stop start TOYOTA SIENNA HYBRID 2022 Service Manual

3374-5. Using the driving support systems
4
Driving
edly, when the hybrid system is
started or just after the vehicle
begins to move. This sound does
not indicate that a malfunction has
occurred in any of these systems.
●Any of the following conditions
may occur when the above sys-
tems are operating. None of these
indicates that a malfunction has
occurred.
• Vibrations may be felt through the
vehicle body and steering.
• A motor sound may be heard also after the vehicle comes to a stop.
■ECB operating sound
ECB operating sound may be heard
in the following cases, but it does
not indicate that a malfunction has
occurred.
●Operating sound heard from the
engine compartment when the
brake pedal is operated.
●Motor sound of the brake system
heard from the front part of the
vehicle when the driver’s door is
opened.
●Operating sound heard from the
engine compartment when one or
two minutes passed after the stop
of the hybrid system.
■Active Cornering Assist opera-
tion sounds and vibrations
When the Active Cornering Assist is
operated, operation sounds and
vibrations may b e generated from
the brake system, but this is not a
malfunction.
■EPS operation sound
When the steering wheel is oper-
ated, a motor sou nd (whirring
sound) may be heard. This does not
indicate a malfunction.
■Automatic reactivation of
TRAC, Trailer Sway Control and
VSC systems
After turning the TRAC, Trailer
Sway Control and VSC systems off,
the systems will be automatically re-
enabled in the following situations:
●When the power switch is turned
off
●If only the TRAC sy stem is turned
off, the TRAC will turn on when
vehicle speed increases
If both the TRAC and VSC sys-
tems are turned of f, automatic re-
enabling will not occur when vehi-
cle speed increases.
■Operating conditions of Active
Cornering Assist
The system operates when the fol-
lowing occurs.
●TRAC/VSC can operate
●The driver is attempting to accel-
erate while turning
●The system detects that the vehi-
cle is drifting to the outer side
●The brake pedal is released
■Reduced effectiveness of the
EPS system
The effect iveness of the EPS sys-
tem is reduced to prevent the sys-
tem from overheating when there is
frequent steering input over an
extended period of time. The steer-
ing wheel may feel heavy as a
result. Should this occur, refrain
from excessive steering input or
stop the vehicle a nd turn the hybrid
system off. The EPS system should
return to normal within 10 minutes.
■Secondary Collision Brake
operating conditions
The system operates when the SRS
airbag sensor de tects a collision
while the vehicle is in motion. How-
ever, the system does not operate
when the components are dam-
aged.
■Secondary Collision Brake
automatic cancellation
The system is automatically can-
celed in any of th e following situa-
tions.
●The vehicle speed drops to
approximately 6 mph (10 km/h).
●A certain amount of time elapses

