2012 TOYOTA SIENNA snow chains

331
2-4. Using other
driving systems
2
When driving
SIENNA_U (OM45477U)
■Reduced effectiveness of the EPS system
The effectiveness of the EPS system is reduced to prevent the system from
overheating when there is frequent steering input over an extended period of
time. The steering wheel may feel heavy as a result. Should this occur,
refrain from excessive steering input or stop the vehicle and turn the engine
off. The EPS system should return to normal within 10 minutes.
CAUTION
■ABS does not operate effectively when
● Tires with inadequate gripping ability are used (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 ABS is oper ating may exceed that of normal
conditions
The ABS is not designed to shorten the vehicle’s stopping distance. Always
maintain a safe distance from the vehicle in front of you in the following situ-
ations.
● When driving on dirt, gravel or snow-covered roads
● When driving with tire chains
● When driving over bumps in the road
● When driving over roads with potholes or roads with uneven surfaces
■ 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.
Do not drive the vehicle in conditions where stability and power may be lost.

352
2-5. Driving information
SIENNA_U (OM45477U)
Winter driving tips
Carry out the necessary preparations and inspections before driving
the vehicle in winter. Always drive the vehicle in a manner appropri-
ate to the prevailing weather conditions.
■ Pre-winter preparations
●Use fluids that are appropriate to the prevailing outside tem-
peratures.
• Engine oil
• Engine coolant
• Washer fluid
● Have a service technician inspect the level and specific grav-
ity of battery electrolyte.
● 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.
■Before driving the vehicle
Perform the following according to the driving conditions:
●Do not try to forcibly open a window or move a wiper that is
frozen. Pour warm water over the frozen area to melt the ice.
Wipe away the water immediately to prevent it from freezing.
● To ensure proper operation of th e climate control system fan,
remove any snow that has accumulated on the air inlet vents
in front of the windshield.
● Remove any ice that has accumu lated on the vehicle chassis.
● Periodically check for and remove any excess ice or snow
that may have accumulated in the wheel well or on the
brakes.

354 2-5. Driving information
SIENNA_U (OM45477U)
■Tire chain installation
Observe the following precautions when installing and removing chains.
● Install and remove tire chains in a safe location.
● Install tire chains on the front tires only. Do not install tire chains on the
rear tires.
● Install tire chains on front tires as tightly as possible. Retighten chains
after driving 1/4 - 1/2 mile (0.5 - 1.0 km).
● Install tire chains following the instructions provided with the tire chains.
CAUTION
■Driving with snow tires
Observe the following precautions to reduce the risk of accidents.
Failing to do so may result in a loss of vehicle control and cause death or
serious injury.
● Use tires of the size specified.
● 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.

355
2-5. Driving information
2
When driving
SIENNA_U (OM45477U)
CAUTION
■
Driving with tire chains
Observe the following precautions to reduce the risk of accidents.
Failing 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 specified 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 turns and braking, as use of chains may adversely affect
vehicle handling.
● Slow down sufficiently before entering a curve to ensure that vehicle con-
trol is maintained.
NOTICE
■Repairing or replacing snow tires
Request repairs of or replacement of snow tires from Toyota dealers or legit-
imate tire retailers.
This is because the removal and attachment of snow tires affects the opera-
tion of the tire pressure warning valves and transmitters.
■ Fitting tire chains
The tire pressure warning valves and transmitters may not function correctly
when tire chains are fitted.

5
When trouble arises
739
5-2. Steps to take in an emergency
SIENNA_U (OM45477U)
■If the tire pressure warning system is inoperative
The tire pressure warning system will be disabled in the following condi-
tions:
(When the condition be
comes normal, the system will work properly.)
●If tires not equipped with tire pressure warning valves and transmit-
ters are used.
●If the ID code on the tire pressure warning valves and transmitters is
not registered in the tire pressure warning computer.
The tire pressure warning system may be disabled in the following condi-
tions:
(When the condition be comes normal, the system will work properly.)
●If electronic devices or facilities using similar radio wave frequencies
are nearby.
●If a radio set at similar frequencies is in use in the vehicle.
●If there is a lot of snow or ice on the vehicle, in particular around the
wheels or wheel housings.
●If non-genuine Toyota wheels are used. (Even if you use Toyota
wheels, the tire pressu re warning system may not work properly with
some types of tires.)
●If tire chains are used.

756 5-2. Steps to take in an emergency
SIENNA_U (OM45477U)
■Jack point guide
■After completing the tire change
The tire pressure warning system must be reset. ( P. 674)
■When using the compact spare tire
As the compact spare tire is not equipped with a tire pressure warning
valve and transmitter, low inflation pressure of the spare tire will not be
indicated by the tire pressure warn ing system. Also, if you replace the
compact spare tire after the tire pressure warning light comes on, the
light remains on.
■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:
Replace a rear tire with the compact spare tire.
Replace the flat front tire with the tire removed from the rear of
the vehicle.
Fit tire chains to the front tires.
The jack point guides are located on
the side of rocker moulding. They indi-
cate the jack point positions.
STEP1
STEP2
STEP3

852 Alphabetical index
SIENNA_U (OM45477U)
Spare tireInflation pressure...................794
Storage location .................... 747
Spark plug ................................790
Specifications...........................784
Speech command switch ........ 535
Speedometer ............................ 244
Steering wheel Adjustment ............................ 137
Audio switches ......................463
Column lock release......227, 233
Stop lights
Replacing light bulbs ............. 709
Wattage .................................796
Storage feature.........................572
Storage precautions ................348
Stuck If your vehicle becomes
stuck ...................................778
Sunshades Rear door ..............................602
Roof....................................... 150
Sun visors.................................590
Switch Engine switch ................226, 229
Fog light switch ..................... 280
Ignition switch................226, 229
Light switches........................ 266
Power back door .....................82
Power door lock switch ...........61
Power window switch ....144, 148
Window lock switch ............... 144
Wiper and washer switch .......................... 282, 290 Tachometer .............................. 244
Tail lights
Replacing light bulbs ............. 709
Switch ................................... 266
Wattage................................. 796
Talk switch ............................... 535
Telephone switch..................... 535
Theft deterrent system Alarm..................................... 162
Engine immobilizer
system ................................ 159
Theft prevention labels ........... 165
Tire inflation pressure ............. 683
Tire information Glossary ................................ 808
Size ....................................... 794
Tire identification number...... 803
Uniform tire quality
grading................................ 805
Tires Chains ................................... 352
Checking ............................... 672
If you have a flat tire...... 745, 747
Inflation pressure .................. 683
Information ............................ 801
Replacing .............................. 747
Rotating tires ......................... 673
Size ....................................... 794
Snow tires ............................. 352
Tire pressure warning system ........................ 672, 733
Tools ......................................... 747
Total load capacity .................. 351T