TOYOTA SIENNA HYBRID 2021 Owners Manual (in English)

2204-1. Before driving
■Before towing
Check that the fo llowing conditions
are met:
●Ensure that your vehicle’s tires
are properly inflated. ( P.525)
●Trailer tires are inflated according
to the trailer manufacturer’s rec-
ommendation.
●All trailer lights work as required
by law.
●All lights work each time you con-
nect them.
●The trailer ball is set at the proper
height for the coupler on the
trailer.
●The trailer is level when it is
hitched.
Do not drive if th e trailer is not
level, and check for improper
tongue weight, overloading, worn
suspension, or other possible
causes.
●The trailer cargo is securely
loaded.
●The rear view mirr ors conform to
all applicable fede ral, state/provin-
cial or local regulations. If they do
not, install rear view mirrors
appropriate for towing purposes.
Trailer towing (with
towing package)
Your vehicle is designed
primarily as a passenger-
and-load-carrying vehicle.
Towing a trailer can have an
adverse impact on handling,
performance, braking, dura-
bility, and fuel consump-
tion. For your safety and the
safety of others, you must
not overload your vehicle or
trailer. You must also
ensure that you are using
appropriate towing equip-
ment, that the towing equip-
ment has been installed
correctly and used properly,
and that you employ the
requisite driving habits.
Vehicle-trailer stability and
braking performance are
affected by trailer stability,
brake performance and set-
ting, trailer brakes, the hitch
and hitch systems (if
equipped).
To tow a trailer safely, use
extreme care and drive the
vehicle in accordance with
your trailer’s characteris-
tics and operating condi-
tions.
Toyota warranties do not
apply to damage or mal-
function caused by towing a
trailer for commercial pur-
poses.
Contact your Toyota dealer for
further information about addi-
tional requirements such as a
towing kit, etc.

2214-1. Before driving
4
Driving
WARNING
■Trailer towing precautions
To tow a traile r safely, use
extreme care and drive the vehi-
cle in accordance with the trailer’s
characteristics and operating con-
ditions. Failure to do so could
cause an accident resulting in
death or serious injury. Vehicle
stability and braking performance
are affected by trailer stability,
brake setting and performance,
and the hitch. Your vehicle will
handle differently when towing a
trailer.
■To avoid accident or injury
●Do not exceed the TWR,
unbraked TWR, GCWR, GVWR
or GAWR.
●Vehicles without spare tire: Do
not tow a trailer when the tire
installed is re paired with the
emergency tire puncture repair
kit.
●If the gross trailer weight is over
2000 lb. (907 kg), a sway con-
trol device with sufficient capac-
ity is required.
●Adjust the tongue weight within
the appropriate range. Place
heavier loads as close to the
trailer axle as possible.
●Do not exceed 65 mph (104
km/h), the posted towing speed
limit or the speed limit for your
trailer as set fort h in your trailer
owner’s manual, whichever is
lowest. Slow down sufficiently
before making a turn, in cross
winds, on wet or slippery sur-
face, etc. to help avoid an acci-
dent. If you experience a
vehicle-trailer instability from
reducing a certain speed, slow
down and make sure you keep
your vehicle speed under the
speed of which you experience
the instability.
●Do not make jer ky, abrupt or
sharp turns.
●Do not apply the brakes sud-
denly as you may skid, resulting
in jackknifing and loss of vehicle
control. This is especially true
on wet or slippery surfaces.
●Do not exceed the trailer hitch
assembly weight, gross vehicle
weight, gross axle weight and
trailer tongue w eight capacities.
●Do not use dynamic radar
cruise control with full-speed
range when towing.
●Slow down and downshift
before descending steep or long
downhill grades. Do not make
sudden downshifts while
descending steep or long down-
hill grades.
●Vehicle-trailer in stability is more
likely on steep long downhills.
Before descending steep or
long downhill grades, slow
down and downshift. Do not
make sudden downshifts when
descending steep or long down-
hill grades. Avoid holding the
brake pedal down too long or
applying the brakes too fre-
quently. This could cause the
brakes to overheat and result in
reduced braking efficiency.
●Vehicles with compact spare
tire: Do not tow a trailer when
the compact spare tire is
installed on your vehicle.
■When towing a trailer
Toyota recommends trailers with
brakes that conform to any appli-
cable federal and s tate/provincial
regulations.