3394-5. Using the driving support systems
4
Driving
WARNING
●When Active Cornering Assist
frequently operates, Active Cor-
nering Assist may temporarily
stop operating to ensure proper
operation of the brakes, TRAC
and VSC.
■Hill-start assist control does
not operate effectively when
●Do not overly rely on hill-start
assist control. Hill-start assist
control may not operate effec-
tively on steep inclines and
roads covered with ice.
●Unlike the parking brake, hill-
start assist control is not
intended to hold the vehicle sta-
tionary for an extended period
of time. Do not attempt to use
hill-start assist control to hold
the vehicle on an incline, as
doing so may lead to an acci-
dent.
■When the
TRAC/ABS/VSC/Trailer Sway
Control is activated
The slip indicator light flashes.
Always drive carefully. Reckless
driving may cause an accident.
Exercise particular care when the
indicator light flashes.
■When the TRAC/VSC/Trailer
Sway Control systems are
turned off
Be especially careful and drive at
a speed appropriate to the road
conditions. As these are the sys-
tems to help ensure vehicle stabil-
ity and driving force, do not turn
the TRAC/VSC/Trailer Sway Con-
trol systems off unless necessary.
Trailer Sway Control is part of the
VSC system and will not operate
if VSC is turned off or experiences
a malfunction.
■Replacing tires
Make sure that all tires are of the
specified size, brand, tread pat-
tern and total load capacity. In
addition, make sure that the tires
are inflated to the recommended
tire inflation p ressure level.
The ABS, TRAC, Trailer Sway
Control and VSC systems will not
function correctly if different tires
are installed on the vehicle.
Contact your Toyota dealer for
further information when replacing
tires or wheels.
■Handling of tires and the sus-
pension
Using tires with any kind of prob-
lem or modifying the suspension
will affect the driving assist sys-
tems, and may cause a system to
malfunction.
■Trailer Sway Control precau-
tion
The Trailer Sway Control system
is not able to red uce trailer sway
in all situations. Depending on
many factors such as the condi-
tions of the vehicle, trailer, road
surface and drivi ng environment,
the Trailer Sway Control system
may not be effective. Refer to
your trailer owner’s manual for
information on how to tow your
trailer properly.
■If trailer sway occurs
Observe the following precau-
tions.
Failing to do so may cause death
or serious injury.
●Firmly grip the steering wheel.
Steer straight ahead. Do not try
to control trailer sway by turning
the steering wheel.

3424-6. Driving tips
reports before leaving and avoid
delays as much as possible.
When driving in a traffic jam,
gently release the brake pedal
to allow the vehicle to move for-
ward slightly while avoiding
overuse of the accelerator
pedal. Doing so can help control
excessive gasoline consump-
tion.
Control and maintain the vehicle
at a constant speed. Before
stopping at a toll booth or simi-
lar, allow plenty of time to
release the accelerator and gen-
tly apply the brakes. A greater
amount of electrical energy can
be regenerated when slowing
down.
Use the air conditioning only
when necessary. Doing so can
help reduce excessive gasoline
consumption.
In summer: When the ambient
temperature is high, use the
recirculated air mode. Doing so
will help to reduce the burden on
the air conditioning system and
reduce fuel consumption as
well.
In winter: Because the gasoline
engine will not automatically cut
out until it and the interior of the
vehicle are warm, it will con-sume fuel. Also, fuel consump-
tion can be improved by
avoiding overuse of the heater.
Make sure to check the tire infla-
tion pressure frequently.
Improper tire inflation pressure
can cause poor fuel economy.
Also, as snow tires can cause
large amounts of friction, their
use on dry roads can lead to
poor fuel economy. Use tires
that are appropriate for the sea-
son.
Carrying heavy luggage will lead
to poor fuel economy. Avoid car-
rying unnecessary luggage.
Installing a large roof rack will
also cause poor fuel economy.
Since the gasoline engine starts
up and cuts out automatically
when cold, warming up the
engine is unnecessary. More-
over, frequently driving short
distances will cause the engine
to repeatedly warm up, which
can lead to excess fuel con-
sumption.
Highway driving
Air conditioning
Checking tire inflation
pressure
Luggage
Warming up before driv-
ing

3545-1. Using the air conditioning system and defogger
for functions other than that
operated is maintained.
■Using automatic mode
Fan speed is adjusted automati-
cally according to the temperature
setting and the ambient conditions.
Therefore, the fan may stop for a
while until warm or cool air is ready
to flow immediately after the auto-
matic mode switch is pressed.
This function automatically con-
trols the air conditioning airflow
so that priority is given to the
front seats. When the front pas-
senger seat is not occupied, air-
flow may switch to only the
driver’s seat. Unnecessary air
conditioning is suppressed, con-
tributing to increased fuel effi-
ciency.
Front seat concentrated airflow
mode operates in the following
situations.
 No passengers are detected
in the rear seats
 The windshield defogger is
not operating
While operating, illumi-
nates.
■Manually turning front seat
concentrated airflow mode
on/off
In front seat concentrated air-
flow mode, directing airflow to the front seats only and to all
seats can be switched via switch
operation. When the mode has
been switched manually, auto-
matic airflow control stops oper-
ating.
Press on the air condition-
ing operation panel and switch
the airflow.

