2021 TOYOTA SIENNA HYBRID sensor

4737-2. Steps to take in an emergency
7
When trouble arises
■Seat belt reminder light (warning buzzer*)
*: Driver’s seat belt warning buzzer:
The driver’s seat belt warning buzzer sounds to alert the drive r that his or
her seat belt is not fastened. Onc e the power switch is turned to ON, the
buzzer sounds. If the seat belt is still unfastened, the buzzer sounds inter-
mittently for a certain period o f time after the vehicle reaches a certain
speed.
Front passenger’s seat belt warning buzzer:
The front passenger’s seat belt warning buzzer sounds to alert the front
passenger that his or her seat belt is not fastened. If the sea t belt is
unfastened, the buzzer sounds int ermittently for a certain period of time
after the vehicle reaches a certain speed.
■Rear passengers’ seat belt reminder light (warning buzzer*)
*: Rear passengers’ seat belt warning buzzer:
The rear passengers’ seat belt warning buzzer sounds to alert t he rear
passengers that his or her seat belt is not fastened. If the se at belt is
unfastened, the buzzer sounds int ermittently for a certain period of time,
after the seat belt is fastened and unfastened and the vehicle reaches a
certain speed.
■Warning buzzer
In some cases, the buzzer may not
be heard because of noisy place or
an audio sound.■Front passenger detection sen-
sor, seat belt reminder and
warning buzzer
●If luggage is placed on the front
passenger seat, the front passen-
ger detection sensor may cause
the warning light to flash and the
warning buzzer to sound even if a
passenger is not sitting in the
Warning lightDetails/Actions
Warns the driver and/or front passenger to fasten their
seat belts
 Fasten the seat belt.
If the front passenger’s seat is occupied, the
front passenger’s seat belt also needs to be fas-
tened to make the warning light (warning
buzzer) turn off.
Warning lightDetails/Actions
Warns the rear passengers to fasten their seat belts
 Fasten the seat belt.

4747-2. Steps to take in an emergency
seat.
●If a cushion is placed on the seat,
the sensor may not detect a pas-
senger, and the warning light may
not operate properly.
■SRS warning light
This warning light system monitors
the airbag sensor assembly, front
impact sensors, side impact sensors
(front door), side impact sensors
(front), side impact sensors (rear),
driver’s seat position sensor,
driver’s seat belt buckle switch, front
passenger occupant classification
sensors, “AIR BAG ON” indicator
light, “AIR BAG OFF” indicator light,
front passenger’s seat belt buckle
switch, seat belt pretensioners and
force limiters, airbags, interconnect-
ing wiring and power sources.
(  P.42)
■If the malfunction indicator
lamp comes on while driving
First check the following:
●Is the fuel t ank empty?
If it is, fill the fuel tank immediately.
●Is the fuel tank cap loose?
If it is, tighten it securely.
The light will go o ff after several
driving trips.
If the light does not go off even after
several trips, contact your Toyota
dealer as soon as possible.
■Electric power steering system
warning light (warning buzzer)
When the 12-volt battery charge
becomes insufficien t or the voltage
temporarily drops, the electric power
steering system warning light may
come on and the warning buzzer
may sound.
■When the tire pressure warning
light comes on
Inspect the tires to check if a tire is
punctured.
If a tire is punctured: P.491 If none of the tires are punctured:
Turn the power switch to OFF then
turn it to ON.
Check if the tire pressure warning
light comes on or blinks.
If the tire pressur
e warning light
blinks for approximately 1 minute
then stays on
There may be a malfunction in the
tire pressure warning system. Have
the vehicle inspected by your
Toyota dealer immediately.
If the tire pressur e warning light
comes on
1 After the temperature of the tires
has lowered sufficiently, check
the inflation pressure of each tire
and adjust them to the specified
level.
2 If the warning light does not turn
off even after several minutes
have elapsed, check that the
inflation pressure of each tire is
at the specified level and perform
initialization. ( P.430)
■The tire pressure warning light
may come on due to natural
causes
The tire pressure warning light may
come on due to natural causes such
as natural air leaks and tire inflation
pressure changes caused by tem-
perature. In this ca se, adjusting the
tire inflation pressure will turn off the
warning ligh t (after a few minutes).
■When a tire is replaced with a
compact spare tire (vehicles
with compact spare tire)
The compact spare tire is not
equipped with a tire pressure warn-
ing valve and tran smitter. If a tire
goes flat, the tire pressure warning
light will not turn off even though the
flat tire has been replaced with the
spare tire. Replac e the spare tire
with the standard tire and adjust the
tire inflation pressure. The tire pres-
sure warning light will go off after a
few minutes.

