2021 TOYOTA SIENNA HYBRID battery

851-4. Hybrid system
1
For safety and security
There are air intake vents under
the front seats for the purpose of
cooling the hybrid battery (trac-
tion battery). If the vent
becomes blocked, the hybrid
battery (traction battery) may
overheat, leading to a reduction
in hybrid battery (traction bat-
tery) output.
WARNING
●If a fire occurs in the hybrid
vehicle, leave the vehicle as
soon as possible. Never use a
fire extinguisher that is not
meant for electric fires. Using
even a small amount of water
may be dangerous.
●If your vehicle needs to be
towed, do so with four wheels
raised. If the wheels connected
to the electric motor (traction
motor) are on the ground when
towing, the motor may continue
to generate electricity. This may
cause a fire. ( P.462)
●Carefully inspect the ground
under the vehicle. If you find
that liquid has leaked onto the
ground, the fuel system may
have been damaged. Leave the
vehicle as soon as possible.
■Hybrid battery (traction bat-
tery)
●Never resell, hand over or mod-
ify the hybrid battery. To prevent
accidents, hybrid batteries that
have been removed from a dis-
posed vehicle are collected
through Toyota dealer. Do not
dispose of the battery yourself.
Unless the battery is properly col-
lected, the follo wing may occur,
resulting in dea th or serious
injury:
• The hybrid battery may be ille- gally disposed of or dumped,
and it is hazardous to the envi-
ronment or someone may touch
a high voltage part, resulting in
an electric shock.
• The hybrid battery is intended to be used exclusively with your
hybrid vehicle. If the hybrid bat-
tery is used out side of your
vehicle or modified in any way,
accidents such as electric
shock, heat generation, smoke
generation, an explosion and
electrolyte leakage may occur.
When reselling or handing over
your vehicle, the possibility of an
accident is extremely high
because the person receiving the
vehicle may not be aware of these
dangers.
●If your vehicle is disposed of
without the hybrid battery hav-
ing been removed, there is a
danger of serious electric shock
if high voltage parts, cables and
their connectors are touched. In
the event that your vehicle must
be disposed of, the hybrid bat-
tery must be disposed of by
your Toyota dealer or a qualified
service shop. If the hybrid bat-
tery is not disposed of properly,
it may cause electric shock that
can result in dea th or serious
injury.
Hybrid battery (traction
battery) air intake vents

861-4. Hybrid system
When a certain level of impact is
detected by the impact sensor,
the emergency shut off system
blocks the high voltage current
and stops the fuel pump to mini-
mize the risk of electrocution
and fuel leakage. If the emer-
gency shut off system activates,
your vehicle will not restart. To
restart the hybrid system, con-
tact your Toyota dealer.
A message is automatically dis-
played when a malfunction
occurs in the hybrid system or
an improper operation is
attempted.
If a warning message is shown
on the multi-information display,
read the message and follow the
NOTICE
■Hybrid battery (traction bat-
tery) air intake vents
●Make sure not to block the air
intake vents with anything, such
as a seat cover, plastic cover, or
luggage. If the vents become
blocked, the hybrid battery
(traction battery) input and out-
put may be restricted, leading to
a reduction in hybrid battery
(traction battery) output and a
malfunction.
●When dust etc. has accumu-
lated in the air intake vents,
clean them with a vacuum
cleaner to prevent the vents
from clogging.
●Do not get water or foreign
materials in the air intake vents
as this may cause a short circuit
and damage the hybrid battery
(traction battery).
●Do not carry large amounts of
water such as water cooler bot-
tles in the vehicle. If water spills
onto the hybrid battery (traction
battery), the battery may be
damaged. Have the vehicle
inspected by your Toyota
dealer.
●There are filters installed to the
air intake vents. When the filters
remain noticeably dirty even
after cleaning the air intake
vents, filters cleaning or
replacement is recommended.
For information regarding filters
cleaning or replacement, refer
to P.444.
●If “Maintenance Required for
Traction Battery Cooling Parts
See Owner’s Manual” is shown
on the multi-information dis-
play, the air intake vents and fil-
ters may be clogged. Refer to
P.443for information on how to
clean the air intake vents.
Emergency shut off sys-
tem
Hybrid warning message

871-4. Hybrid system
1
For safety and security
instructions.
■If a warning light comes on, a
warning message is displayed,
or the 12-volt battery is discon-
nected
The hybrid system may not start. In
this case, try to start the system
again. If the “READY” indicator does
not come on, contact your Toyota
dealer.

901-5. Theft deterrent system
If a door is unlocked using the
mechanical key while the alarm is
set, a warning will sound intermit-
tently for approximately 10 seconds.
If the alarm is not canceled or
stopped during this time, the warn-
ing pattern change s and the warn-
ing sounds for a certain period of
time.
●A person inside the vehicle opens
a door or hood, or unlocks the
vehicle using an inside lock but-
ton.
●The 12-volt battery is recharged or
replaced when the vehicle is
locked. ( P.506)
■Alarm-operated door lock
In the following cases, depending
on the situation, th e door may auto-
matically lock to p revent improper
entry into the vehicle:
●When a person left in the vehicle
triggers the alarm by unlocking a
door or the back door.
●When a person lef t in the vehicle
unlocks a door or the back door
while the alarm is operating.
●When recharging or replacing the
12-volt battery.
NOTICE
■To ensure the system oper-
ates correctly
Do not modify or remove the sys-
tem. If modified or removed, the
proper operation of the system
cannot be guaranteed.

