2021 TOYOTA SIENNA HYBRID lane assist

3054-5. Using the driving support systems
4
Driving
when driving on the edge of a
lane, and the vehicle in an adja-
cent lane is far away from your
vehicle
• When an accessory (such as a hitch-mounted bicycle carrier) is
installed to the r ear of the vehicle
• When the vehicle is heavily loaded in the luggage compart-
ment
• When there is a significant differ- ence in height between your vehi-
cle and the vehicle that enters the
detection area
• Immediately after the BSM func-
tion/RCTA function are turned on
• When towing a trailer
●Instances of the BSM function
unnecessarily detecting a vehicle
and/or object may increase in the
following situations:
• When the sensor is misaligned
due to a strong impact to the sen-
sor or its surrounding area
• When the distanc e between your
vehicle and a guar drail, wall, etc.
that enters the detection area is
short
• When driving up and down con-
secutive steep inclines, such as
hills, dips in the road, etc.
• When vehicle lanes are narrow, or
when driving on the edge of a
lane, and a vehicle traveling in a
lane other than the adjacent lanes
enters the detection area
• When driving on roads with sharp bends, consecutive curves, or
uneven surfaces
• When the tires are slipping or spinning
• When the distanc e between your
vehicle and a following vehicle is
short
• When an accessory (such as a hitch-mounted bicycle carrier) is
installed to the r ear of the vehicle
• When the vehicle throws up water
or snow behind.
■Operation of the RCTA
function
The RCTA function uses radar
sensors to detect vehicles
approaching from the right or left
at the rear of the vehicle and
alerts the driver of the presence
of such vehicles by flashing the
outside rear view mirror indica-
tors and sounding a buzzer.
Approaching vehicles
Detection areas
■RCTA icon display (if
equipped)
When a vehicle approaching
from the right or left at the rear
of the vehicle is detected, the
following will be displayed on
the audio system screen.
 When the Toyota parking
assist monitor (if equipped) is
displayed
The Rear Cross Traffic
Alert function (if
equipped)
A
B

3394-5. Using the driving support systems
4
Driving
WARNING
■The ABS does not operate
effectively when
●The limits of tire gripping perfor-
mance have been exceeded
(such as excessively worn tires
on a snow covered road).
●The vehicle hydroplanes while
driving at high speed on wet or
slick roads.
■Stopping distance when the
ABS is operating may exceed
that of normal conditions
The ABS is not designed to
shorten the vehicle’s stopping dis-
tance. Always maintain a safe dis-
tance from the vehicle in front of
you, especially in the following sit-
uations:
●When driving on d irt, gravel or
snow-covered roads
●When driving with tire chains
●When driving over bumps in the
road
●When driving over roads with
potholes or uneven surfaces
■TRAC/VSC may not operate
effectively when
Directional control and power may
not be achievable while driving on
slippery road surfaces, even if the
TRAC/VSC system is operating.
Drive the vehicle carefully in con-
ditions where stability and power
may be lost.
■Active Cornering Assist does
not operate effectively when
●Do not overly rely on Active
Cornering Assist. Active Corner-
ing Assist may not operate
effectively when accelerating
down slopes or driving on slip-
pery road surfaces.
●When Active Corn ering 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 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/Tra iler 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.

3434-6. Driving tips
4
Driving
Use fluids that are appropriate
to the prevailing outside tem-
peratures.
• Engine oil
• Engine coolant
• Power control unit coolant
• Washer fluid
Have a service technician
inspect the condition of the
12-volt battery.
 Have the vehicle fitted with
four snow tires or purchase a
set of tire chains for the front
tires.
*
Ensure that all tires are the same
size and brand, and that chains
match the size of the tires.
*: Tire chains cannot be mounted
on vehicles with 20-inch tires.
Winter driving tips
Carry out the necessary
preparations and inspec-
tions before driving the
vehicle in winter. Always
drive the vehicle in a man-
ner appropriate to the pre-
vailing weather conditions.
Pre-winter preparations
WARNING
■Driving with snow tires
Observe the following precautions
to reduce the risk of accidents.
Failure to do so may result in a
loss of vehicle control and cause
death or serious injury.
●Use tires of the specified size.
●Maintain the recommended
level of air pressure.
●Do not drive in excess of 75
mph (120 km/h), regardless of
the type of snow tires being
used.
●Use snow tires on all, not just
some wheels.
■Driving with tire chains (vehi-
cles with 17-inch or 18-inch
tires)
Observe the following precautions
to reduce the risk of accidents.
Failure to do so may result in the
vehicle being unable to be driven
safely, and may cause death or
serious injury.
●Do not drive in excess of the
speed limit specifi ed for the tire
chains being used, or 30 mph
(50 km/h), whichever is lower.
●Avoid driving on bumpy road
surfaces or over potholes.
●Avoid sudden acceleration,
abrupt steering, sudden brak-
ing and shifting operations that
cause sudden engine braking.
●Slow down sufficiently before
entering a curve to ensure that
vehicle control is maintained.
●Do not use LTA (Lane Tracing
Assist) system.