5468-2. Customization
*: If equipped
■Power back door*1 ( P.153)
*1: If equipped
The delay before a power
sliding door operation starts
after pressing the switch on
the outside door handle
0.15 seconds
0.3 seconds
––O0.8 seconds
Off
Left Hands Free Power Slid-
ing Doors (kick sensor)
*OnOff–OO
Right Hands Free Power
Sliding Doors (kick sensor)
*OnOff–OO
Kick sensor detection sensi-
tivity
*21––O3
FunctionDefault settingCustomized
setting
Power back door operationsOnOff–O–
Back door opener switch
operationsPress and holdOne short press––O
switch of the wireless
remote control operationPress and hold
Press twice
––OOne short press
Off
Operation buzzer volume31–O–2
Opening angle5
1 to 4
–O–
User setting*2
Power back door open oper-
ation when the back door
opener switch is pressed
OnOff––O
Hands Free Power Back
Door (kick sensor)
*1, 3OnOff–OO
FunctionDefault settingCustomized settingABC
ABC

5478-2. Customization
8
Vehicle specifications
*2: The open position is set by the power back door switch on the back door.
(  P.163)
*3: When the towing hitch is installed, kick sensor does not work.
■Driving position memory* ( P.178)
*: If equipped
■Outside rear view mirrors ( P.198)
*: If equipped
■Power windows and moon roof* ( P.201, 204)
FunctionDefault settingCustomized
setting
Selection the door linking
driving position memory with
door unlock operation
Driver’s doorAll doors––O
Driver’s seat slide move-
ment when exiting the vehi-
cle
*Full
Off
O–OPartial
Steering wheel movement*Tilt only
Off
O–O
Telescopic only
Tilt and tele-scopic
FunctionDefault settingCustomized setting
Automatic mirror folding and
extending operation
*
Linked to the
locking/unlock- ing of the doorsOff
––OLinked to oper- ation of the
power switch
FunctionDefault settingCustomized setting
Mechanical key linked opera-
tionOffOn––O
ABC
ABC
ABC

5488-2. Customization
*: If equipped
■Lights (P.248)
*: Except for Canada
■Automatic light control system ( P.248)
*: If equipped
■Rear window wiper ( P.257)
Wireless remote control
linked operation (open)OffOn––O
Wireless remote control
linked operation signal
(buzzer)
OnOff––O
FunctionDefault settingCustomized
setting
Daytime Running LightsOnOff*O–O
Light off reminder buzzerOnOff––O
FunctionDefault settingCustomized setting
Light sensor sensitivityStandard–2 to 2O–O
Time elapsed before head-
lights automatically turn off
after doors are closed
30 seconds
Off
O–O60 seconds
90 seconds
Windshield wiper linked
headlight illumination
*OnOff––O
FunctionDefault settingCustomized setting
Back door opening linked
rear window wiper stop func-
tion
OffOn––O
Washer linked rear window
wiper operationOnOff––O
FunctionDefault settingCustomized settingABC
ABC
ABC
ABC

569What to do if... (Troubleshooting)
weak or depleted?
In this case, the hybrid sys-
tem can be started in a tem-
porary way. (P.505)
 Is the 12-volt battery dis-
charged? ( P.506)
 Is the power switch in ON?
If you cannot release the shift
lever by depressing the brake
pedal with the power switch in
ON ( P.240)
 It is locked automatically to
prevent theft of the vehicle.
( P.232)
 Is the window lock switch
pressed?
The power window except for
the one at the driver’s seat
cannot be operated if the win-
dow lock switch is pressed.
( P.203)
 The auto power off function
will be operated if the vehicle is left in ACC or ON (the
hybrid system is not operat-
ing) for a period of time.
(
P.235)
 The seat belt reminder light is
flashing
Are the driver and the passengers
wearing the seat belts? (
P.473)
The parking brake indicator is
on
Is the parking br ake released?
( 
P.243)
Depending on the situation,
other types of warning buzzer
may also sound. ( P.466, 477)
 Did anyone inside the vehicle
open a door during setting the
alarm?
The sensor detects it and the
alarm sounds. ( P.89)
To stop the alarm, turn the power
switch to ON or start the hybrid sys-
tem.
 Is the message displayed on
the multi-information display?
Check the message on the
The shift lever cannot be
shifted from P even if you
depress the brake pedal
The steering wheel can-
not be turned after the
hybrid system is stopped
The windows do not open
or close by operating the
power window switches
The power switch is
turned off automatically
A warning buzzer sounds
during driving
An alarm is activated and
the horn sounds (if
equipped)
A warning buzzer sounds
when leaving the vehicle

