4WD TOYOTA SIENNA 2018 Owners Manual (in English)

224
SIENNA_OM_OM08019U_(U)
4-1. Before driving
Dinghy towing
Your vehicle is not designed to be dinghy towed (with 4 wheels
on the ground) behind a motor home.
NOTICE
■To avoid serious damage to your vehicle
■ To prevent causing serious damage to the transaxle and Active T orque
Control 4WD system (AWD models)
Do not tow your vehicle with four wheels
on the ground.
ITN25N009
2WD models: Never tow this vehicle from
the rear with the front wheels on the
ground. This may cause serious damage
to the transaxle.
AWD models: Never tow this vehicle with
any of the wheels on the ground. This
may cause serious damage to the tran-
saxle and Active Torque Control 4WD
system.
ITN25N010
ITN25N011

322
SIENNA_OM_OM08019U_(U)
4-5. Using the driving support systems
Driving assist systems
◆ABS (Anti-lock Brake System)
Helps to prevent wheel lock when the brakes are applied suddenl y,
or if the brakes are applied while driving on a slippery road surface
◆Brake assist
Generates an increased level of braking force after the brake p edal
is depressed when the system de tects a panic stop situation
◆VSC (Vehicle Stability Control)
Helps the driver to control skidding when swerving suddenly or
turning on slippery road surfaces
◆TRAC (Traction Control)
Helps to maintain drive power and prevent the drive wheels from
spinning when starting the vehicle or accelerating on slippery roads
◆Hill-start assist control
Helps to prevent the vehicle from rolling backward when startin g on
an incline or slippery slope
◆EPS (Electric Power Steering)
Employs an electric motor to reduce the amount of effort needed to
turn the steering wheel
◆Active Torque Control 4WD (AWD models only)
Automatically switches from front-wheel drive to AWD (All-Wheel
Drive) according to driving conditions, helping to ensure relia ble
handling and stability. Examples of conditions where the system will
switch to AWD are when corneri ng, going uphill, starting off or
accelerating, and when the road surface is slippery due to snow or
rain etc.
To help enhance driving safety and performance, the following
systems operate autom atically in response to various driving
situations. Be aware, however, that these systems are supple-
mentary and should not be relied upon too heavily when operat-
ing the vehicle.

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SIENNA_OM_OM08019U_(U)
4-5. Using the driving support systems
WARNING
■TRAC may not operate effectively when
Directional control and power may not be achievable while driving on slip-
pery road surfaces, even if the TRAC system is operating.
Drive the vehicle carefully in conditions where stability and p ower may be
lost.
■ Hill-start assist control
● Do not overly rely on hill-start assist control. Hill-start ass ist control may
not operate effectively on steep inclines and roads covered wit h ice.
● Unlike the parking brake, hill-start assist control is not inte nded to hold the
vehicle stationary 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 accident.
■ When the VSC 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 systems are turned off
Be especially careful and drive at a speed appropriate to the r oad condi-
tions. As these are the systems to help ensure vehicle stabilit y and driving
force, do not turn the TRAC/VSC systems off unless necessary.
■
Replacing tires
Make sure that all tires are of the specified size, brand, trea d pattern
and total load capacity. In addition, make sure that the tires are inflated
to the recommended tire inflation pressure level.
The ABS, TRAC and VSC systems will not function correctly if di fferent
tires are installed on the vehicle.
Contact your Toyota dealer for further information when replaci ng tires
or wheels.
■Handling of tires and suspension
Using tires with any kind of probl em or modifying the suspension will
affect the driving assist system s, and may cause the system to malfunc-
tion.
■ Active Torque Control 4WD system (AWD models only)
● The AWD system of this vehicle is intended to ensure driving st ability on
normal roads. It is not designed for use in demanding situation s such as
rally driving.
● Take care when driving on slippery road surfaces.