4697-2. Steps to take in an emergency
7
When trouble arises
■PCS warning light (warning buzzer)
■LTA indicator (warning buzzer)
■Intuitive parking assist OFF indicator (warning buzzer)
Warning lightDetails/Actions
(Flashes or illumi-
nates)
When a buzzer sounds simultaneously:
Indicates a malfunction has occurred in the PCS (Pre-
Collision System).
 Have the vehicle insp ected by your Toyota
dealer immediately.
When a buzzer does not sound:
The PCS (Pre-Collision System) has become tempo-
rarily unavailable, correctiv e action may be necessary.
 Follow the instructions d isplayed on the multi-
information display. ( P.265, 480)
If the PCS (Pre-Collision S ystem) or VSC (Vehicle Sta-
bility Control) syst em is disabled, the PCS warning
light will illuminate.
 P.274
Warning lightDetails/Actions
(Orange)
Indicates a malfunction in the LTA (Lane Tracing
Assist)
Follow the instructions d isplayed on the multi-
information display. ( P.285)
Warning lightDetails/Actions
(If equipped)
When a buzzer sounds:
Indicates a malfunction in t he Intuitive parking assist
function
 Have the vehicle insp ected by your Toyota
dealer immediately.
When a buzzer does not sound:
Indicates that the system i s temporarily unavailable,
possibly due to a sensor bei ng dirty or covered with
ice, etc.
 Follow the instructions d isplayed on the multi-
information display. ( P.311, 477)

4807-2. Steps to take in an emergency
ing the power switch to OFF with the
shift lever in any position other than
P.
Shift the shift lever to P.
■If “Shift Is in N Release Acceler-
ator Before Shifting” is shown
Message is displayed when the
accelerator pedal has been
depressed and the shift lever is in N.
Release the accelerator pedal and
shift the shift lever to D or R.
■If “Accelerator Pedal is
Pressed” is displayed
The accelerator pedal has been
depressed when the shift lever is in
P. Release the accelerator pedal.
■If “Press Brake When Vehicle Is
Stopped Hybrid System May
Overheat” is shown
Message is displayed when the
accelerator pedal is depressed to
maintain the vehicle position when
stopped on a upward slope, etc.
If this continues, the hybrid system
may overheat.
Release the accelerator pedal and
depress the brake pedal.
■If “Auto Power Off to Conserve
Battery” is shown
Power was turned off due to the
automatic power off function.
Next time when starting the hybrid
system, operate th e hybrid system
for approximatel y 5 minutes to
recharge the 12-volt battery.
■If “High Power Consumption
Power to Climate Temporarily
Limited” is displayed
Turn off unnecessary electronic
equipment to reduce power con-
sumption.
Please wait until th e power supply
returns to normal.
■If “Headlight System Malfunc-
tion Visit Your D ealer” is dis-
played
The following systems may be mal- functioning.
Have the vehicle inspected by your
Toyota dealer immediately.
●The LED headlight system
●Automatic High Beam
■If “Radar Cruise Control
Unavailable” is shown
The dynamic radar cruise control
with full-speed range system is sus-
pended temporarily or until the prob-
lem shown in the message is
resolved. (causes and coping meth-
ods: P.265)
■If a message that indicates the
malfunction of front camera is
displayed
The following systems may be sus-
pended until the problem shown in
the message is resolved. (P.265,
466)
●PCS (Pre-Collision System)
●LTA (Lane Tracing Assist)
●Automatic High Beam
●RSA (Road Sign Assist) (if
equipped)
●Dynamic radar cruise control with
full-speed range
■If “Oil Maintenance Required
Soon” is displayed
Indicates that the engine oil should
be scheduled to be changed.
Check the engine oil and change it if
necessary.
After changing the engine oil, make
sure to reset t he message.
(  P.418)
■If “Oil Maintenance Required
Visit Your Deale r” is displayed
Indicates that the engine oil should
be changed.
Check and change the engine oil
and oil filter by yo ur Toyota dealer.
After changing the engine oil, make
sure to reset t he message.
(  P.418)

