2021 TOYOTA SIENNA HYBRID Owners Manual (in English)

4486-3. Do-it-yourself maintenance
minal facing up.
4When installing, reverse the
steps listed.
WARNING
■Battery precautions
Observe the following precau-
tions.
Failure to do so m ay result in
death or serious injury.
●Do not swallow the battery.
Doing so may cause chemical
burns.
●A coin battery or button battery
is used in the electronic key. If a
battery is swallowed, it may
cause severe chemical burns in
as little as 2 hours and may
result in death or serious injury.
●Keep away new and removed
batteries from children.
●If the cover cannot be firmly
closed, stop using the electronic
key and stow the key in the
place where children cannot
reach, and then contact your
Toyota dealer.
●If you accidentally swallow a
battery or put a b attery into a
part of your body, get emer-
gency medical attention imme-
diately.
■To prevent battery explosion
or leakage of flammable liq-
uid or gas
●Replace the battery with a new
battery of the same type. If a
wrong type of battery is used, it
may explode.
●Do not expose batteries to
extremely low pr essure due to
high altitude or extremely high
temperatures.
●Do not burn, bre ak or cut a bat-
tery.
NOTICE
■When replacing the battery
Use a flathead screwdriver of
appropriate size. Applying exces-
sive force may deform or damage
the cover.
■For normal operation after
replacing the battery
Observe the following precautions
to prevent accidents:
●Always work with dry hands.
Moisture may cause the battery
to rust.
●Do not touch or move any other
component inside the remote
control.
●Do not bend either of the battery
terminals.

4496-3. Do-it-yourself maintenance
6
Maintenance and care
1Turn the power switch off.
2 Open the fuse box cover.
Engine compartment
Push claw , and to com-
pletely release the lock, and then lift
up the cover.
Left side instrument panel
Remove the lid.
Right side luggage compart-
ment
Remove the cover
3Remove the fuse.
Only type A fuse c an be removed
using the pullout tool.
4 Check if the fuse is blown.
Replace the blown fuse with a new
fuse of an appropriate amperage
rating. The amperage rating can be
found on the fuse box lid.
Type A
Normal fuse
Checking and replac-
ing fuses
If any of the electrical com-
ponents do not operate, a
fuse may have blown. If this
happens, check and replace
the fuses as necessary.
Checking and replacing
fuses
ABC
A

4506-3. Do-it-yourself maintenance
Blown fuse
Type B
Normal fuse
Blown fuse
Type CNormal fuse
Blown fuse
■After a fuse is replaced
●When installing the lid, make sure
that the tab is installed securely.
●If the lights do n ot turn on even
after the fuse has been replaced,
a bulb may need replacement.
(  P.451)
●If the replaced fuse blows again,
have the vehicle inspected by
your Toyota dealer.
■If there is an overload in a cir-
cuit
The fuses are designed to blow,
protecting the wiring harness from damage.
■When replacing light bulbs
Toyota recommends that you use
genuine Toyota products designed
for this vehicle. Because certain
bulbs are connected to circuits
designed to prevent overload, non-
genuine parts or parts not designed
for this vehicle may be unusable.
B
A
B
A
B
WARNING
■To prevent system break-
downs and vehicle fire
Observe the following precau-
tions.
Failure to do so may cause dam-
age to the vehicle, and possibly a
fire or injury.
●Never use a fuse of a higher
amperage rating than that indi-
cated, or use any other object in
place of a fuse.
●Always use a genuine Toyota
fuse or equivalent.
Never replace a fuse with a
wire, even as a temporary fix.
●Do not modify the fuses or fuse
boxes.
NOTICE
■Before replacing fuses
Have the cause of electrical over-
load determined and repaired by
your Toyota dealer as soon as
possible.
■To prevent damage to the
engine compartment fuse box
cover
When opening the fuse box, com-
pletely release the claw locks
before lifting up the cover. Other-
wise, the claws may be damaged.

