Moni-
tor)*
The Blind Spot Monitor is a
system that has 2 functions:
The BSM (Blind Spot Moni-
tor) function
Assists the driver in making a
decision when changing lanes
 The RCTA (Rear Cross
Traffic Alert) function
Assists the driver when back-
ing up
These functions use the
same sensors.
WARNING
■Cautions regarding the use of
the BSM function
The driver is solely responsible for
safe driving. Always drive safely,
taking care to observe your sur-
roundings.
The BSM function is a supple-
mentary function which alerts the
driver that a vehicle is in a blind
spot of the outside rear view mir-
rors or is approaching rapidly from
behind into a blin d spot. Do not
overly rely on the BSM function.
As the function cannot judge if it is
safe to change lanes, over reli-
ance could lead to an accident
resulting in dea th or serious
injury.
As the system may not function
correctly under certain condi-
tions, the driver’s own visual con-
firmation of safety is necessary.

3014-5. Using the driving support systems
4
Driving
The BSM function and the
RCTA function can be
enabled/disabled on the
screen of the multi-information
display. (P.112) Each time the
power switch is turned off then
changed to ON, the BSM func-
tion//RCTA function will be
enabled automatically.
■Outside rear view mirror indica-
tors visibility
In strong sunlight, the outside rear
view mirror indicato r may be difficult
to see.
■Hearing the RCTA buzzer
The RCTA buzzer may be difficult to
hear over loud noises such as high
audio volume.
■When “Blind Spot Monitor
Unavailable” or “Rear Cross
Traffic Alert Unavailable” is
shown on the multi-information
display
The sensor voltage has become
abnormal, or water, snow, mud,
etc., may be built up in the vicinity of
the sensor area of the rear bumper.
(  P.301)
Removing the water, snow, mud,
etc., from the vicinity of the sensor
area should retur n it to normal.
Also, the sensor may not function
normally when used in extremely
hot or cold weather.
■When “Blind Spot Monitor Mal-
function Visit Your Dealer” or
“Rear Cross Traffic Alert Mal-
function Visit Your Dealer” is
shown on the multi-information
display
There may be a sensor malfunction
or misaligned. Have the vehicle inspected at a Toyota dealer.
■Customization
Some functions can be customized.
(  P.550)Turning the BSM func-
tion/RCTA function on/off
WARNING
■Handling the radar sensor
Blind Spot Monitor sensors are
installed inside t he left and right
sides of the rear bumper respec-
tively. Observe the following to
ensure the Blind Spot Monitor can
function correctly.
●Keep the sensors and the sur-
rounding areas on the rear
bumper clean at all times.
If a sensor or its surrounding
area on the rear bumper is dirty
or covered with snow, the Blind
Spot Monitor may not operate
and a warning message
(  P.301) will be displayed. In
this situation, clear off the dirt or
snow and drive the vehicle with
the operation conditions of the
BSM function ( P.303) satis-
fied for approximately 10 min-
utes. If the warning message
does not disappear, have the
vehicle inspected by your
Toyota dealer.

3024-5. Using the driving support systems
■Vehicles that can be detected by the Blind Spot Monitor
The BSM function uses radar sensors to detect the following veh i-
cles traveling in adjacent lanes and advises the driver of the pres-
ence of such vehicles via the indicators on the outside rear vi ew
mirrors.
WARNING
●Do not subject a sensor or its
surrounding area on the rear
bumper to a strong impact.
If a sensor is moved even
slightly off position, the system
may malfunction and vehicles
may not be detected correctly.
In the following si tuations, have
your vehicle inspected by your
Toyota dealer.
• A sensor or its surrounding area is subject to a strong impact.
• If the surrounding area of a sen- sor is scratched or dented, or
part of them has become dis-
connected.
●Do not disassemble the sensor.
●Do not attach accessories,
stickers (including transparent
stickers), aluminum tape, etc. to
a sensor or its surrounding area
on the rear bumper.
●Do not modify the sensor or sur-
rounding area on the rear
bumper.
●If a sensor or th e rear bumper
needs to be removed/installed
or replaced, contact your
Toyota dealer.
●Do not paint the rear bumper
any color other than an official
Toyota color.
The Blind Spot Monitor function