4987-2. Steps to take in an emergency
76 ft•lbf (103 N•m, 10.5 kgf•m)
5Stow the flat tire, tire jack and
all tools.
■The compact spare tire
●The compact spare tire is identi-
fied by the label “TEMPORARY
USE ONLY” on the tire sidewall.
Use the compact s pare tire tem-
porarily, and only in an emer-
gency.
●Make sure to check the tire infla-
tion pressure of the compact
spare tire. ( P.525)
■When using the compact spare
tire
As the compact sp are tire is not
equipped with a tire pressure warn-
ing valve and transmitter, low infla-
tion pressure of the spar e tire will
not be indicated by the tire pressure
warning system. Also, if you replace
the compact spare tire after the tire
pressure warning light comes on,
the light remains on.
■When the compact spare tire is
attached
The vehicle height may become
lower when driving with the compact
spare tire compared to when driving
with standard tires.
■If you have a flat front tire on a
road covered with snow or ice
Install the compact spare tire on one
of the rear wheels of the vehicle.
Perform the following steps and fit
tire chains to the front tires: 1
Replace a rear tire with the com-
pact spare tire.
2 Replace the flat front tire with the
tire removed from the rear of the
vehicle.
3 Fit tire chains to the front tires.
WARNING
■When using the compact
spare tire
●Remember that the compact
spare tire provided is specifi-
cally designed for use with your
vehicle. Do not use your com-
pact spare tire on another vehi-
cle.
●Do not use more than one com-
pact spare tire simultaneously.
●Replace the comp act spare tire
with a standard tire as soon as
possible.
●Avoid sudden acceleration,
abrupt steering, sudden brak-
ing and shifting operations that
cause sudden engine braking.
■When the compact spare tire
is attached
The vehicle speed may not be
correctly detected, and the follow-
ing systems may not operate cor-
rectly:
• ABS & Brake assist
• VSC/Trailer Sway Control
• TRAC
• Dynamic radar cruise control with full-speed range
• PCS (Pre-Collision System)
• EPS
• LTA (Lane Tracing Assist)
• Tire pressure warning system
• AHB (Automatic High Beam)

5498-2. Customization
8
Vehicle specifications
■PCS (Pre-Collision System) (P.267)
■LTA (Lane Tracing Assist) (P.275)
■RSA (Road Sign Assist)* ( P.285)
Shift position linked rear win-
dow wiper operation
(  P.258)
Only once
Off
––OContinuous
FunctionDefault settingCustomized
setting
PCS (Pre-Collision System)OnOff–O–
Adjust alert timingMiddleEarly–O–Late
FunctionDefault settingCustomized setting
Lane centering functionOnOff–O–
Steering assist functionOnOff–O–
Alert typeSteering wheel vibrationBuzzer–O–
Alert sensitivityHighStandard–O–
Vehicle sway warning func-
tionOnOff–O–
Vehicle sway warning sensi-
tivityStandardLow–O–High
FunctionDefault settingCustomized setting
RSA (Road Sign Assist)OnOff–O–
Excess speed notification
methodDisplay only
No notification
–O–Display and buzzer
FunctionDefault settingCustomized settingABC
ABC
ABC
ABC

Alphabetical Index573
Coat hooks .............................. 388
Condenser .............................. 420
Console box ............................ 367
Consumption screen.............. 122
Conversation mirror ............... 370
CoolantChecking .............................. 419
Preparing and c hecking before
winter.................................. 343
Warning light ........................ 467
Cooling system ...................... 419 Hybrid system overheating... 511
Cruise control Dynamic radar cruise control with full-speed range .......... 288
Cup holders ............................ 368
Current fuel consumption ..... 125
Current fuel economy ............ 106
Curtain shield airbags ............. 41
Customizable features ........... 540
D
Daytime running light system248 Replacing light bulbs ............ 451
Defogger Outside rear view mirrors ..... 350
Rear window ........................ 350
Windshield............................ 349
Digital Rear-view Mirror ......... 188 Adjustment ........................... 190
Cleaning ............................... 193
Dinghy towing ........................ 230
Display BSM (Blind Spot Monitor)..... 300
Consumption screen ............ 122
Drive information .................. 111
Driving information ............... 106
Dynamic radar cruise control with full-speed range .......... 288
Energy monitor ..................... 122
Head-up display ................... 118
Intuitive parking assist .......... 308 LTA (Lane Traci
ng Assist) ....281
Multi-information display.......104
RCD (Rear Camera Detection) ...........................................315
RCTA ....................................300
Warning messages ...............477
Do-it-yourself maintenance..................407, 411
Door lock Back door .............................150
Front doors ...........................132
Sliding doors.........................137
Smart key system .................164
Wireless remote control........130
Doors Automatic door locking and unlocking system ................136
Back door .............................150
Door glasses ........................201
Door lock ..............................132
Front doors ...........................132
Open door warning buzzer ...136
Outside rear view mirrors .....198
Sliding door child-protectors .142
Sliding doors.........................137
Drive information ....................111
Driver’s seat belt reminder light ...............................................473
Drive-start control ..................209
Driving Break-in tips .........................209
Correct posture .......................33
Driving mode select switch ...333
Hybrid vehicle dri ving tips .....341
Procedures ...........................208
Winter drive tips....................343
Driving informatio n display ...106
Driving mode select switch ...333
Driving position memory .......178 Memory recall function .........180
Power easy access system ..178
Driving support system informa-