572Alphabetical Index
........................................... 155
Power back door .................. 153
Wireless remote control ....... 153
Back-up lights Replacing light bulbs ............ 451
Wattage ................................ 526
Battery (12-volt battery) ......... 422 If the 12-volt battery is dis-charged .............................. 506
Preparing and c hecking before
winter.................................. 343
Replacing ............................. 508
Warning light ........................ 466
Battery (traction battery) ......... 83
Blind Spot Monitor (BSM) ...... 299 Blind Spot Monitor function .. 302
Rear Cross Traffic Alert function........................................... 305
Bottle holders ......................... 369
Brake Brake Hold ........................... 246
Fluid ............................. 420, 524
Parking brake ....................... 243
Regenerative braking ............. 80
Warning light ........................ 466
Brake assist ............................ 335
Brake Hold .............................. 246
Break-in tips ........ ................... 209
Brightness control Instrument panel light control .......................... 99, 103
BSM (Blind Spot Monitor) ...... 299 Blind Spot Monitor function .. 302
Rear Cross Traffic Alert function........................................... 305
C
Care Aluminum wheels ................. 400
Exterior ................................. 400
Interior .................................. 403
Seat belts ............................. 403 Cargo capacity ................215, 218
Cargo hooks............................372
Chains......................................345
Child-protectors......................142
Child restraint system ..............58
Fixed with a LATCH system ...68
Fixed with a seat belt..............63
Front passenger occupant clas-sification system ...................51
Points to remember ................58
Riding with children ................57
Types of child restraint system installation method ...............60
Using an anchor bracket ........71
Child safety ...............................57 12-volt battery precautions .................422, 509
Airbag precautions .................46
Back door precautions..........150
Child restraint system .............60
Heated steering wheel and seat heater precautio ns..............361
How your child should wear the seat belt ................................36
Moon roof precautions..........205
Power window lock switch ....203
Power window precautions...202
Removed key battery precau- tions ....................................448
Seat belt extender precautions .............................................36
Seat belt precautions..............35
Seat heater precautions .......361
Cleaning ..........................400, 403 Aluminum wheels .................400
Exterior .................................400
Hybrid battery (tr action battery)
air intake vents and filters...443
Interior ..................................403
Radar sensor ........................263
Seat belts .............................403
Clock ................................100, 104

578Alphabetical Index
MeterClock ............................ 100, 104
Indicators................................ 95
Instrument panel light control .......................... 99, 103
Meter control switches ......... 105
Meters ............................ 97, 101
Multi-information display ...... 104
Settings ........................ 112, 541
Units ............................. 115, 541
Warning lights ................ 93, 466
Warning messages .............. 477
Meter control switches .......... 105
Mirrors Digital Rear-view Mirror........ 188
Inside rear view mirror.......... 186
Outside rear view mirror defog-gers .................................... 350
Outside rear view mirrors ..... 198
Vanity mirrors ....................... 374
Moon roof Door lock linked moon roof oper-ation ................................... 204
Jam protection function ........ 204
Operation ............................. 204
Warning message ................ 205
Multi-information display Audio system-linked display . 111
Changing the display............ 105
Display contents ................... 104
Driving information display ... 106
Driving support system informa-tion display ......................... 110
Dynamic radar cruise control with full-speed range .......... 288
Energy monitor ..................... 122
Hybrid System In dicator . 98, 102
Intuitive parking assist-sensor ........................................... 308
Language ..................... 115, 541
LTA (Lane Tracing Assist).... 281
Menu icons ........................... 106 Meter control switches..........105
PCS (Pre-Collisio
n System) .267
Pop-up display......................115
Settings ........................112, 541
Suggestion function ......117, 541
Tire pressure ...... ..................427
Units .............................115, 541
Vehicle information display...111
Warning messages ...............477
N
Navigation system-linked display
...............................................118
Noise from under ve hicle...........6
Normal mode...........................333
O
Odometer...........................97, 101
Odometer and trip meter display “ODO TRIP” switch .........99, 103
“ODO TRIP”switch ...........99, 103
Oil Engine oil..............................521
Opener Back door .....................152, 154
Hood .....................................413
Outer foot lights Replacing light bulbs ............451
Outside rear view mirrors ......198 Adjusting and folding ............198
BSM (Blind Spot M onitor) .....300
Linked mirror function when reversing.............................199
Outside rear view mirror defog- gers ....................................350
Outside temperature display .............................98, 102
Overheating.............................511