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5
When trouble arises
737
5-1. Essential information
SIENNA_OM_OM45483U_(U)
If your vehicle needs to be towed
Before towingThe following may indicate a problem with your transaxle. Contact
your Toyota dealer before towing.
● The engine is running but the vehicle will not move.
● The vehicle makes an abnormal sound.
If towing is necessary, we recommend having your vehicle towed by
your Toyota dealer or a commercial towing service, using a wheel-lift
type truck or flat bed truck.
Use a safety chain system for all to wing, and abide by all state/pro-
vincial and local laws.
2WD models: If towing your vehicle with a wheel-lift type truck from
the front, the vehicle’s rear wheels and axles must be in good condi-
tions. ( P. 738, 740)
If they are damaged, use a towing dolly or flat bed truck.
AWD models: If towing your vehicle with a wheel-lift type truck, use a
towing dolly. ( P. 738, 740)
Page 750 of 872

750 5-2. Steps to take in an emergency
SIENNA_OM_OM45483U_(U)
*1:Open door warning buzzer:A buzzer will sound if the vehicle reaches a speed of 3 mph (5 km/h) with any
door open.
*2:Driver’s and front passenger’s seat belt warning buzzers:The driver’s and front passenger’s seat belt warning buzzers sound to alert
the driver and front passenger that his or her seat belt is not fastened. The
buzzer sounds intermittently for 10 seconds after the vehicle has reached a
speed of 12 mph (20 km/h). Then, if the seat belt is still unfastened, the
buzzer will sound at a different tone for 20 more seconds.
*3:Refer to the separate “Scheduled Maintenance Guide” or “Owner’s ManualSupplement” for the maintenance interval applicable to your vehicle.
Warning lightWarning light/DetailsCorrection procedure
(AWD models) Active Torque Control
4WD system warning light
When the light blinks: The
system has been over-
loaded and front-wheel
drive has been automati-
cally engaged. Drop your speed or stop the
vehicle until the light stops
blinking. (Do not stop the
engine.)
When the light comes on:
Malfunction in the Active
Torque Control 4WD sys-
tem. Have the system checked
by your Toyota dealer.
Page 754 of 872
754 5-2. Steps to take in an emergency
SIENNA_OM_OM45483U_(U)
■If the tire pressure warning light frequently comes on after blinking
for 1 minute
Vehicles without a smart key system
If the tire pressure warning light frequently comes on after blinking 1
minute when the engine switch is turned to the “ON” position, have it
checked by your Toyota dealer.
Vehicles with a smart key system
If the tire pressure warning light frequently comes on after blinking 1
minute when the “ENGINE START STOP” switch is turned to IGNITION
ON mode, have it checked by your Toyota dealer.
■ Customization that can be co nfigured at Toyota dealer
The vehicle speed linked seat belt reminder buzzer can be disabled.
(Customizable features: P. 828) However, Toyota recommends that the
seat belt reminder buzzer be operational to alert the driver and front passen-
ger when seat belts are not fastened.
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When trouble arises
777
5-2. Steps to take in an emergency
SIENNA_OM_OM45483U_(U)
Emergency start function (vehicles with a smart key system)
When the engine does not start, the following steps can be used as
an interim measure to start the engine if the “ENGINE START STOP”
switch is functioning normally: Set the parking brake.
Shift the shift lever to P.
Turn the “ENGINE START STOP” switch to ACCESSORY
mode.
Press and hold the “ENGINE START STOP” switch for about
15 seconds while depressing the brake pedal firmly.
Even if the engine can be start ed using the above steps, the system
may be malfunctioning. Have the vehicle inspected by your Toyota
dealer.
■ The starter motor does not turn over, the interior lights and
headlights do not turn on, or the horn does not sound.
One of the following may be the cause of the problem:
● One or both of the battery terminals may be disconnected.
● The battery may be discharged. ( P. 784)
● There may be a malfunction in the steering lock system (vehi-
cle with a smart key system).
Contact your Toyota dealer if the problem cannot be repaired, or if
repair procedures are unknown.
STEP1
STEP2
STEP3
STEP4
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When trouble arises
783
5-2. Steps to take in an emergency
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■
Stopping the engine
Shift the shift lever to P and press the “ENGINE START STOP” switch as
you normally do when stopping the engine.
■ Replacing the key battery
As this above procedure is a temporary measure, it is recommended that the
electronic key battery be replaced immediately when the battery depletes.
(P. 708)
■ Alarm (if equipped)
Using the mechanical key to lock the doors will not set the alarm system.
If a door is unlocked using the mechanical key when the alarm system is set,
the alarm may be triggered. ( P. 163)
■ Changing “ENGINE START STOP” switch modes
Within 10 seconds of the buzzer sounding, release the brake pedal and
press the “ENGINE START STOP” switch.
The engine does not start and modes will be changed each time the switch
is pressed. ( P. 233)
Page 786 of 872

786 5-2. Steps to take in an emergency
SIENNA_OM_OM45483U_(U)
Start the engine of the second vehicle. Increase the engine
speed slightly and maintain at that level for approximately 5
minutes to recharge the battery of your vehicle.
Vehicles with a smart key system only: Open and close any
of the doors of your vehicle with the “ENGINE START
STOP” switch off.
Maintain the engine speed of the second vehicle and start
the engine of your vehicle by turning the engine switch to
the “ON” position (vehicles without a smart key system) or
turning the “ENGINE START STOP” switch to IGNITION
ON mode (vehicles with a smart key system).
Once the vehicle’s engine has started, remove the jumper
cables in the exact reverse or der from which they were con-
nected.
To install the engine cover, conduct the removal procedure
in reverse. After installing, check that the fixed pins are
inserted securely.
Once the engine starts, have the vehicle inspected at your Toyota
dealer as soon as possible.STEP3
STEP4
STEP5
STEP6
STEP7
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799
6-1. Specifications
6
Vehicle specifications
SIENNA_OM_OM45483U_(U)
*1: Unladen vehicle
*2: The model code is indicated on the Certification Label. For details, see
“Vehicle identification” below.
*3: The towing package is required.Toyota does not recommend towing with this vehicle without the towing
package.
Vehicle identification
■ Vehicle identification number
The vehicle identificati on number (VIN) is the legal identifier for your
vehicle. This is the primary identification number for your Toyota. It is
used in registering the ownership of your vehicle.
This number is stamped on the
top left of the instrument panel.
This number is also on the Certi-
fication Label on the driver’s side
center pillar.
Trailer Weight Rating
(TWR)
(Trailer weight
+ cargo weight)
(with towing package
*3)
Without brake 1000 lb. (454 kg)
With brake3500 lb. (1588 kg)
Page 808 of 872
808 6-1. Specifications
SIENNA_OM_OM45483U_(U)Compact spare tire (2WD models)
Tire size
T155/80R17 101M
Tire inflation pressure
(Recommended cold tire
inflation pressure)60 psi (420 kPa, 4.2 kgf/cm2 or bar)
Wheel size
17 x 4T
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)