2008 Lexus GS450h Do-it-yourself maintenance / LEXUS 2008 GS450H OWNER'S MANUAL (OM30A96U)

5
When trouble arises
521
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
Turn the tire jack portion “A” by
hand until the notch of the jack is in
contact with the jack point.
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.
STEP3
STEP4
STEP5

522
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
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 wheel nut by hand to
approximately the same amount.
Tighten the wheel nuts until the
tapered portion comes into loose
contact with the disc wheel sheet.
Lower the vehicle.
STEP1
STEP2
Disc wheel 
sheet
Tapered portion
STEP3

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When trouble arises
523
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
Firmly tighten each 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.
STEP4
■If you have a flat rear tire on a road covered with snow or ice
Install the compact spare tire on the front of the vehicle. Perform the following 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 vehi-
cle.
Fit tire chains to the rear tires.
■After completing the tire change
The tire pressure warning system must be reset. ( P. 4 3 6 )
STEP5
STEP1
STEP2
STEP3

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5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
CAUTION
■Using the tire jack
Improper use of the tire jack may lead to death or injuries due to the vehicle sud-
denly falling off the jack.
●Do not use the tire jack for any purpose other than replacing tires or installing and
removing tire chains.
●Only use the tire jack that comes with this vehicle for replacing a flat tire. 
Do not use it on other vehicles, and do no t use other tire jacks for replacing tires
on this vehicle.
●Always check that the tire jack is securely set to the jack point.
●Do not raise the vehicle while someone is in it.
●When raising the vehicle, do not put an object on or under the jack.
●Do not raise the vehicle to a height greate r than that required to replace the tire.
●Use a jack stand if it is necessary to get under the vehicle.
●Do not put any part of your body under the vehicle supported by a jack.
●Do not start or run the hybrid system while your vehicle is supported by the jack.
Take particular care when lowering the vehicle to ensure that no one working on or
near the vehicle may be injured.
■Replacing a flat tire
Observe the following precautions to reduce the risk of death or serious injury.
●Never use oil or grease on the wheel bolts or wheel nuts. 
The oil or grease can cause the wheel nuts to loosen, causing a serious accident.
Remove any oil or grease on the wheel bolts or wheel nuts.
●Have the wheel nuts tightened with a torque wrench to 76 ft•lbf (103 N•m, 10.5
kgf•m) as soon as possible after changing wheels. 
Failure to follow these precautions could cause the nuts to loosen and the wheels
may fall off, which could lead to an accident causing death or serious injury.

5
When trouble arises
525
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
CAUTION
■When using the compact spare tire
●Remember that your spare tire is specifically designed for use with your vehicle.
Do not use your spare tire on another vehicle.
●Do not use two spare tires simultaneously.
●Replace the spare tire with a standard tire as soon as possible.
●Avoid sudden acceleration, deceleration and braking, as well as sharp cornering.
■Speed limit when using the compact spare tire
Do not drive at speeds in excess of 50 mph (80 km/h) when a compact spare tire is
installed on the vehicle.
The compact spare tire is not designed for driving at high speeds. Failing to observe
this precaution may lead to an accident causing death or serious injury.

526
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
NOTICE
■Do not drive the vehicle with a flat tire
Do not continue driving with a flat tire.
Driving even a short distance with a flat tire can damage the tire and the wheel
beyond repair.
■Be careful when driving over bumps with the compact spare tire installed on the
vehicle
The vehicle becomes lower when driving with the compact spare tire compared to
when driving with standard tires. Be careful when driving over uneven road sur-
faces.
■Driving with tire chains and the compact spare tire
Do not fit tire chains to the compact spare tire. 
Tire chains may damage the vehicle body and adversely affect driving performance.
■When replacing the tires
When removing or fitting the wheels, tire s or the tire pressure warning valve and
transmitter, contact your Lexus dealer as the tire pressure warning valve and trans-
mitter may be damaged if not handled correctly.
■To avoid damaging the tire pressu re warning valves and transmitters
Do not use liquid sealants on flat tires.

5
When trouble arises
527
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
If you have a flat tire (Vehicles with run-flat tires)
■In some condition (such as at high temperatures)
You can not continue driving for up to 100 miles (160 km).
■If you cannot distinguish between th e standard tires and run-flat tires
Consult your Lexus dealer.
■For the detailed information on run-flat tires
See the tire warranty book.
NOTICE
■When replacing the tires
Have the tires replaced by the nearest Lexus dealer or authorized tire dealer. The
tire pressure warning valves and transmitters will be affected by the installation or
removal of tires.
■To avoid damaging the tire pressu re warning valves and transmitters
Do not use liquid sealants on flat tires.
Take your vehicle to the nearest Lexus dealer or authorized tire dealer as
soon as possible.
■ Run-flat tires (A “RFT” or “DSST” mark is molded on the sidewall)
You can continue driving a vehi-
cle with run-flat tires even if any
tire goes flat.
It is able to run for a maximum of
100 miles (160 km) at a speed
below 55 mph (90 km/h) after
the tire pressure warning light
comes on. (P. 4 9 3 )

528
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
If the hybrid system will not start
If the hybrid system will not start even though correct starting procedures
are being followed (
P. 138), consider each of the following points.
■The hybrid system will not start ev en if you are carrying the cor-
rect electronic key
One of the following may be the cause of the problem.
● The electronic key battery may be discharged. ( P. 5 3 1 )
● There may not be sufficient fuel in the vehicle’s tank. 
Add fuel to the vehicle.
● There may be a malfunction in the steering lock system.
● There may be a malfunction in the immobilizer system. 
( P. 88)
■ The interior lights and headlights are dim, or the horn does not
sound or sounds at a low volume
One of the following may be the cause of the problem.
● The 12 volt battery may be discharged. ( P. 5 3 4 )
● The 12 volt battery terminal connections may be loose or cor-
roded.
■ The interior lights and headlights do not turn on, or the horn does
not sound
One of the following may be the cause of the problem.
●One or both of the 12 volt battery terminals may be discon-
nected.
● The 12 volt battery may be discharged. ( P. 5 3 4 )
Contact your Lexus dealer if the problem cannot be repaired, or if
repair procedures are unknown.