4967-3. Do-it-yourself maintenance
RC350/RCF_U (OM24636U)
■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.
• If tires not equipped with 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.
●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 th at generates strong 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 correctl y 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 af ter adjusting the tire inflation pressure.
Also, make sure the tires are cold before carry ing 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 press the reset switch again as init ialization will restart automatically when the
engine switch has been turned to IG NITION 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 co ld, 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.
●When operating the tire pressure warning reset switch, the tire pressure warning light
does not blink 3 times.
●After carrying out the initialization procedure, the tire pressure warning light blinks for 1
minute then stays on after driving for 20 minutes.
5718-2. Steps to take in an emergency
8
When trouble arises
RC350/RCF_U (OM24636U)
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
●RC350: The spare tire is identified 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 inflation pressure of the spare tire.
( P. 6 1 4 )
■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 becomes lower when driving with the 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 except for ve hicles with 235/40R19 tires and LDH system)
Install the 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 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
680Alphabetical index
RC350/RCF_U (OM24636U)
Tachometer .......................................90, 96Variable red zone................................. 101
Tail lights...................................................208 Light switch .......................................... 208
Replacing light bulbs ......................... 519
Talk switch
*............................................388
Telephone switches
*..........................388
Theft deterrent system Alarm........................................................... 78
Engine immobilizer system.............. 76
Luggage security system .................142
Theft prevention labels ...................... 80
Tire inflation pressure .........................500 Maintenance data ............................... 614
Tire inflation pressure display function ................................................492
Warning light ...................................... 535
Tire information ..................................... 623 Glossary ................................................ 630
Size ............................................................626
Tire identification number..............625
Uniform Tire Quality Grading.............................................. 628 Tire pressure warning system ..........492
Initializing ............................................... 492
Installing tire pressure warning valves and transmitters................ 492
Registering ID codes ....................... 493
Tire pressure warning reset switch ................................................... 493
Warning light .......................................535
Tires ............................................................. 491 Chains .......................................................316
Checking .................................................491
Emergency tire puncture repair kit .............................................. 574
If you have a flat tire ............. 560, 574
Inflation pressure..................................614
Information............................................ 623
Replacing .............................................. 560
Rotating tires ..........................................491
Size .............................................................614
Snow tires ................................................ 317
Spare tire............................................... 560
Tire inflation pressure display function................................................ 492
Tire pressure warning system ..... 492
Warning light .......................................535
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