2021 TOYOTA SIENNA HYBRID air filter

4446-3. Do-it-yourself maintenance
If dust and clogs cannot be com-
pletely removed with the air
intake vent covers installed,
remove the covers and clean
the filters.
1Turn the power switch off.
2 Using a Phillips screwdriver,
remove the clip.
3 Remove the air intake vent
cover.
Pull the cover as shown in the illus-
tration to disengage the claws,
starting from the claw in the upper
right corner and pull the cover
toward the front of the vehicle to
remove it.
4 Remove the air intake vent
filter.
Disengage the 3 center claws from the filter.
5
Remove the dust and clogs
from the filter using a vacuum
cleaner, etc.
Make sure to also remove the dust
and clogs from the inside of the air
intake vent cover.
6 Reinstall the filter to the
cover.
Engage the 3 center claws to install
the filter.
Make sure that the filter is not
crooked or deformed when install-
ing it.
If dust and clogs cannot
be completely removed

4456-3. Do-it-yourself maintenance
6
Maintenance and care
7Install the air intake vent
cover.
Insert the tab of the cover as shown
in the illustrati on and push the
cover to engage the claws.
8 Using a Phillips screwdriver,
install the clip.
■Scheduled maintenance of the
air intake vents is necessary
when
In some situations such as when the
vehicle is used frequently or in
heavy traffic or dusty areas, the air
intake vents may need to be
cleaned more regularly. For details,
refer to “Scheduled Maintenance
Guide” or “Owner’s Manual Supple-
ment”.
■Cleaning the air intake vents
●Dust in the air in take vents may
interfere with the cooling of the
hybrid battery (traction battery). If
charging/discharging of the hybrid
battery (traction battery) becomes
limited, the distance that the vehi-
cle can be driven using the electric motor (traction motor) may be
reduced and the fuel economy
may be reduced. Inspect and
clean the air intake vents periodi-
cally.
●Improper handling of the air intake
vent covers and filters may result
in damage to them. If you have
any concerns about cleaning the
filters, contact your Toyota dealer.
■If “Maintenance Required for
Traction Battery Cooling Parts
See Owner’s Manual” is shown
on the multi-information display
●If this warning message is shown
on the multi-information display,
remove the air intake vent covers
and clean the filters. (
P.444)
●After cleaning the air intake vents,
start the hybrid system and check
that the warning message is no
longer shown.
It may take approximately 20 min-
utes after the hybrid system is
started until the warning message
disappears. If the warning mes-
sage does not disappear, have
the vehicle inspected by your
Toyota dealer.
WARNING
■When cleaning the air intake
vents
●Do not use water or other liq-
uids to clean the air intake
vents. If water is applied to the
hybrid battery (traction battery)
or other components, a mal-
function or fire may occur.
●Before cleaning the air intake
vents, make sure to turn the
power switch off to stop the
hybrid system.
■When removing the air intake
vent covers
Do not touch the service plug
located underneath the console
box. ( P.84)

4466-3. Do-it-yourself maintenance
NOTICE
■When cleaning the air intake
vents
When cleaning the air intake
vents, make sure to only use a
vacuum to suck out dust and
clogs. If a compressed air blow
gun, etc. is used to blow out dust
and clogs, the dust or clogs may
be pushed into the air intake
vents, which may affect the per-
formance of the hybrid battery
(traction battery) and cause a
malfunction.
■To prevent damage to the
vehicle
●Do not allow water or foreign
matter to enter t he air intake
vents when the covers are
removed.
●Carefully handle the removed
filter so that it will not be dam-
aged. If the filter is damaged,
have it replaced with a new filter
by your Toyota dealer.
●Make sure to reinstall the filters
and covers to their original posi-
tions after cleaning.
●Do not install anything to the air
intake vents other than the
exclusive filters for this vehicle
or use the vehicle without the fil-
ters installed.
■If “Maintenance Required for
Traction Battery Cooling
Parts See Owner’s Manual” is
shown on the multi-informa-
tion display
If the vehicle is continuously
driven with the warning message
(indicating that charging/discharg-
ing of the hybrid battery [traction
battery] may become limited) dis-
played, the hybrid battery (traction
battery) may malfunction. If the
warning message is displayed,
clean the air intake vents immedi-
ately.

