wheel Lexus GX460 2012 Owner's Manual

696
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
The tire pressure warning system may become inoperative in the following condi-
tions:
(When the condition becomes normal, the system will work properly.)
●If electronic devices or facilities using similar radio wave frequencies are nearby.
●If a radio set at similar frequencies is in use in the vehicle.
●If a window tint that affects the radio wave signals is installed.
●If there is a lot of snow or ice on the vehicle, in particular around the wheels or
wheel housings.
●If non-genuine Lexus wheels are used. (Even if you use genuine Lexus wheels,
the tire pressure warning system may not work properly with some types of
tires.)
●If tire chains are used.
●If the spare tire is in a location subject to poor radio wave signal reception.
● If a large metallic object which can interfere with signal reception is put in the
luggage compartment.
■If the tire pressure warning light comes on after blinking for 1 minute frequently
If the tire pressure warning light comes on after blinking for 1 minute frequently
when the engine switch is turned to the “ON” position, have it checked by your
Lexus dealer.
■After changing the engine oil (U.S.A. only)
Make sure to reset the oil maintenance data. (→P. 6 1 4 )

5
When trouble arises
697
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
CAUTION
■If both the ABS and the brake system warning lights remain on
Stop your vehicle in a safe place immediately and contact your Lexus dealer. The
vehicle will become extremely unstable during braking, and the ABS system may
fail, which could cause an accident resulting in death or serious injury.
■When the power steering system warning light comes on
The steering wheel may become extremely heavy.
If the steering wheel becomes heavier than usual when operating, hold firmly and
operate using more force than usual.
■If the tire pressure warning light comes on
Be sure to observe the following precautions. Failure to do so could cause loss of
vehicle control and result in death or serious injury.
●Stop your vehicle in a safe place as soon as possible. Adjust the tire inflation pres-
sure immediately.
●If the tire pressure warning light comes on even after tire inflation pressure adjust-
ment, it is probable that you have a flat tire. Check the tires. If the tire is flat,
change to the spare tire and have the flat tire repaired by the nearest Lexus
dealer.
●Avoid abrupt maneuvering and braking. If the vehicle tires deteriorate, you could
lose control of the steering wheel or the brakes.
■If a blowout or sudden air leakage should occur
The tire pressure warning system may not activate immediately.

5
When trouble arises
699
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
CAUTION
■Maintenance of the tires
Your vehicle has also been equipped with a TPMS (tire pressure warning system)
malfunction indicator to indicate when the system is not operating properly. The
TPMS (tire pressure warning system) malfunction indicator is combined with the
low tire pressure telltale (tire pressure warning light). When the system detects a
malfunction, the telltale will flash for approximately one minute and then remain
continuously illuminated. This sequence will continue upon subsequent vehicle
start-ups as long as the malfunction exists. When the malfunction indicator is illumi-
nated, the system may not be able to detect or signal low tire pressure as intended.
TPMS (tire pressure warning system) malfunctions may occur for a variety of rea-
sons, including the installation of replacement or alternate tires or wheels on the
vehicle that prevent the TPMS (tire pressure warning system) from functioning
properly. Always check the TPMS (tire pressure warning system) malfunction tell-
tale after replacing one or more tires or wheels on your vehicle to ensure that the
replacement or alternate tires and wheels allow the TPMS (tire pressure warning
system) to continue to function properly.
NOTICE
■Precaution when installing a different tire
When a tire of a different specification or maker is installed, the tire pressure warn-
ing system may not operate properly.

5
When trouble arises
719
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
Sounds
once
(Flashes)
The steering lock
could not be
released within 3
seconds of the
“ENGINE START
STOP” switch
being pressed.
Press the
“ENGINE START
STOP” switch
while depressing
the brake pedal
and moving the
steering wheel left
and right.
InteriorbuzzerExterior buzzerWa r n i n g m e s s a g eDetailsCorrection
procedure

720
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
Other messagesIf the following message is displayed, take appropriate action and confirm
that the message has disappeared. ( →P. 328)
MessageCorrection procedure
(If equipped)
Select the four-wheel driving position switch in L4
and shift the shift lever to D or R.
(If equipped)
Confirm the operating conditions.
■Warning light display in radar cruise mode (if equipped)
In the following cases, the warning light may not be displayed even if vehicle-to-
vehicle distance decreases:
●When your vehicle and the vehicle ahead are traveling at the same speed or the
vehicle ahead is traveling more quickly than your vehicle
●When the vehicle ahead is traveling at a very low speed
●Immediately after cruise control speed is set
●At the instant the accelerator pedal is depressed
■After changing the engine oil (U.S.A. only)
Make sure to reset the oil maintenance data. ( →P. 6 1 4 )

726
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
Replacing a flat tireChock the tires.
Pry off the wheel ornament, using
the beveled end of the wheel orna-
ment remover as shown.
STEP1
Flat tireWheel chock position
FrontLeft-hand sideBehind the rear right-hand side tire
Right-hand sideBehind the rear left-hand side tire
Rear
Left-hand sideIn front of the front right-hand side tire
Right-hand sideIn front of the front left-hand side tire
STEP2

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When trouble arises
727
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)Slightly loosen the wheel nuts (one
turn).
Assembling the jack handle.
Remove the jack handle, jack handle extension bar and jack han-
dle bar from the tool box and assemble by following these steps. Loosen the bolt and the screw
using either the jack handle end
or a screwdriver.
Assemble the jack handle
extension bar and the jack han-
dle bar and tighten the bolts.
Check that the bolts are firmly
tightened.
STEP3
STEP4

5
When trouble arises
729
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)Raise the vehicle until the tire is
slightly raised off the ground.
Remove all the wheel nuts and the
tire.
When resting the tire on the
ground, place the tire so that the
wheel design faces up to avoid
scratching the wheel surface.
STEP6
STEP7

730
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
Installing the spare tireRemove any dirt or foreign matter
from the wheel contact surface.
If foreign matter is on the wheel
contact surface, the wheel nuts
may loosen while the vehicle is in
motion, and the tire may come off
the vehicle.
Install the spare tire and loosely
tighten each nut by hand to
approximately the same amount.
Turn the lug nuts until the washers
come into contact with the disc
wheel.
Lower the vehicle.
STEP1
STEP2
Wheel nut
Wa s h e r
Disc wheel
STEP3

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When trouble arises
731
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)Firmly tighten each nut two or
three times in the order shown in
the illustration.
Tightening torque:
83 ft•lbf (112 N•m, 11.4 kgf•m)
Reinstall the wheel ornament.
Stowing the flat/spare tire, jack and tools
Lay down the tire with the outer
side facing up, and install the hold-
ing bracket.
Insert the holding bracket tab into
one of the holes in the wheel.
Raise the tire.
Pull the tire towards the rear of the vehicle when raising. After
raising, visually check that the tire is not interfering with suspen-
sion components.
Stow the tools and jack securely, and replace all covers.
STEP4
STEP5
STEP1
STEP5STEP2
STEP5STEP3