2224-1. Before driving
■GCWR (Gross Combination
Weight Rating)
The maximum allowable gross
combination weight. The gross
combination weight is the sum
of the total vehicle weight
(including the occupants, cargo
and any optional equipment
installed on the vehicle) and the
weight of the trailer being towed
(including the cargo in the
trailer).
■GVWR (Gross Vehicle
Weight Rating)
The maximum allowable gross
vehicle weight. The gross vehi-
cle weight is the total weight of
the vehicle. When towing a
trailer, it is the sum of the vehi-
cle weight (including the occu-
pants, cargo and any optional
equipment installed on the vehi-
cle) and the tongue weight.
■GAWR (Gross Axle Weight
Rating)
The maximum allowable gross
axle weight. The gross axle
weight is the load placed on
each axle (front and rear).
Front GAWR
WARNING
●If the gross trailer weight
exceeds unbraked TWR, trailer
brakes are required. Toyota rec-
ommends trailers with brakes
that conform to all applicable
federal and state/provincial reg-
ulations.
●Never tap into y our vehicle’s
hydraulic system, as this will
lower the vehicle’s braking
effectiveness.
●Never tow a trailer without using
a safety chain securely attached
to both the traile r and the vehi-
cle. If damage occurs to the
coupling unit or hitch ball, there
is danger of the trailer wander-
ing into another lane.
Towing related terms
A

2234-1. Before driving
4
Driving
Rear GAWR
■TWR (Trailer Weight Rating)
The maximum allowable gross
trailer weight. The gross trailer
weight is the sum of the trailer
weight and the weight of the
cargo in the trailer.
TWR is calculated assuming
base vehicle with one driver,
one front passenger, hitch and
hitch systems (if required).
Additional optional equipment, pas-
sengers and cargo in the vehicle
will reduce the tra iler weight rating
so as not to exceed GCWR, GVWR
and GAWR.
If the gross traile r weight exceeds
3000 lb. (1360 kg), it is recom-
mended to use a trailer with 2 or
more axles.
(With brakes)
■Unbraked TWR (Unbraked
Trailer Weight Rating)
The trailer weight rating for tow-
ing a trailer without a trailer ser-
vice brake system. (Without brakes)
■Tongue Weight
The load placed on the trailer
hitch ball. ( P.224)
 The gross trailer weight must
never exceed 3500 lb. (1585
kg)
*.
*: The towing package is required.
Toyota does not recommend tow-
ing with this vehicle without the tow-
ing package.
 The gross combination weight
must never exceed the
GCWR described below:
2WD models
8818 lb. (4000 kg)
*

AWD models
8995 lb. (4080 kg)
*
B
A
Weight limits
A

2244-1. Before driving
*: The towing package is required.
Toyota does no t recommend tow-
ing with this vehicle without the tow-
ing package.
 The gross vehicle weight
must never exceed the
GVWR indicated on the Certi-
fication Label.
 The gross axle weight on
each axle must never exceed
the GAWR indicated on the
Certification Label.
 If the gross trailer weight is
over the unbraked TWR,
trailer service brakes are
required.
 If the gross trailer weight is
over 2000 lbs. (907 kg), a
sway control device with suffi-
cient capacity is required.
Confirm that the gross trailer
weight, gross combination
weight, gross vehicle weight,
gross axle weight and tongue
weight are all within the limits.
■GCWR*
2WD models
8818 lb. (4000 kg)
AWD models
8995 lb. (4080 kg)
*: This model meets the tow-vehicle trailering requirement of SAE
International per SAE J2807.
The towing package is required.
Toyota does not recommend tow-
ing with this vehicle without the tow-
ing package.
■TWR*
3500 lb. (1585 kg)
*: This model meets the tow-vehicle trailering requirement of SAE
International per SAE J2807.
The towing package is required.
Toyota does not recommend tow-
ing with this vehicle without the tow-
ing package.
■Unbraked TWR*
1000 lb. (450 kg)
*: This model meets the tow-vehicle trailering requirement of SAE
International per SAE J2807.
 A recommended tongue
weight varies in accordance
with the types of trailers or
towing as described below.
 To ensure the recommended
values shown below, the
trailer must be loaded by
referring to the following
GCWR, TWR and
Unbraked TWRTrailer Tongue Weight

