2021 TOYOTA SIENNA HYBRID transmission

2304-1. Before driving
Dinghy towing
Your vehicle is not designed
to be dinghy towed (with 4
wheels on the ground)
behind a motor home.
NOTICE
■To avoid serious damage to
your vehicle
Do not tow your vehicle with 4
wheels on the ground.
■To prevent causing serious
damage to the transmission
and AWD system.
2WD models: Never tow this vehi-
cle from the rear with the front
wheels on the ground. This may
cause serious damage to the
transmission.
AWD models: Never tow this vehi-
cle with any of t he wheels on the
ground. This may cause serious
damage to the transmission and
AWD system.

2384-2. Driving procedures
battery charge is low, vehicle speed
is higher than the EV drive mode
operating speed range or accelera-
tor pedal is depressed too much)
may be displayed. Use the EV drive
mode when it becomes available.
■If “EV Mode Deactivated” is
shown on the multi-information
display
The EV drive mode has been auto-
matically canceled. The reason the
EV drive mode is not available (the
battery charge is low, vehicle speed
is higher than the EV drive mode
operating speed range or accelera-
tor pedal is depressed too much)
may be displayed. Drive the vehicle
for a while before attempting to turn
on the EV drive mode again.
*1: To improve fuel efficiency and reduce noise, shift the shift lever
to D for normal driving.
*2: By selecting shift ranges using S mode, you can control accelerat-
ing force and engine braking
force.
■When driving with dynamic
radar cruise control with full-
speed range activated
Even when perform ing the following
actions with the intent of enabling
engine braking, engine braking will
not activate because dynamic radar
cruise control with full-speed range
will not be canceled.
●While driving in S mode, down-
shifting to 5 or 4. ( P.241)
●When switching th e driving mode
to sport mode while driving in D
position. ( P.333)
WARNING
■Caution while driving
When driving in EV drive mode,
pay special attention to the area
around the vehicle. Because
there is no engine noise, pedestri-
ans, people riding bicycles or
other people and vehicles in the
area may not be aware of the
vehicle starting off or approaching
them, so take extra care while
driving. Therefore, take extra care
while driving even if the Acoustic
Vehicle Alerting System is active.
Hybrid transmission
Select the shift position
depending on your purpose
and situation.
Shift position purpose
and functions
Shift
positionObjective or function
P
Parking the vehi-
cle/starting the hybrid system
RReversing
NNeutral
DNormal driving*1
SS mode driving*2

2414-2. Driving procedures
4
Driving
lever to the S position. The shift
ranges can be selected by oper-
ating the shift lever. Changing
the shift range allows restriction
of upper limit of the gears to be
used, preventing unnecessary
upshifting and enabling the level
of engine braking force to be
selected.
1Upshifting
2 Downshifting
The selected shift range, from S1 to
S6, will be displayed on the multi-
information display.
The initial shift range in S mode
is set automatically to S4 or S5
according to vehicle speed.
■S mode
●You can choose from 6 levels of
accelerating force and engine
braking force.
●A lower shift range will provide
greater accelerating force and
engine braking force than a higher
shift range, and t he engine revolu-
tions will also increase.
●To prevent the e ngine from over-
revving, upshifti ng may automati-
cally occur when the shift range is
4 or lower.
●When the shift range is 4 or lower,
holding the shift lever toward “+”
sets the shift range to 6.
■Downshifting restriction warn-
ing buzzer
To help ensure safety and driving
performance, dow nshifting opera-
tion may sometimes be restricted. In
some circumstances, downshifting
may not be possible even when the
shift lever is opera ted. (A buzzer will
sound twice.)
■If the “S” indi cator does not
come on or the “D” indicator is
displayed even after shifting the
shift lever to S
This may indicate a malfunction in
the transmission system. Have the
vehicle inspected by your Toyota
dealer immediately. (In this situa-
tion, the transmission will operate in
the same manner as when the shift
lever is in D.)

4637-2. Steps to take in an emergency
7
When trouble arises
The following may indicate a
problem with your transmission.
Contact your Toyota dealer or
commercial towing service
before towing. 
The hybrid system warning
message is shown on the
multi-information display and
the vehicle does not move.
 The vehicle makes an abnor-
mal sound.
From the front (2WD models)
Release the parking brake.
Turn automatic mode off.
( P.244)
From the front (AWD models)
Use a towing dolly under the
rear wheels.
NOTICE
■To prevent damage to the
vehicle when towing using a
wheel-lift type truck
●Do not tow the vehicle from the
rear when the power switch is
off. The steering lock mecha-
nism is not strong enough to
hold the front wheels straight.
●When raising the vehicle,
ensure adequate ground clear-
ance for towing at the opposite
end of the raised vehicle. With-
out adequate clearance, the
vehicle could be damaged while
being towed.
■To prevent damage to the
vehicle when towing with a
sling-type truck
Do not tow with a sling-type truck,
either from the front or rear.
■Recreational towing (behind
motor home, etc.)
Never dinghy tow your vehicle to
prevent causing serious damage
to the AWD system and transmis-
sion. ( P.230)
Situations when it is nec-
essary to contact dealers
before towing
Towing with a wheel-lift
type truck