4797-2. Steps to take in an emergency
7
When trouble arises
tion display, it may indicate a mal-
function. Immediately stop the
vehicle and contact your Toyota
dealer.
•“Braking Power Low”
• “12-Volt Battery Charging System
Malfunction”
• “Oil Pressure Low”
●If any of the following messages
are shown on the multi-informa-
tion display, the vehicle may have
run out of fuel. Stop the vehicle in
a safe place and, if the fuel level is
low, refuel the vehicle.
• “Hybrid System Stopped”
• “Engine Stopped”
●If “Low Auxiliary Battery See
Owner’s Manual” is shown
• When the display goes off after
several seconds
*:
Maintain the hybri d system opera-
tion for more than 15 minutes and
charge the 12- volt battery.
• When the display does not go off:
Start up the hybrid system using the
procedures for “If the 12-volt battery
is discharged” ( P.506)
*: Displays for about 6 seconds
●If “Maintenance Required for Trac-
tion Battery Cooling Parts See
Owner’s Manual” is shown, the fil-
ter may be clogged, the air intake
vent may be blocked, or there may
be a gap in the duct. Therefore,
perform the following correction
procedure.
• If the air intake vent or filter of the hybrid battery (traction battery)
are dirty, perform the procedures
on P.443to clean them.
• If the warning message is shown when the air intake vent and filter
of the hybrid battery (traction bat-
tery) are not dirty, have the vehicle
inspected at your Toyota dealer.
■If “Engine Oil Level Low Add or
Replace” is displayed
The engine oil level may be low.
Check the level of the engine oil, and add engine oil if necessary.
This message may be displayed if
the vehicle is stopped on a slope.
Move the vehicle to a level surface
and check if the message disap-
pears.
■If “Hybrid System Stopped
Steering Power Low” is dis-
played
This message is displayed if the
hybrid system is stopped while driv-
ing.
When steering wheel operations are
heavier than usual, grip the steering
wheel firmly and operate it using
more force than usual.
■If “Hybrid System Overheated
Output Power Reduced” is
shown
The message may be shown when
driving under severe operating con-
ditions. (For example, when driving
up a long steep hill or driving up a
steep hill in reverse.)
Coping method: P.514
■If “Traction Battery Needs to be
Protected Refrain from the Use
of N Position” is shown
This message may be displayed
when the shift lever is in N.
As the hybrid battery (traction bat-
tery) can not be charged when the
shift lever is in N, shift the shift lever
to P when the vehicle is stopped.
■If “Traction Battery Needs to be
Protected Shift into P to
Restart” is shown
This message is displayed when the
hybrid battery (traction battery)
charge has becom e extremely low
because the shift lever has been left
in N for a certain amount of time.
When operating the vehicle, shift to
P and restart the hybrid system.
■If “Shift to P Before Exiting
Vehicle” is shown
Message is displayed when the
driver’s door is opened without turn-

