2019 Lexus GS F snow chains

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GS F_OM_OM30G90U_(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 engine swit ch off during initialization, it is not neces-
sary to manually restart the in itialization again, as initialization will restart automatically
the next time the engine switch is turned to IGNITION 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.

4817-2. Steps to take in an emergency
GS F_OM_OM30G90U_(U)
7
When trouble arises
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 spare tire
●GS350/GS300: The spare tire is identifi ed by the label “TEMPORARY USE ONLY”
on the tire sidewall.
●Use the spare tire temporarily , and only in an emergency.
●Make sure to check the tire inflat ion pressure of the spare tire. (P. 528)
■When using the spare tire
As the 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 sys-
tem. Also, if you replace the spare tire after the tire pressure warning light comes on, the
light remains on.
■When the spare tire is equipped
The vehicle may become lower when driving with the spare tire compared to when driv-
ing 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 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
WARNING
■When using the spare tire
●Remember that the spare tire provided is specifically designed for use with your vehi-
cle. Do not use your spare tire on another vehicle.
●Do not use more than one spare tire simultaneously.
●Replace the spare tire with a stan dard tire as soon as possible.
●Avoid sudden acceleration, abrupt steering, sudden braking and shifting operations
that cause sudden engine braking.
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595Alphabetical index
GS F_OM_OM30G90U_(U)
Tachometer ....................................... 87, 94Variable red zone................................. 97
Tail lights.....................................................216 Light switch ............................................ 216
Replacing light bulbs ........................420
Welcome light illumination control ................................................... 138
Talk switch
*
Telephone switches*
Theft deterrent system Alarm........................................................... 74
Engine immobilizer system.............. 72
Tire inflation pressure ......................... 528 Maintenance data ............................. 528
Tire inflation pressure display function ................................................394
Warning light .......................................436
Warning message .............................. 441
Tire information ..................................... 535 Glossary ................................................ 540
Size ............................................................537
Tire identification number..............537
Uniform Tire Quality Grading.............................................. 539
Tire pressure warning system ......... 394 Function ..................................................394
Initializing............................................... 395
Installing tire pressure warning valves and transmitters ................394
Registering ID codes ...................... 396
Warning light .......................................436
Warning message .............................. 441 Tires ........................................................... 393
Chains ..................................................... 299
Checking ............................................... 393
Emergency tire puncture repair kit ..............................................483
If you have a flat tire .............. 472, 483
Inflation pressure................................528
Information............................................535
Replacing ................................................472
Rotating tires ........................................ 394
Size ...........................................................528
Snow tires ............................................... 301
Spare tire.................................................472
Tire inflation pressure display function................................................ 394
Tire pressure warning system ..... 394
Warning light ....................................... 436
Warning message............................... 441
Tools ...........................................................473
Top tether strap ....................................... 68
Torque Vectoring Differential (TVD) ......................................................287
Total load capacity................................. 194
Towing Dinghy towing .......................................196
Emergency towing ........................... 426
Towing eyelet ...................................... 428
Trailer towing.........................................195
TRAC (Traction Control) Function .................................................. 289
TRAC OFF switch .............................. 291
T
*: Refer to the “NAVIGATION AND MULTIMEDIA SYSTEM OWNER’S MANUAL”.