4516-3. Do-it-yourself maintenance
6
Maintenance and care
Check the wattage of the light
bulb to be replaced. (P.526)
Rear turn signal lights
Back-up lights
License plate lights
■Lights that need to be
replaced by your Toyota
dealer
 Headlights 
Daytime running lights
 Front turn signal/parking
lights
 Front side marker lights
 Side turn signal lights
 Tail lights
 Stop lights
 Fog lights (if equipped)
 Rear side marker lights
 High mounted stoplight
 Outer foot lights (if equipped)
■LED lights
The lights other than the following
lights each consist of a number of
LEDs. If any of t he LEDs burn out,
take your vehicle to your Toyota
dealer to have the light replaced.
●Rear turn signal lights
●Back-up lights
●License plate lights
■Condensation build-up on the
inside of the lens
Temporary condensation build-up
on the inside of the light lens does
not indicate a mal function. Contact
your Toyota dealer for more infor-
mation in the following situations:
●Large drops of water have built up
on the inside of the lens.
●Water has built up inside the light.
■When replacing light bulbs
 P.450
■Rear turn signal lights
1 Open the back door.
Light bulbs
You may replace the follow-
ing bulbs by yourself. The
difficulty level of replace-
ment varies depending on
the bulb. If necessary bulb
replacement seems difficult
to perform, contact your
Toyota dealer.
For more information about
replacing other light bulbs,
contact your Toyota dealer.
Preparing for light bulb
replacement
Bulb location
A
B
C5HSODFLQJOLJ\
KWEXOE

4526-3. Do-it-yourself maintenance
2Remove the securing screws
and remove the unit.
Remove the lamp assembly by pull-
ing it directly backward from the
rear of the vehicle.
3Turn the bulb base counter-
clockwise.
4 Remove the light bulb. 5
Install a new light bulb.
6 Install the bulb base to the
light unit by inserting it and
turning the bulb base clock-
wise.
7 Align the grooves on the light
unit with the claws, and insert
the light unit straight so that
the pin on the light unit fit into
the hole.
Confirm that the light unit is com-

4536-3. Do-it-yourself maintenance
6
Maintenance and care
pletely secured.
8Reinstall the screws.
■Back-up lights
1 Open the back door and
remove the cover.
To prevent damag e to the cover,
wrap the tip of the screwdriver with
a rag, etc.
2 Turn the bulb base counter-
clockwise.
3 Remove the light bulb.
4 Install a new light bulb.
5 Install the bulb base to the
light unit by inserting it and

4546-3. Do-it-yourself maintenance
turning the bulb base clock-
wise.
6 Reinstall the cover.
■License plate lights
1 Remove the cover.
Using a flathead screwdriver,
remove the cover.
To prevent damage to the vehicle,
wrap the tip of the flathead screw-
driver with tape, etc.
2 Remove the lens.
Lens
Hook
1 Insert a small flathead screw-
driver, etc. into either the
right or left hole of the lens.
2 Push the screwdriver side-
ways in the direction of the
arrow shown in the illustra-
tion, disengage the hook, and
then remove the lens.
To prevent damage to the vehicle,
wrap the tip of th e screwdriver with
tape, etc.
A
B

4556-3. Do-it-yourself maintenance
6
Maintenance and care
3Remove the light bulb.
4 Install a new light bulb.
5 Install the lens.
Hooks
1 Fit the lens into either the right or left hooks.
2 Push the lens into place.
After installation, confirm that the
lens is properly installed by gently
pulling it.
6Install the cover.
A
WARNING
■Replacing light bulb
●Turn off the light. Do not attempt
to replace the bu lb immediately
after turning off the light.
The bulb becomes very hot and
may cause burns.
●Do not touch the glass portion
of the light bulb with bare
hands. When it is unavoidable
to hold the glass portion, use
and hold with a clean dry cloth
to avoid getting moisture and
oils on the bulb.
Also, if the bulb is scratched or
dropped, it may blow out or
crack.
●Fully install light bulb and any
parts used to secure it. Failure
to do so may result in heat dam-
age, fire, or water entering the
light unit. This may damage the
light or cause condensation to
build up on the lens.