982-1. Instrument cluster
Oil maintenance:
Displays the distance until the next engine oil change.
Shift position and shift range indicator
Displays the selected shift posit ion or selected shift range (P.238)
Outside temperature ( P.98)
Engine coolant temperature gauge
Displays the engine c oolant temperature
■The meters and display illumi-
nate when
The power swit ch is in ON.■When changing driving mode
Speedometer color is changed fol-
lowing the selected driving mode.
(  P.333)
■Hybrid System Indicator
READY OFF area
Shows that the hybrid system is not
operating.
Charge area
Shows regeneration
* status.
Regenerated e nergy will be used to
charge the hybrid battery (traction
battery).
Hybrid Eco area
Shows that gasoline engine power
is not being used very often.
The gasoline engine will automati- cally stop and restart under various
conditions.
Eco area
Shows that the vehicle is being
driven in an Eco-friendly manner.
By keeping the indicator needle
within Eco area, more Eco-friendly
driving can be achieved.
Power area
Shows that an Eco-friendly driving
range is being exceeded (during full
power driving etc.)
*: When used in this manual, “regen-
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1022-1. Instrument cluster
Oil maintenance:
Displays the distance until the next engine oil change.
Shift position and shift range indicator
Displays the selected shift posit ion or selected shift range (P.238)
Outside temperature ( P.102)
Engine coolant temperature gauge
Displays the engine c oolant temperature
■The meters and display illumi-
nate when
The power swit ch is in ON.■When changing driving mode
Speedometer color is changed fol-
lowing the selected driving mode.
(  P.333)
■Hybrid System Indicator
READY OFF area
Shows that the hybrid system is not
operating.
Charge area
Shows regeneration
* status. Regen-
erated energy will be used to charge
the hybrid battery (traction battery).
Hybrid Eco area
Shows that gasoline engine power
is not being used very often.
The gasoline engine will automati-
cally stop and rest art under various
conditions. Eco area
Shows that the vehicle is being
driven in an Eco-friendly manner.
By keeping the indicator needle
within Eco area, more Eco-friendly
driving can be achieved.
Power area
Shows that an Eco-friendly driving
range is being exceeded (during full
power driving etc.)
*: When used in this manual, “regen- eration” refers to the conversion of
energy created by the movement
of the vehicle into electrical
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1172-1. Instrument cluster
2
Vehicle status information and indicators
Select to reset the meter display
settings.
■Suspension of the settings dis-
play
●In the following situations, opera-
tion of the setting s display will be
temporarily suspended.
• When a warning message appears on the multi-information
display
• When the vehicle begins to move
●Settings for functions not
equipped to the vehicle are not
displayed.
●When a function is turned off, the
related settings for that function
are not selectable.
Select to display warning mes-
sages and measures to be
taken if a malfunction is detected. (
P.477)
Displays suggestions to the
driver in the following situations.
To select a response to a dis-
played suggestion, use the
meter control switches.
■Suggestion to turn on the
headlights
If the headlight switch is in other
than or , and the vehicle
speed is 3 mph (5 km/h) or
higher for a certain amount of
time when the surroundings are
dark, a suggestion message will
be displayed.
■Suggestion to turn off the
headlights
If the headlights are left on for a
certain amount of time after the
power switch has been turned
off, a suggestion message will
be displayed.
When the headlight switch is in
the AUTO position: The mes-
sage asking if you wish to turn
the headlights off is displayed.
To turn the headlights off, select
“Yes”.
If the driver’s door is opened after
the power switch is turned off, this
suggestion message will not be dis-
played.
■Customization
The suggestion fu nction can be
turned on/off. (Customizable fea-
WARNING
■Cautions during setting up
the display
As the hybrid system needs to be
operating during setting up the
display, ensure that the vehicle is
parked in a place with adequate
ventilation. In a closed area such
as a garage, exhaust gases
including harmful carbon monox-
ide (CO) may collect and enter
the vehicle. This may lead to
death or a seri ous health hazard.
NOTICE
■During setting up the display
To prevent 12-vo lt battery dis-
charge, ensure that the hybrid
system is operating while setting
up the display features.
Warning message dis-
play ( )
Suggestion function

1202-1. Instrument cluster
■Enabling/disabling the
head-up display
Select on the multi-informa-
tion display, select “Vehicle Set-
tings” (4.2-inch) / (7-inch)
and then select “HUD Main”.
“ON” and “OFF” switches each
time when “OK” is pressed.
■Changing settings of the
head-up display
The following settings can be
changed on “HUD Main” of the
multi-information display.
( P.112)
Press and hold “OK” to display
the following settings:
 “HUD Brightness/Position”
Select to adjust t he brightness or
vertical position of the head-up dis-
play.
 “HUD Driving Support”
• Tachometer Settings
Blank/Hybrid System/Tachometer
Select to change the display to
blank (no display)/Hybrid System Indicator/tachometer.
Select to enable/d
isable the follow-
ing items:
• Navigation (if equipped)
• Driving Assist
• Compass (if equipped)
•Audio
 “HUD Rotation”
Select to adjus t the angle of the
head-up display.
P r e s s t h e o r s w i t c h t o a d j u s t
the angle of the head-up display.
■Enabling/disabling of the head-
up display
If the head-up display is disabled, it
will remain disabled when the power
switch is turned off then back to ON.
■Display brightness
The brightness of the head-up dis-
play can be adjusted on of the
multi-information di splay. Also, it is
automatically adjusted according to
the ambient brightness.
■Head-up display automatic
position adjustment (vehicles
with driving position memory)
If the display position is recorded
into memory, the head-up display
will be automatically adjusted to the
desired position. ( P.178)
■When the 12-volt battery is dis-
connected
The customize settings of the head-
up display will be reset.
●Do not place anything on or put
stickers onto the head-up dis-
play projector.
Doing so could interrupt head-
up display indications.
●Do not touch the inside of the
head-up display projector or
thrust sharp edges or the like
into the projector.
Doing so could cause mechani-
cal malfunctions.
Using the head-up display