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LX570_OM_OM60R61U_(U)6-3. Do-it-yourself maintenance
■Tire types
●Summer tires
Summer tires are high-speed performance ti
res best suited to highway driving under
dry conditions. Since summer tires do not have the same traction performance as
snow tires, summer tires are inadequate for driving on snow-covered or icy roads. For
driving on snow-covered roads or icy road s, 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 adequate for
driving in most winter conditions, as well as for use year round. All season tires, how-
ever, do not have adequate traction perfor mance compared with snow tires in heavy
or loose snow. Also, all season tires fall short in acceleration and handling perfor-
mance 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 ti res of the same size, construction and load capacity as the
originally installed tires. Since your vehicle has radial tires as original equipment, make
sure your snow tires also have radial cons truction. Do not install studded tires without
first checking local regulations for possible re striction. Snow tires should be installed
on all wheels. ( P. 389)
■Initializing the tire pressure warning system
Initialize the tire pressure warn ing system with the tire inflation pressure adjusted to the
specified level.
■If the tread on snow tires wears down below 0.16 in. (4 mm)
The effectiveness of the tire s as snow tires is lost.
■If you press the tire pressure warning reset switch accidentally
If initialization is performed, adjust the tire inflation pressure to the specified level and ini-
tialize the tire pressure warning system again.
■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.
• An auxiliary-supported run-flat tire is equipped.
• If a window tint that affects th e radio wave signals is installed.
• If there is a lot of snow or ice on the vehi cle, particularly around the wheels or wheel
housings.
• If the tire inflation pressure is extr emely higher than the specified level.
• If the spare tire is in a location subj ect to poor radio wave signal reception.
• If a large metallic object which can interfere with signal reception is put near the spare tire.
• If tires not equipped with the tire pressure warning valves and transmitters are used.
• If the ID code on the tire pressure warning valves and transmitters is not registered in the tire pressure warning computer.
631Alphabetical index
LX570_OM_OM60R61U_(U)
Rear window wiper and washer switch................................... 242
Rear window and outside rear view mirror defoggers
switch..................................................... 413
Seat heater switches......................... 423
Seat ventilator switches .................. 423
“SOS” button........................................... 74
Talk switch
*
Telephone switches*
Tilt and telescopic steering control switch .................................... 164
Tire pressure warning reset switch....................................................492
Vehicle-to-vehicle distance button ...................................................282
VSC OFF switch .............................. 385
Window lock switch............................ 171
Windshield wipers and washer switch.................................. 238
Wireless charger power supply switch ....................................443
Tachometer ............................................... 92
Tail lights................................................... 228 Light switch ...........................................228
Replacing light bulbs ......................... 512
Talk switch
*
Telephone switch*
Theft deterrent system Alarm........................................................... 82
Immobilizer system ............................. 80 Tire inflation pressure........................... 571
Maintenance data................................ 571
Warning light ....................................... 527
Tire information .....................................575 Glossary.................................................. 581
Size ........................................................... 577
Tire identification number ............. 576
Uniform Tire Quality Grading.... 579
Tire pressure warning system ........... 491 Function ....................................................491
Initializing .................................................491
Installing tire pressure warning valves and transmitters..................491
Registering ID codes ....................... 492
Tire pressure warning reset switch ................................................... 492
Warning light ....................................... 527
Tires ........................................................... 490 Chains .....................................................390
Checking ...............................................490
If you have a flat tire .......................... 537
Inflation pressure................................ 499
Replacing ............................................... 537
Rotating tires ........................................490
Size ............................................................. 571
Snow tires ..............................................389
Spare tire...................................... 537, 571
Tire pressure warning system .......491
Warning light ....................................... 527
Tools ...........................................................537
Total load capacity............................... 564
T
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL”.