Indicator illuminated: Airflow
to the front seats only
 Indicator off: Airflow to all the
seats
■Operation of automatic airflow
control
●In order to maintain a comfortable
interior, airflow may be directed to
seats without passengers immedi-
ately after the hybrid system is
started and at other times depend-
ing on the outside temperature.
●After the hybrid system is started,
if passengers move around inside
or enter/exit the vehicle, the sys-
tem cannot accura tely detect the
presence of passengers and auto-
matic airflow co ntrol will not oper-
ate.
■Operation of manual airflow
control
Even if the funct ion is manually
switched to directing airflow to only
the front seats, w hen a rear seat is
occupied, it may automatically direct
airflow to all seats.
■To return to automatic airflow
control
1 With the indicator off, turn the
power switch off.
2 After 60 minutes or more elapse,
turn the power switch to ON.
Front seat concentrated
airflow mode (S-FLOW)

3595-1. Using the air conditioning system and defogger
5
Interior features
the left-hand side temperature
control switch to adjust the left-
hand rear seats. (The “SYNC” of
“RIGHT SYNC” display on the
rear air conditioning operation
panel disappears)
To change to the synchronous
mode from the individual mode,
press the “OFF” switch and then
press the “AUTO” switch.
■Adjusting the fan speed set-
ting
Operate the fan speed control
switch upwards to increase the
fan speed and downwards to
decrease the fan speed.
Press the “OFF” switch to turn off
the fan.
■Change the airflow mode
Press the airflow mode control
switch.
The airflow mode changes as fol-
lows each time the switch is
pressed.
1 Upper body
2 Upper body and feet 3
Feet
■Ventilation and air conditioning
odors
●During use, various odors from
inside the vehicle may enter into
and accumulate in the air condi-
tioning system. This may then
cause odor to be emitted from the
vents.
●To reduce potential odors from
occurring: The start timing of the
blower may be delayed for a short
period of time immediately after
the air conditioning system is
started in automatic mode.
1Press the “AUTO” switch.
(“AUTO” appears on the dis-
play)
The dehumidification function
begins to operate. Air outlets and
fan speed are automatically
adjusted according to the tempera-
ture setting.
2 Adjust the temperature set-
ting.
3 To stop the operation, press
the “OFF” switch.
If the fan speed se tting or air flow
modes are operated, the automatic
mode indicator goes off. However,
automatic mode for functions other
than that operated is maintained.
MODE
NOTICE
■To prevent 12-volt battery dis-
charge
Do not leave the rear air condi-
tioning system on longer than
necessary when the hybrid sys-
tem is off.
Using the automatic mode

3765-4. Using the other interior features
Rear of console box
Luggage compartment
■When turning the power
outlets off
1 Turn the connected devices
off.
2 Press the AC120V switch to
turn the power outlets off.
3 Disconnect each plug from
the power outlet.
4 Close the lid of each power
outlet.
■The power outlet can be used
when
The READY indicato r is illuminated.
■Rules/regulations regarding
idling stop
The engine will start automatically to
charge the hybrid battery (traction
battery) if its charge becomes low.
In some municipalities, if the engine
starts while the vehicle is parked or stopped, it may violate local rules or
regulations regarding idling stop and
you may be penalized. Make sure to
check the local rules and regula-
tions before using the power outlets
while the vehicle is parked or
stopped.
■Power outlets
●When connecting a device, make
sure that the to
tal power con-
sumption of all devices connected
to the 120 VAC power outlets is
less than 1500 W. If a device is
connected and the power con-
sumption is exce eded, a protec-
tion circuit will cut the power
supply and the p ower outlets will
not be able to be used.
●Depending on the device to be
used, the current flow may be high
and the initial peak wattage may
exceed 1500 W.
In this case, the protection circuit
may operate, and the power out-
lets may not be able to be used.
●Depending on the connected
device, it may cause interference
with TV and radio broadcasts.
●The voltage of the power outlets
cannot be measured with a com-
mercially available electrical tes-
ter. If it is necessary to check the
voltage, have the vehicle
inspected by your Toyota dealer.
●While a power outlet is being
used, a cooling fan sound may be
heard from near a rear seat. This
does not indicate a malfunction.
■Devices which may not operate
correctly
The following 120 VAC devices may
not operate properly even if their
power consumption is less than
1500 W:
●Devices with high initial peak watt-
age
●Measuring devices that process
precise data
●Devices that require an extremely