3044-5. Using the driving support systems
●The shift lever is in a position
other than R.
●The vehicle speed is greater than
approximately 10 mph (16 km/h).
■The BSM function will detect a
vehicle when
The BSM function will detect a vehi-
cle present in the detection area in
the following situations:
●A vehicle in an adjacent lane over-
takes your vehicle.
●You overtake a vehicle in an adja-
cent lane slowly.
●Another vehicle enters the detec-
tion area when it changes lanes.
■Conditions under which the
BSM function will not detect a
vehicle
The BSM function is not designed to
detect the following types of vehi-
cles and/or objects:
●Small motorcycles, bicycles,
pedestrians, etc.*
●Vehicles traveling in the opposite
direction
●Guardrails, walls, signs, parked
vehicles and similar stationary
objects
*
●Following vehicles that are in the
same lane*
●Vehicles traveling 2 lanes away
from your vehicle*
●Vehicles which are being over-
taken rapidly by your vehicle
*: Depending on the conditions, detection of a v ehicle and/or
object may occur.
■Conditions under which the
BSM function may not function
correctly
●The BSM function may not detect
vehicles correctly in the following
situations:
• When the sensor is misaligned due to a strong impact to the sen-
sor or its surrounding area
• When mud, snow, ice, a sticker, etc. is covering the sensor or sur-
rounding area on 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 the distance between your vehicle and a following vehicle is
short
• When there is a significant differ- ence in speed between your vehi-
cle and the vehicle that enters the
detection area
• When the difference in speed
between your vehicle and another
vehicle is changing
• When a vehicle enters a detection
area traveling at about the same
speed as your vehicle
• As your vehicle starts from a stop,
a vehicle remains in the detection
area
• When driving up and down con-
secutive steep inclines, such as
hills, dips in the road, etc.
• When driving on r oads with sharp
bends, consecutive curves, or
uneven surfaces
• When vehicle lanes are wide, or

3054-5. Using the driving support systems
4
Driving
when driving on the edge of a
lane, and the vehicle in an adja-
cent lane is far away from your
vehicle
• When an accessory (such as a hitch-mounted bicycle carrier) is
installed to the r ear of the vehicle
• When the vehicle is heavily loaded in the luggage compart-
ment
• When there is a significant differ- ence in height between your vehi-
cle and the vehicle that enters the
detection area
• Immediately after the BSM func-
tion/RCTA function are turned on
• When towing a trailer
●Instances of the BSM function
unnecessarily detecting a vehicle
and/or object may increase in the
following situations:
• When the sensor is misaligned
due to a strong impact to the sen-
sor or its surrounding area
• When the distanc e between your
vehicle and a guar drail, wall, etc.
that enters the detection area is
short
• When driving up and down con-
secutive steep inclines, such as
hills, dips in the road, etc.
• When vehicle lanes are narrow, or
when driving on the edge of a
lane, and a vehicle traveling in a
lane other than the adjacent lanes
enters the detection area
• When driving on roads with sharp bends, consecutive curves, or
uneven surfaces
• When the tires are slipping or spinning
• When the distanc e between your
vehicle and a following vehicle is
short
• When an accessory (such as a hitch-mounted bicycle carrier) is
installed to the r ear of the vehicle
• When the vehicle throws up water
or snow behind.
■Operation of the RCTA
function
The RCTA function uses radar
sensors to detect vehicles
approaching from the right or left
at the rear of the vehicle and
alerts the driver of the presence
of such vehicles by flashing the
outside rear view mirror indica-
tors and sounding a buzzer.
Approaching vehicles
Detection areas
■RCTA icon display (if
equipped)
When a vehicle approaching
from the right or left at the rear
of the vehicle is detected, the
following will be displayed on
the audio system screen.
 When the Toyota parking
assist monitor (if equipped) is
displayed
The Rear Cross Traffic
Alert function (if
equipped)
A
B

3064-5. Using the driving support systems
When the panoramic view
monitor (if equipped) is dis-
played
: The RCTA function is malfunc-
tioning ( P.301)
■The RCTA function detec-
tion areas
The areas that vehicles can be
detected in are outlined below.
The buzzer can alert the driver of
faster vehicles approaching from
farther away.
Example:
■The RCTA function is opera-
tional when
The RCTA function operates when
all of the followin g conditions are
met:
●The RCTA function is on.
●The shift lever is in R.
●The vehicle spe ed is less than
approximately 5 mph (8 km/h).
●The approaching vehicle speed is
between approximately 5 mph (8
km/h) and 17 mph (28 km/h).
■Setting the buzzer volume
The buzzer volume can be adjusted
on the multi-information display.
(  P.112)
■Conditions under which the
RCTA function will not detect a
vehicle
The RCTA function is not designed
to detect the follo wing types of vehi-
cles and/or objects.
●Vehicles approaching from
directly behind
●Vehicles backing up in a parking
space next to your vehicle
●Vehicles that the sensors cannot
detect due to obstructions
Approach-
ing vehicleSpeed

Approxi- mate
alert dis- tance
Fast18 mph
(28 km/h)65 ft. (20 m)
Slow5 mph (8 km/h)18 ft. (5.5 m)
A