4687-2. Steps to take in an emergency
SIENNA_OM_OM08019U_(U)
NOTICE
■To prevent damage to the vehicle when towing using a wheel-lift type
truck
When raising the vehicle, ensure adequate ground clearance for towing at
the opposite end of the raised vehicle. Without adequate cleara nce, the
vehicle could be damaged while being towed.
■ To prevent damage to the vehicle when towing with a sling-type truck
Do not tow with a sling-type truck, either from the front or re ar.
■ Recreational towing (behind motor home, etc.)
Never dinghy tow your vehicle to prevent
causing serious damage to the Active
Torque Control 4WD system (AWD mod-
els) and transaxle. ( P. 224)

4837-2. Steps to take in an emergency
SIENNA_OM_OM08019U_(U)
7
When trouble arises
■Warning messages
The warning messages explained below may differ from the actual messages
according to operation conditions and vehicle specifications.
■ If a message that indicates the need for contacting or visiting your TOY-
OTA dealer is shown
The system or part shown on the multi-information display is ma lfunctioning.
Have the vehicle inspected by your Toyota dealer.
■ If “Auto Power Off to Con serve Battery” is shown
Power was turned off due to the automatic power off function. N ext time when
starting the engine, increase the engine speed slightly and mai ntain that level
for approximately 5 minutes to recharge the battery.
■ If “Shift to P Before Exiting Vehicle” is shown
The driver’s door is opened without turning the engine switch t o off with the
shift lever in any position other than P. Shift the shift lever to P.
■ If “Front Camera Unavailable” or “Front Camera Unavailable Remove
Debris On Windshield” is shown
The following systems may be suspended until the problem shown in the
message is resolved.
● PCS (Pre-Collision system)
● LDA (Lane Departure Alert with steering control)
● Dynamic radar cruise control
● Automatic High Beam
■ If “AWD System Overheated 2WD Mode Engaged” or “AWD System
Overheated Switching To 2WD Mode” is shown
The Active Torque Control 4WD system has overheated. Immediatel y stop
the vehicle in a safe place and contact your Toyota dealer.
■ If “Low Engine Oil Add or Replace” is shown
The engine oil level is low. Check the level of engine oil, and add if necessary.
This message may appear if the vehicle is stopped on a slope. M ove the
vehicle to a level surface and check to see if the message disa ppears.
■ If “Maintenance Required Soon” is shown
The engine oil is scheduled to be changed. Check the engine oil, and change
if necessary. After changing the engine oil, the message should be reset.
( P. 398)

570Alphabetical index
SIENNA_OM_OM08019U_(U)
Alphabetical index
A/C .................................... 332, 341Air conditioning filter ............. 434
Front automatic air
conditioning system ............ 332
Rear automatic air
conditioning system ............ 341
ABS (Anti-lock Brake System) .................................. 322
Function ................................ 322
Warning light ......................... 472
Active head restraint ............... 150
Active Torque Control
4WD system ........................... 322 Function ................................ 322
Warning message ................. 483
Air conditioning filter .............. 434
Air conditioning system Air conditioning filter ............. 434
Front automatic air conditioning system ............ 332
Rear automatic air conditioning system ............ 341
Airbags ....................................... 38
Airbag operating conditions ............................. 47
Airbag precautions for your child ......................... 41
Airbag warning light .............. 472
Correct driving posture ........... 28
Curtain shield airbag operating conditions ............. 48
Curtain shield airbag precautions ........................... 41
Front passenger occupant classification syst em............. 52
General airbag
precautions ........................... 41
Locations of airbags................ 38
Modification and disposal of airbags ............... 46 Side and curtain shield
airbags operating
conditions ............................. 48
Side and curtain shield airbags precautions .............. 41
SRS airbag instructions for Canadian owners .......... 555
SRS airbags ........................... 38
Alarm Alarm ...................................... 79
Warning buzzer .................... 471
Anchor brackets ........................ 62
Antenna (smart key system) .................................. 143
Anti-lock brake system (ABS) ...................................... 322 Function ................................ 322
Warning light......................... 472
Approach warning ................... 296
Armrest..................................... 370
Assist grips .............................. 371
Audio input
*
Audio visual input*
Audio/visual system*
Automatic High Beam ............. 246 Warning message................. 483
Automatic light control
system.................................... 244
Automatic transaxle Automatic transaxle .............. 233
If the shift lever cannot be
shifted from P ..................... 237
S mode ................................. 235
AUX port
*
Auxiliary box ........................... 358
A/V input port
*
A