3785-4. Using the other interior features
WARNING
●Do not attempt to modify, disas-
semble or repair a power outlet.
Also, do not replace the 120
VAC inverter with a commer-
cially available one. For infor-
mation on repairs, contact your
Toyota dealer.
●Be careful not to get any part of
your body caught in the power
outlet lid.
●Do not let children touch the
power outlets.
●Keep the power outlets free of
dust and foreign matter.
●If the plug of a device fits
loosely in a pow er outlet, even
though it is fully inserted,
replace the power outlet. For
information on replacement,
contact your Toyota dealer.
■Using the power outlets while
parked or stopped
Observe the following precau-
tions.
Failure to do so may lead to an
accident, possibly resulting in
death or serious injury.
●Make sure to engage the park-
ing brake and shift the shift
lever to P.
●Do not leave the vehicle unat-
tended while the READY indica-
tor is illuminated and a device is
connected to a power outlet.
●Make sure that the hood is
closed. As the engine will start
automatically depending on the
condition of the vehicle, make
sure that nothing is left near or
contacting the exhaust pipes.
Also, do not put your head or
hands anywhere inside the
engine compartment, as the
cooling fan ma y operate sud-
denly. Keep hands and clothing
(especially a tie, scarf, etc.)
away from the fan as they may
get caught in a fan.
●Do not use the power outlets in
an area with poor ventilation or
an enclosed area, such as a
garage without a ventilation or
exhaust system, o r in an area
where the vehicle may become
surrounded by snow, as the
exhaust gasses may accumu-
late, causing a lack of oxygen.
●Do not use the power outlets if
the vehicle has a vehicle cover
installed.
●Do not sleep in the vehicle while
using devices such as an elec-
tric heater.
■Devices to be connected
Make sure to read a ny instruction
manual which came with a device
and observe any w arnings on the
device. Do not connect a device
to a power outlet if the device is
malfunctioning or its plug is dam-
aged.
Do not use power outlets for med-
ical devices, as the output of the
power outlet may be cut, depend-
ing on the condition of the vehicle.

3825-4. Using the other interior features
■Using the wireless charger
1 Press the power supply
switch of the wireless char-
ger.
Switches on and off with each
press of the power supply switch.
When turned on, the operation indi-
cator light (green) comes on.
Even with the hybrid system off, the
on/off state of the power supply
switch is memorized.
2 Place the charging side of
the portable device down.
When charging, the operation indi-
cator light (orange) comes on.
If charging is not occurring, try plac-
ing the portable device as close to
the center of the charging area as
possible.
When charging is complete, the
operation indicator light (green)
comes on.
■Recharging function
 When charging is complete and after a fixed time in the
charge suspension state,
charging restarts.
 When the portable device is
moved, charging is stopped
for a moment and then it
restarts.
■Lighting conditions of oper-
ation indicator light
*: Depending on the portable
device, there are cases where the
operation indicato r light will con-
tinue being lit u p orange even
after the charging is complete.
 When the operation indicator
light flashes
When an error occurs, the oper-
ation indicator light flashes an
orange color.
Handle the error based on the
following tables.
• Flashing repeatedly once
Operation indicator light
Conditions
Turning off
When the Wireless
charger power supply
is off
Green
(comes
on)
On Standby (charging
possible state)
When charging is com-
plete
*
Orange
(comes
on)
When placing the por-
table device on the
charging area (detect-
ing the portable device)
Charging