3074-5. Using the driving support systems
4
Driving
●Guardrails, walls, signs, parked
vehicles and similar stationary
objects
*
●Small motorcycles, bicycles,
pedestrians, etc.*
●Vehicles moving away from your
vehicle
●Vehicles approaching from the
parking spaces next to your vehi-
cle
*
*
: Depending on conditions, detec- tion of a vehicle and/or object may
occur.
■Conditions under which the
RCTA function may not func-
tion correctly
●The RCTA function may not
detect vehicles correctly in the fol-
lowing situations:
• When the sensor is misaligned
due to a strong impact to the sen-
sor or its surrounding area
• When mud, snow, ice, a sticker, etc. is covering the sensor or sur-
rounding area on 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 parking on a steep incline, such as hills, a dip in the road, etc.
• When an accessory (such as a
hitch-mounted bicycle carrier) is
installed to the r ear of the vehicle
• When backing up on a slope with
a sharp change in grade • When backing out of a shallow
angle parking spot
• Immediately after the RCTA func- tion is turned on
• Immediately after the hybrid sys- tem is started with the RCTA func-
tion on
• When towing a trailer
• When the sensors cannot detect a vehicle due to obstructions
●Instances of the RCTA function
unnecessary detecting a vehicle
and/or object may increase in the
following situations:
• When a vehicle passes by the
side of your vehicle
• When the parking space faces a street and vehicles are being

3084-5. Using the driving support systems
driven on the street
• When the distanc e between your
vehicle and metal objects, such as
a guardrail, wall, sign, or parked
vehicle, which may reflect electri-
cal waves toward the rear of the
vehicle, is short
• When an accessory (such as a
hitch-mounted bicycle carrier) is
installed to the r ear of the vehicle
*: If equipped
■Location and types of sen-
sors
Front corner sensors
Front center sensors
Rear corner sensors
Rear center sensors
■Display (Multi-information
display)
When the sensors detect an
object, such as a wall, a graphic
is shown on the multi-informa-
Intuitive parking
assist*
The distance from your
vehicle to objects, such as a
wall, when parallel parking
or maneuvering into a
garage is measured by the
sensors and communicated
via the multi-information
display, audio system
screen and a buzzer. Always
check the surrounding area
when using this system.
System components
A
B
C
D

3094-5. Using the driving support systems
4
Driving
tion display depending on the
position and distance to the
object.Front corner sensor detection
Front center sensor detec-
tion
*1
Rear corner sensor detec-
tion
*2
Rear center sensor detec-
tion
*2
*1: Displayed when the shift lever is in a driving position
*2: Displayed when the shift lever is in R
■Display (audio system
screen)
When the sensors detect an
object, such as a wall, a graphic
is shown on the navigation sys-
tem (if equipped) or multimedia
system (if equipped) screen
depending on the position and
distance to the object.
 When the Toyota parking
assist monitor (if equipped) is
displayed
A simplified image is displayed on
the upper corner of the screen
when an obstacle is detected.
 When the panoramic view
monitor (if equipped) is dis-
played
Panoramic view*
A graphic is shown when the
panoramic view monitor is dis-
played.
*: A simplified image is displayed on
the upper corner of the screen
when an obstacle is detected
while magnified display is shown.
A
B
C
D

3104-5. Using the driving support systems
Except panoramic view
A simplified image is displayed
on the upper corner of the
screen when an obstacle is
detected.
The Intuitive parking assist can
be enabled/disabled on the
screen of the multi-information
display. ( P.112)
When the intuitive parking assist
function is disabled, the intuitive
parking assist OFF indicator
(  P.95) illuminates on the multi-
information display.
To re-enable the system, select
on the multi-inform ation display,
select and turn it on.
If the system is disabled, it will
remain off even if the power switch
is turned to ON after the power
switch has been turned off.
Turning intuitive parking
assist on/off
WARNING
■Intuitive parking assist pre-
cautions
Observe the following precau-
tions.
Failing to do so may result in the
vehicle being unable to be driven
safely and possibly cause an acci-
dent.
●Do not use the sensor at
speeds in excess of approxi-
mately 6 mph (10 km/h).
●The sensors’ detection areas
and reaction times are limited.
When moving forward or revers-
ing, check the areas surround-
ing the vehicle (especially the
sides of the vehicle) for safety,
and drive slowly, using the
brake to control the vehicle’s
speed.
●Do not install accessories near
the bumpers as those areas are
within the sensors’ detection
areas.
●The area directly under the
bumpers is not detected.
Thin posts or objects lower than
the sensor may not be detected
when approached, even if they
have been detected once.
■When to disable the function
In the following situations, disable
the function as it may operate
even though there is no possibility
of a collision.
●The vehicle is equipped with a
commercial fender pole, wire-
less antenna or fog lights.
●The front or rear bumper or a
sensor receives a strong
impact.
●A non-genuine Toyota suspen-
sion (lowered suspension, etc.)
is installed.