571Alphabetical Index
Alphabetical Index
A
A/C ................................... 348, 358Air conditioning filter ............. 441
Eco air conditioning mode .... 352
Front automatic air conditioning system ................................ 348
Front seat concentrated airflow mode (S-FLOW) ................. 354
Rear automatic air conditioning system ................................ 358
ABS (Anti-lock Brake System) ............................................... 335Function ............................... 335
Warning light ........................ 468
ACA (Active Cornering Assist) ............................................... 335
Acoustic Vehicle Alerting Sys- tem ........................................... 81
Active Cornering Assist (ACA) ............................................... 335
Airbags ...................................... 41 Airbag operating conditions.... 44
Airbag precautions for your child............................................. 46
Airbag warning light.............. 468
Correct driving posture ........... 33
Curtain shield airbag operating conditions ............................. 44
Curtain shield airbag precautions ............................................. 46
Front passenger occupant clas- sification system ................... 51
General airbag precautions .... 46
Locations of airbags ............... 41
Modification and disposal of air- bags ..................................... 49
Seat cushion airbag ............... 41
Side airbag operating conditions ............................................. 44
Side airbag precautions ......... 46
Side and curtain shield airbags operating conditions .............44
Side and curtain shield airbags precautions ...........................46
SRS airbags ...........................41
SRS warning light .................468
Air conditioning filter .............441
Air conditioning system.348, 358 Air conditioning filter .............441
Changing the rear seat settings...........................................356
Eco air conditioning mode ....352
Front automatic air conditioning system ................................348
Front seat concent rated airflow
mode (S-FLOW) .................354
Rear automatic air conditioning system ................................358
Alarm .........................................89 Alarm ......................................89
Warning buzzer .. ..................466
Anchor brackets ... ..............60, 71
Antenna (Smart key system) .164
Anti-lock brake system (ABS)335 Function................................335
Warning light ........................468
Approach warning ..................295
Armrest ......... ......................... ..386
Assist grips .............................386
Automatic air conditioning sys- tem .................................348, 358Air conditioning filter .............441
Eco air conditioning mode ....352
Automatic High Beam ............250
Automatic light control system ...............................................249
Average fuel consumption ....125
Average fuel economy ...........106
Average vehicle speed ...111, 125
B
Back door ................................150 Hands Free Power Back door

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

576Alphabetical Index
Heated steering wheel ........... 361
HeatersFront automatic air conditioning system ................................ 348
Heated steering wheel ......... 361
Outside rear view mirrors ..... 350
Rear automatic air conditioning system ................................ 358
Seat heaters ......................... 361
High mounted stoplight Replacing light bulbs ............ 451
Hill-start assist control .......... 335
Hood ........................................ 413
Hooks Cargo hooks ......................... 372
Coat hooks ........................... 388
Grocery bag hooks ............... 387
Retaining hooks (floor mat) .... 32
Horn ......................................... 186
Hybrid battery (tr action battery)
Location.................................. 83
Specification ......................... 521
Hybrid battery (traction battery) air intake vents ............... 85, 443
Hybrid battery (traction battery) air intake vents and filters ... 443
Hybrid battery air vent ............. 85
Hybrid system .......................... 79 ACC...................................... 234
Acoustic Vehicle Alerting System............................................. 81
Emergency shut off system .... 86
Energy monitor/consumption screen ................................ 122
EV drive mode...................... 236
High voltage components....... 83
How to start the hybrid system ........................................... 231
Hybrid battery (traction battery) air vents.............................. 443
Hybrid System In dicator . 97, 101
Hybrid system precautions ..... 83 Hybrid vehicle dri
ving tips .....341
If the hybrid sys tem will not start
...........................................501
If your vehicle has to be stopped in an emergency .................459
Ignition switch (power switch) ...........................................231
Overheating ..........................511
Power (ignition) switch .........231
Regenerative braking .............80
Starting the hybrid system ....231
Hybrid System Indicator ..................98, 102, 121
Hybrid transmissio n ...............238
S mode .................................241
I
I/M test .....................................410
Identification Engine ..................................520
Vehicle..................................519
Ignition switch (power switch) ...............................................231Auto power off fun ction.........235
Changing the power switch modes.................................234
If your vehicle has to be stopped in an emergency .................459
Starting the hybrid system ....231
Immobilizer system ..................88
Indicators ..................................95
Initialization Items to initialize ...................554
Oil maintenance ...................418
Tire pressure warning system...........................................430
Inside rear view m irror ...186, 188
Instrument panel light control .............................99, 103
Interior lights...........................363 Switch ...................................364
Wattage ................................526