3835-4. Using the other interior features
5
Interior features
every second (Orange)
• Repeatedly flashes 3 times continuously (Orange)
• Repeatedly flashes 4 times continuously (Orange)
■The wireless charger can be
operated when
The power switch is in ACC or ON.
■Usable portable devices
Qi standard wireless charge stan-
dard can be used on compatible
devices.
However, not all Qi standard
devices and compat ibility are guar-
anteed.
Starting with mobile phones and
smartphones, it is aimed for low
power electrically supplied portable
devices of no more than 5W.
■When covers and accessories
are attached to portable devices
Do not charge in situations where
cover and accessories not able to
handle Qi are attached to the porta-
ble device. Depending on the type
of cover and acce ssory, it may not
be possible to charge. When
charging is not performed even with
the portable devic e placed on the
charge area, remove the cover and
accessories.
■While charging, noise enters
the AM radio
Turn off the wireless charger and
confirm that the noise has
decreased. If the noise decreases,
continuously pushing the power
supply switch of the wireless char-
ger for 2 seconds, the frequency of
the charger can be changed and the
noise can be reduced.Also, on that
occasion, the operation indicator
light will flash or ange 2 times.
Suspected
causesHandling method
Vehicle to char-
ger communica-
tion failure.
If the power
switch is in ACC:
Turn the power
switch to ON.
If the power
switch is in ON:
Turn the power
switch off and
then back to ON.
If the operation
indicator light still
blinks after per-
forming the
above proce-
dure, contact
your Toyota
dealer.
Suspected causesHandling method
A foreign sub-
stance is
between the por-
table device and
charge area.Remove the for-
eign substance
from between
portable device
and the charge
area.
The portable
device is out of
sync due to the
device being
shifted from the
center of the
charge area.
Place the porta-
ble device near
the center of the
charge area.
Suspected causesHandling method
Temperature ris-
ing within the
wireless charger.Stop charging at
once and start
charging again
after for a while.

3935-4. Using the other interior features
5
Interior features
opener motor will blink twice,
indicating that 2-way commu-
nication is enabled.
If the indicators do not flash, per-
form 2 and 3 within the first 10
presses of the HomeLink
® button
after programming has been com-
pleted.
2 Press a programmed
HomeLink
® button to oper-
ate a garage door.
3 Within 1 minute of pressing
the HomeLink
® button, after
the garage door operation
has stopped, press the
“Learn” or “Smart” button on
the garage door opener
motor. Within 5 seconds of
the establishment of 2-way
communication with the
garage door opener, both
garage door operation indica-
tors in the vehicle will flash
rapidly (green) and the light
on the garage door opener
motor will blink twice, indicat-
ing that 2-way communica-
tion is enabled.
■Reprogramming a single
HomeLink
® button
When the following procedure is
performed, buttons which
already have devices registered
to them can be overwritten:
1 Press and hold the desired
HomeLink
® button.
2 When the HomeLink
® indica-
tor starts flashing orange, release the HomeLink
® but-
ton and perform “Program-
ming HomeLink
®” 1 (it takes
20 seconds for the
HomeLink
® indicator to start
flashing).
■Before programming
●Install a new battery in the trans-
mitter.
●The battery side of the transmitter
must be pointed away from the
HomeLink
® buttons.
Press the appropriate
HomeLink
® button. The
HomeLink
® indicator light
should turn on.
The status of the opening and
closing of a garage door is
shown by the garage door oper-
ation indicators.
Vehicles with auto anti-glare
inside rear view mirror
Opening
Closing
Operating HomeLink®
A
B