2254-1. Before driving
4
Driving
instructions.
• Tongue Weight
The gross trailer weight should be
distributed so that the tongue
weight is 9% to 11%.
(Tongue weight /Gross trailer
weight x 100 = 9% to 11%)
Gross trailer weight
Tongue weight
The gross trailer weight, gross
axle weight and tongue weight
can be measured with platform
scales found at a highway
weighing station, building supply
company, trucking company,
junk yard, etc.
Trailer hitch assemblies have
different weight capacities.
Toyota recommends the use of
Toyota hitch/bracket for your
vehicle. For details, contact your
Toyota dealer.
 If you wish to install a trailer
hitch, contact your Toyota
dealer.
 Use only a hitch that con-
forms to the gross trailer weight requirement of your
vehicle.
 Follow the directions supplied
by the hitch manufacturer.
 Lubricate the hitch ball with a
light coating of grease.
 Remove the hitch ball when-
ever you are not towing a
trailer. Remove the trailer
hitch if you do not need it.
After removing the hitch, seal
any mounting holes in the
vehicle body to prevent entry
of any substances into the
vehicle.
Hitch (if equipped)
A
B
:$51,1*
■Hitch
Trailer hitch asse mblies have dif-
ferent weight capacities estab-
lished by the hitch manufacturer.
Even though the vehicle may be
physically capable of towing a
higher weight, the operator must
determine the maximum weight
rating of the particular hitch
assembly and never exceed the
maximum weight rating specified
for the trailer hitch. Exceeding the
maximum weight rating set by the
trailer hitch manufacturer can
cause an accident resulting in
death or serious personal injuries.
NOTICE
■When installing a trailer hitch
Use only the position recom-
mended by your Toyota dealer.
Do not install the trailer hitch on
the bumper; this may cause body
damage.

2264-1. Before driving
Weight carrying ball position:
48.8 in. (1238.8 mm)
Hitch receiver pin hole posi-
tion: 42.5 in. (1079.7 mm)
Use the correct trailer ball for
your application.
Trailer ball load rating
Matches or exceeds the gross
trailer weight rat ing of the trailer.
Ball diameter
Matches the size of the trailer cou-
pler. Most couplers are stamped
with the required tr ailer ball size.
Shank length
Protrudes beyond the bottom of the
lock washer and nut by at least 2
threads.
Shank diameter
Matches the ball mount hole diame-
ter size.
■Matching trailer ball height to
trailer coupler height
No matter wh ich class of tow hitch
applies, for a safe trailer hookup, the
trailer ball setup on must be proper
height for the coup ler on the trailer.
Coupler
Trailer ball
Please consult your dealer
when installing trailer lights, as
Positions for towing hitch
receiver
Selecting trailer ball
A
B
A
B
Trailer classTypical trailer ball size
II2 in.
I1 7/8 in.
Connecting trailer lights
C
D
A
B

2274-1. Before driving
4
Driving
incorrect installation may cause
damage to the vehicle’s lights.
Please take care to comply with
your state’s laws when installing
trailer lights.
Your vehicle will handle differ-
ently when towing a trailer. Help
to avoid an accident, death or
serious injury, keep the follow-
ing in mind when towing:
Speed limits for towing a
trailer vary by state or prov-
ince. Do not exceed the
posted towing speed limit.
 Toyota recommends that the
vehicle-trailer speed limit is 65
mph (104 km/h) on a flat,
straight, dry road. Do not
exceed this limit, the posted
towing speed limit or the
speed limit for your trailer as
set forth in your trailer owner’s
manual, whichever is lowest.
Instability of the towing vehi-
cle-trailer combination (trailer
sway) increases as speed
increases. Exceeding speed
limits may cause loss of con-
trol. 
Before starting out, check the
trailer lights, tires and the
vehicle-trailer connections.
Recheck after driving a short
distance.
 Practice turning, stopping and
reversing with the trailer
attached in an area away
from traffic until you become
accustomed to the feel of the
vehicle-trailer combination.
 Reversing with a trailer
attached is difficult and
requires practice. Grip the
bottom of the steering wheel
and move your hand to the
left to move the trailer to the
left. Move your hand to the
right to move the trailer to the
right. (This is generally oppo-
site to reversing without a
trailer attached.) Avoid sharp
or prolonged turning. Have
someone guide you when
reversing to reduce the risk of
an accident.
 As stopping distance is
increased when towing a
trailer, vehicle-to vehicle dis-
tance should be increased.
For each 10 mph (16 km/h) of
speed, allow at least one
vehicle and trailer length.
 Avoid sudden braking as you
may skid, resulting in the
trailer jackknifing and a loss of
vehicle control. This is espe-
cially true on wet or slippery
surfaces.
NOTICE
■Do not directly splice trailer
lights
Do not directly splice trailer lights.
Directly splicing trailer lights may
damage your vehicle’s electrical
system and cause a malfunction.
Trailer towing tips

