2018 Lexus GS450h snow chains

370
GS450h_OM_OM30G62U_(U)
6-3. Do-it-yourself maintenance
■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 wheel without the tire pressure warning valve and transmitter are used.
• If the ID code on the tire pressure warning valves and transmitters is not registered
in the tire pressure warning computer.
●Performance may be affected in the following situations.
• Near a TV tower, electric power plant, gas station, radio station, large display, air-
port or other facility that generates st rong radio waves or electrical noise
• When carrying a portable radio, cellular phone, cordless phone or other wireless
communication device
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 afte r adjusting the tire inflation pressure.
Also, make sure the tires are cold before carryi ng out initialization or tire inflation pres-
sure adjustment.
●If you have accidentally turned the power switch off during initialization, it is not neces-
sary to manually restart the in itialization again, as initialization will restart automatically
the next time the power switch is turned to ON mode.
●If you accidentally perform initialization when initialization is not necessary, adjust the
tire inflation pressure to the specified leve l when the tires are cold, and conduct initial-
ization again.
■When initialization of the tire pressure warning system has failed
Initialization can be completed in a few minutes. However, in the following cases, the set-
tings have not been recorded and the system will not operate properly. If repeated
attempts to record tire inflation pressure settings are unsuccessful, have the vehicle
inspected by your Lexus dealer.
●The initialization message is not displayed on the multi-information display when per-
forming initialization.
●After carrying out the initializat ion procedure, the tire pressure warning light blinks for 1
minute then stays on after driving for 20 minutes.

4487-2. Steps to take in an emergency
GS450h_OM_OM30G62U_(U)
Firmly tighten each wheel nut two or
three times in the order shown in the
illustration.
Tightening torque:
76 ft•lbf (103 N•m, 10.5 kgf•m)
Stow the flat tire, tire jack and all tools.
■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. 477)
■When using the compact spare tire
As the compact spare tire is not equipped wi th a tire pressure warning valve and trans-
mitter, 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 warn-
ing light comes on, the light remains on.
■When the compact spare tire is equipped
The vehicle may become 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
Install the compact spare tire on one of the front wheels of the vehicle. Perform the fol-
lowing 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.
4
5
1
2
3
WARNING
■When using the compact spare tire
●Remember that the compact spare tire provid ed is specifically designed for use with
your vehicle. Do not use your comp act spare tire on another vehicle.
●Do not use more than one compact spare tire simultaneously.
●Replace the compact spare tire with a standard tire as soon as possible.
●Avoid sudden acceleration, abrupt steering, sudden braking and shifting operations
that cause sudden engine braking.

542Alphabetical index
GS450h_OM_OM30G62U_(U)
Power door lock switch ...................124
Power switch......................................... 182
Power window switches ................. 160
Rear sunshade switch ....................... 318
Rear window and outside rear view mirror defoggers
switch....................................................293
Seat heater switches........................ 302
Seat ventilator switches ................. 302
Snow mode switch............................. 190
“SOS” button........................................329
Talk switch
*
Telephone switches*
Tilt and telescopic steering control switch ................. 153
Trunk closer switch ............................ 129
Trunk opener main switch.............. 130
Trunk opener switch ......................... 128
Vehicle-to-vehicle distance switch....................................................249
VSC OFF switch ...............................270
Window lock switch.......................... 160
Windshield wipers and washer switch .........................207
Tachometer .................................... 88, 105
Tail lights...................................................200 Light switch .......................................... 200
Replacing light bulbs ........................393
Welcome light illumination control ....................................................123 Talk switch
*
Telephone switches*
Theft deterrent system
Alarm ........................................................... 77
Immobilizer system...............................74
Tire inflation pressure.......................... 477 Maintenance data...............................477
Tire inflation pressure display function................................................ 366
Warning light .......................................406
Warning message...............................410
Tire information .................................... 484 Glossary.................................................489
Size ...........................................................486
Tire identification number .............486
Uniform Tire Quality Grading ............................................. 488
Tire pressure warning system ......... 366 Function .................................................. 366
Initializing ............................................... 367
Installing tire pressure warning valves and transmitters................ 366
Registering ID codes .......................368
Warning light .......................................406
Warning message...............................410
Tires ........................................................... 365 Chains ..................................................... 278
Checking ...............................................365
If you have a flat tire ............................ 441
Inflation pressure.................................477
Information............................................ 484
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