2013 Lexus GS350 snow chains

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GS350_U (OM30C34U)
6-3. Do-it-yourself maintenance
■Low profile tires (except 225/50R17 tires)
Generally, low profile tires will wear more rapidly and tire grip performance will be
reduced on snowy and/or icy roads when compared to standard tires. Be sure to use
snow tires or tire chains
* on snowy and/or icy roads and drive carefully at a speed
appropriate for road and weather conditions.
*: Tire chains cannot be used on vehicles with front and rear tires of differing sizes
and vehicles equipped with LDH and 19-inch tires. Snow tires should be used
instead.
■Maximum load of tire
Check that the maximum load of the replacement tire is greater than 1 /2 of the
Gross Axle Weight Ratings (GAWR) of either the front axle or the rear axle, which-
ever is greater.
■Tire types
●Summer tires
Summer tires are high-speed performance tires best suited to highway driving
under dry conditions. Since summer tires do not have the same traction perfor-
mance as snow tires, summer tires are inadequate for driving on snow-covered or
icy roads. For driving on snow-covered roads or icy roads, the use of snow tires is
recommended. When installing snow tires, be sure to replace all four tires.
●All season tires
All season tires are designed to provide better traction in snow and to be ade-
quate for driving in most winter conditions as well as for use year-round. All season
tires, however, do not have adequate traction performance compared with snow
tires in heavy or loose snow. Also, all season tires fall short in acceleration and han-
dling performance compared with summer tires in highway driving.
●Snow tires
For driving on snow-covered roads or icy roads, we recommend using snow tires.
If you need snow tires, select tires of the same size, construction and load capacity
as the originally installed tires. Since your vehicle has radial tires as original equip-
ment, make sure your snow tires also have radial construction. Do not install stud-
ded tires without first checking local regulations for possible restrictions. Snow
tires should be installed on all wheels. ( →P. 2 9 8 )
For the GAWR, see the Certification Label.
For the maximum load of the tire, see the load
limit at maximum cold tire inflation pressure
mentioned on the sidewall of the tire.
(
→ P. 76 5 )

GS350_U (OM30C34U)
6356-3. Do-it-yourself maintenance
6
Maintenance and care
■If the tread on snow tires wears down below 0.16 in. (4 mm)
The effectiveness of the tires as snow tires is lost.
■Situations in which the tire pressure warning system may not operate properly
●In the following cases, the tire pressure warning system may not operate properly.
• If non-genuine Lexus wheels are used.
• A tire has been replaced with a tire that is not an OE (Original Equipment) tire.
• A tire has been replaced with a tire that is not of the specified size.
• Tire chains etc. are equipped.
• Lock nuts are equipped.
• An auxiliary-supported run-flat tire is equipped.
• If a window tint that affects the radio wave signals is installed.
• If there is a lot of snow or ice on the vehicle, particularly around the wheels or wheel housings.
• If the tire inflation pressure is extremely higher than the specified level.
●Performance may be affected in the following situations.
• Near a TV tower, electric power plant, gas station, radio station, large display, airport or other facility that generates strong radio waves or electrical noise
• When carrying a portable radio, cellular phone, cordless phone or other wire- less communication device
Vehicles with the tire inflation pressure display function: If tire position information
is not correctly displayed due to the radio wave conditions, the display may be
corrected by driving and changing the radio wave conditions.
●When the vehicle is parked, the time taken for the warning to start or go off could
be extended.
●When tire inflation pressure declines rapidly for example when a tire has burst, the
warning may not function.
■The initialization operation
●Make sure to carry out initialization after adjusting the tire inflation pressure.
Also, make sure the tires are cold before carrying out initialization or tire inflation
pressure adjustment.
●If you have accidentally turned the engine switch off during initialization, it is not
necessary to press the reset switch again as initialization will restart automatically
when the engine switch has been turned to IGNITION ON mode for the next time.
●If you accidentally press the reset switch when initialization is not necessary, adjust
the tire inflation pressure to the specified level when the tires are cold, and conduct
initialization again.

7327-2. Steps to take in an emergency
GS350_U (OM30C34U)
■The compact spare tire
●The compact spare tire is identified by the label “TEMPORARY USE ONLY” on
the tire sidewall.
Use the compact spare tire temporarily, and only in an emergency.
●Make sure to check the tire inflation pressure of the compact spare tire.
(→ P. 7 5 9 )
■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 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 equipped
The vehicle becomes lower when driving with the compact spare tire compared to
when driving with standard tires.
■If you have a flat rear tire on a road covered with snow or ice (vehicles with front
and rear tires of the same size)
Install the compact spare tire on one of the front wheels of the vehicle. Perform the
following steps and fit tire chains to the rear tires:
Replace a front tire with the compact spare tire.
Replace the flat rear tire with the tire removed from the front of the vehicle.
Fit tire chains to the rear tires.
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823Alphabetical index
GS350_U (OM30C34U)
Tachometer ....................................... 79, 92
Tail lights.................................................... 190Light switch ............................................ 190
Replacing light bulbs ..........................671
Welcome light illumination
control .....................................................101
Talk switch
*............................................ 334
Telephone switches
*.......................... 486
Theft deterrent system
Alarm........................................................... 70
Engine immobilizer system ..............68
Tire inflation pressure ......................... 759 Maintenance data ..............................759
Tire inflation pressure display function .................................................. 85
Warning light ...................................... 690
Warning message ...............................713
Tire information ..................................... 765 Glossary ................................................. 772
Size ........................................................... 768
Tire identification number.............. 767
Uniform Tire Quality Grading...............................................770
Tire pressure warning system ...........631 Function ................................................... 631
Initializing ................................................. 631
Installing tire pressure warning
valves and transmitters ................. 631
Registering ID codes .......................633
Tire pressure warning reset switch.................................................... 632
Warning light ...................................... 690
Warning message .....................713, 714 Tires ............................................................629
Chains .................................................... 300
Checking ............................................... 629
If you have a flat tire ...........................722
Inflation pressure................................ 759
Information............................................ 765
Replacing ................................................722
Rotating tires ........................................630
Size ........................................................... 759
Snow tires .............................................. 302
Spare tire.................................................722
Tire inflation pressure display
function................................................... 85
Tire pressure warning system .......631
Warning light ...................................... 690
Warning message............................... 713
Tools ...........................................................723
Top tether strap ........................................64
Total load capacity.................................168
Towing Dinghy towing .......................................170
Emergency towing ........................... 678
Towing eyelet ...................................... 679
Trailer towing.........................................169
TRAC (Traction Control)................. 268
Transmission ............................................ 178 Automatic transmission ....................178
Driving mode select switch .......... 263
If the shift lever cannot be shifted from P ....................................737
M mode ..................................................... 181
Paddle shift switches......................... 180
Trip information ....................................... 83
Trip meters.................................................. 79
T
*: For vehicles with a navigation system, refer to the “Navigation System Owner’s Manual”.