5238-1. Specifications
8
Vehicle specifications
*: The fluid capacity is the quantity of reference.If replacement is necessary, contact y our Toyota dealer.
*: The fluid capacity is the quantity of reference.
If replacement is necessary, contact y our Toyota dealer.
NOTICE
■Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the spark pl ug gap.
Electrical system (12-volt Battery)
Open voltage at 68°F (20°C):
12.0 V or higher
(Turn the power switch to OFF and turn on
the high beam headlights for 30 seconds.)
If the voltage is lower than the standard
value, charge the battery.
Charging rates5 A max.
Hybrid transmission
Fluid capacity*4.6 qt. (4.4 L, 3.9 Imp.qt.)
Fluid typeToyota Genuine ATF WS
NOTICE
■Hybrid transmission fluid type
Using transmission fluid other than the above type may cause ab normal
noise or vibration, or ultimately damage the transmission of yo ur vehicle.
Rear differential (rear electric motor) (AWD models)
Fluid capacity*1.8 qt. (1.7 L, 1.5 Imp.qt.)
Fluid typeToyota Genuine ATF WS
NOTICE
■Transmission fluid type
Using transmission fluid other than the above type may cause ab normal
noise or vibration, or ultimately damage the transmission of yo ur vehicle.

Alphabetical Index575
F
Flat tire ............................ 481, 491Tire pressure warning system........................................... 427
Floor mats ................................. 32
Fluid Brake ............................ 420, 524
Hybrid transmission.............. 523
Rear differential .................... 523
Washer ................................. 421
Fog lights Replacing light bulbs ............ 451
Switch................................... 254
Footwell lights ..... ................... 363
Front door courtesy lights Wattage ................................ 526
Front doors .......... ................... 132
Front passenger’s seat belt reminder light ....................... 473
Front passenger occupant clas- sification system .................... 51
Front seat heaters .................. 361
Front seats .............................. 169 Adjustment ........................... 169
Cleaning ............................... 403
Correct driving posture ........... 33
Driving position memory....... 178
Head restraints ..................... 182
Memory recall function ......... 180
Power easy access system .. 178
Seat heaters ......................... 361
Seat position memory .......... 178
Seat ventilators .................... 361
Front side marker lights ........ 248 Light switch .......................... 248
Replacing light bulbs ............ 451
Front turn signal lights Replacing light bulbs ............ 451
Turn signal lever................... 242
Fuel Capacity ............................... 520 Fuel gauge .....................97, 101
Information .........
..................528
Refueling ..............................259
Type .............................520, 528
Warning light ........................472
Fuel consumption information Average fuel consumption ....125
Current fuel consumption .....125
Fuel filler door.........................260 If the fuel filler door cannot be opened ...............................503
Refueling ..............................259
Fuel gauge.........................97, 101
Fuses .......................................449
G
Garage door opene r ...............392
Gauges ..............................97, 101
Glove box ................................367
Grocery bag hooks .................387
H
Headlights ...............................248 Automatic High Beam system...........................................250
Light switch...........................248
Replacing light bulbs ............451
Wattage ................................526
Head restraints .......................182
Head-up display ......................118 Driving information display area...........................................118
Driving support system display area ....................................120
Head-up display switch ........119
Hybrid System Indicator .......121
Navigation system-linked display ...........................................118
Pop-up display......................120
Settings ................................119
Head-up display switch..........119

Alphabetical Index583
Snow tires ............................ 343
Spare tire.............................. 491
Tire identification number ..... 531
Tire inflation pressure display function............................... 427
Tire pressure warning system ........................................... 427
Uniform Tire Quality Grading 533
Warning light ........................ 472
Tools .............. .................. 483, 492
Top tether strap ... ..................... 71
Total load capacity ......... 215, 218
Towing Dinghy towing....................... 230
Towing eyelet ............... 483, 492
Trailer sway control .............. 335
Trailer towing................ 219, 220
Toyota Safety Sense .............. 262 Automatic High Beam .......... 250
Dynamic radar cruise control with full-speed range .......... 288
LTA (Lane Tracing Assist).... 275
PCS (Pre-Collision System) . 267
RSA (Road Sign Assist) ....... 285
TRAC (Traction Control) ........ 335
Traction battery (Hybrid battery) ................................................. 83Hybrid battery (traction battery) air intake vents ..................... 85
Location.................................. 83
Specification ......................... 520
Warning messages ................ 86
Traction Control (TRAC) ........ 335
Traction motor (e lectric motor)79
Trailer sway control ............... 335
Trailer towing .................. 219, 220
Transmission Driving mode select switch... 333
Hybrid transmission.............. 238
Trip meters ....... ................. 97, 101
Turn signal lights Replacing light bulbs ............ 451 Turn signal lever .
..................242
U
USB charging ports ................379
V
Vacuum cleaner ......................389
Vanity lights
Vanity lights ..........................374
Wattage ................................526
Vanity mirrors .........................374
Vehicle data recordings .............7
Vehicle identification number519
Vehicle Stability Control (VSC) ...............................................335
Ventilators (seat ventilators) .361
VSC (Vehicle Stab ility Control)
...............................................335
W
Warning buzzers Approach warning ................295
Brake hold ............................471
Brake Override System ........471
Brake system ........................466
Downshifting .........................241
Drive-Start Control ................471
Electric power steering .........468
High coolant temperature .....467
Hybrid system overheat ........467
Intuitive parking assist OFF indi- cator ...................................469
Intuitive parking assist ..........308
Low engine oil pressure .......467
LTA (Lane Traci ng Assist) ....275
LTA indicator ........................469
Open door ............................136
Open hood............................136
Open window........................202
PKSB OFF indicator .............470