2284-1. Before driving
Avoid jerky starts or sudden
acceleration.
 Avoid jerky steering and
sharp turns, and slow down
before making turn.
 Note that when making a turn,
the trailer wheels will be
closer than the vehicle wheels
to the inside of the turn. Com-
pensate by making a wider
than normal turning radius.
 Slow down before making a
turn, in cross winds, on wet or
slippery surfaces, etc.
Increasing vehicle speed can
destabilize the trailer.
Take care when passing other
vehicles. Passing requires
considerable distance. After
passing a vehicle, do not for-
get the length of your trailer,
and be sure you have plenty
of room before changing
lanes.
 To maintain engine braking
efficiency and charging sys-
tem performance, when using
engine braking, do not use
the transmission in D.
 Instability happens more fre-
quently when descending
steep or long downhill grades.
Before descending, slow
down and downshift. Do not
make sudden downshifts
while descending steep or
long downhill grades.
 Avoid holding the brake pedal down too long or applying the
brakes too frequently. This
could cause the brakes to
overheat and result in
reduced braking efficiency.
 Due to the added load of the
trailer, your vehicle’s hybrid
system may overheat on hot
days (at temperatures over
85°F [30°C]) when driving up
a long or steep grade. If the
engine coolant temperature
gauge indicates overheating,
immediately turn off the air
conditioning (if in use), pull
your vehicle off the road and
stop in a safe spot. ( P.511)
 Always place wheel blocks
under both the vehicle’s and
the trailer’s wheels when
parking. Apply the parking
brake firmly, and put the
transmission in P. Avoid park-
ing on a slope, but if unavoid-
able, do so only after
performing the following:
1 Apply the brakes and keep
them applied.
2 Have someone place wheel
blocks under both the vehi-
cle’s and trailer’s wheels.
3 When the wheel blocks are in
place, release the brakes
slowly until the blocks absorb
the load.
4 Apply the parking brake
firmly.

2294-1. Before driving
4
Driving
5Shift into P and turn off the
hybrid system.
 When restarting after parking
on a slope:
1 With the transmission in P,
start the hybrid system. Be
sure to keep the brake pedal
depressed.
2 Shift into a forward gear. If
reversing, shift into R.
3 If the parking brake is in man-
ual mode, release the park-
ing brake. ( P.243)
4 Release the brake pedal, and
slowly pull or back away from
the wheel blocks. Stop and
apply the brakes.
5 Have someone retrieve the
blocks.
■Break-in schedule
If your vehicle is new or equipped
with any new power train compo-
nents (such as an engine, transmis-
sion, differential or wheel bearing),
Toyota recommends that you do not
tow a trailer unt il the vehicle has
been driven for over 500 miles (800
km).
After the vehicle has been driven for
over 500 miles (800 km), you can
start towing. However, for the next
500 miles (800 km), drive the vehi-
cle at a speed of less than 45 mph
(72 km/h) when towing a trailer, and
avoid full throttle acceleration.
■Maintenance
●If you tow a traile r, your vehicle
will require more f requent mainte-
nance due to the additional load.
(See “Scheduled Maintenance
Guide” or “Owner’s Manual Sup-
plement”.)
●Retighten the fixing bolts of the
towing ball and bracket after
approximately 600 miles (1000
km) of tra iler towing.
■If trailer sway occurs
One or more factors (crosswinds,
passing vehicles, rough roads, etc.)
can adversely affect handling of
your vehicle and t railer, causing
instability.
●If trailer swaying occurs:
• Firmly grip the steering wheel. Steer straight ahead.
Do not try to contr ol trailer sway-
ing by turning the steering wheel.
• Begin releasing the accelerator pedal immediately but very gradu-
ally to reduce speed.
Do not increase speed. Do not
apply vehicle brakes.
If you make no extreme correction
with the steering or brakes, your
vehicle and trailer should stabilize (if
enabled, Trailer Sway Control can
also help to stabilize the vehicle and
trailer.).
●After the trailer swaying has
stopped:
• Stop in a safe place. Get all occu- pants out of the vehicle.
• Check the tires of the vehicle and the trailer.
• Check the load in the trailer.
Make sure the load has not
shifted.
Make sure the tongue weight is
appropriate, if possible.
• Check the load in the vehicle. Make sure the vehicle is not over-
loaded after occupants get in.
If you cannot find any problems, the
speed at which trailer swaying
occurred is beyond the limit of your
particular vehicle-trailer combina-
tion. Drive at a lower speed to pre-
vent instability. Remember that
swaying of the towing vehicle-trailer
increases as speed increases.