warning Lexus GS350 2008 Do-it-yourself maintenance / LEXUS 2008 GS460/350 (OM30A87U) Repair Manual

506
5-2. Steps to take in an emergency
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May 13, 2008 5:14 pm
Wa r n i n g m e s s a g eDetailsCorrection procedure
(Flashing)
(If equipped)
The radar cruise control
system is unable to judge
vehicle-to-vehicle dis-
tance.
• Turn the mode select switch to either the nor-
mal or power mode.
• If the windshield wipers are on, turn them off or
set them to either the
intermittent or the slow
mode.
(If equipped, flashing)
Yo u r v e h i c l e i s n e a r i n g
the vehicle ahead (in
radar cruise mode).Slow the vehicle by apply-
ing the brakes.
■After changing the engine oil (U.S.A. only)
Make sure to reset the oil maintenance data. ( P. 4 1 2 )
■Approach warning message
In the following instances, there is the poss ibility that the approach warning will not
activate even when the 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 very low speed.
●Immediately after cruise control speed is set.
●At the instant the accelerator pedal is depressed.

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5-2. Steps to take in an emergency
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May 13, 2008 5:14 pm
Have the malfunction repaired immediately.After taking the specified steps to correct the suspected problem, check
that the warning message and light turn off.
InteriorbuzzerExterior buzzerWa r n i n g m e s s a g eDetailsCorrection procedure
Once(Comes on for 10 seconds.)
(Flashing)
The electronic key
is not detected
when attempting
to start the
engine.Confirm the
location of
the elec-
tronic key.
Once3 times
(Flashing)
An open door
other than the
driver’s door is
closed while the
electronic key is
outside the detec-
tion range and the
“ENGINE START
STOP” switch is in
ACCESSORY or
IGNITION ON
mode.
Confirm the
location of
the elec-
tronic key.

5
When trouble arises
513
5-2. Steps to take in an emergency
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May 13, 2008 5:14 pm
■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 only in an emergency.
●Make sure to check the tire inflatio n pressure of the compact spare tire. 
(  P. 5 5 0 )
■Tr e a d l i f e
The compact spare tire can be used many times, if necessary. It has tread life of up
to 3000 miles (4800 km) depending on road conditions and your driving habits.
When treadwear indicato rs appear on the tire, replace the tire. ( P. 4 2 1 )
■When using the compact spare tire
As the spare tire is not equipped with the tire pressure warning valve and transmit-
ter, low inflation pressure of the spare tire will not be warned. Also, if you replace the
compact spare tire after the tire pressure warning light comes on, the light remains
on.
■ Compact spare tire
The compact tire saves space in your luggage compartment, and its
lighter weight helps to enhance fuel economy and permits easier
installation in case of a flat tire.
The compact spare tire is
designed for temporary emer-
gency use only.

518
5-2. Steps to take in an emergency
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May 13, 2008 5:14 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 2 2 )
STEP5
STEP1
STEP2
STEP3

5
When trouble arises
521
5-2. Steps to take in an emergency
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May 13, 2008 5:14 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.

522
5-2. Steps to take in an emergency
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May 13, 2008 5:14 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 0 )

5
When trouble arises
531
5-2. Steps to take in an emergency
GS_G_U
May 13, 2008 5:14 pm
■Starting the engine when the 12 volt battery is discharged
The engine cannot be started by push-starting.
■To prevent 12 volt battery discharge
●Turn off the headlights and the audio system while the engine is turned off.
●Turn off any unnecessary electrical compon ents when the vehicle is running at a
low speed for an extended period, such as in heavy traffic, etc.
■When the 12 volt battery is removed or discharged
The following systems must be initialized.
●Tire pressure warning system (P. 4 2 2 )
●Intuitive parking assist (P. 5 0 7 )
CAUTION
■Avoiding battery fires or explosions
Observe the following precautions to prevent accidentally igniting the flammable
gas that may be emitted from the battery.
●Make sure the jumper cable is connected to the correct terminal and that it is not
unintentionally in contact with any pa rt other than the intended terminal.
●Do not allow the jumper cables to come into contact with the “+” and “-” termi-
nals.
●Do not allow open flame or use matches, cigarette lighters or smoke near the
battery.
Maintain the engine speed on th e second vehicle and turn the
“ENGINE START STOP” switch to the IGNITION ON mode,
then start the vehicle’s engine.
Once the vehicle’s engine ha s started, remove the jumper
cables in the exact reverse ord er in which they were con-
nected.
Once the engine starts, have the ve hicle checked at your Lexus dealer
as soon as possible.STEP5
STEP6

561
6-1. Specifications
6
Vehicle specifications
GS_G_U
May 13, 2008 5:14 pm
■DOT quality grades
All passenger vehicle tires must co nform to Federal Safety Require-
ments in addition to these grades. Quality grades can be found where
applicable on the tire sidewall between tread shoulder and maximum
section width.
For example: Treadwear 200 Traction AA Temperature A
■ Treadwear
The treadwear grade is a comparative rating based on the wear rate of
the tire when tested under controll ed conditions on a specified gov-
ernment test course.
For example, a tire graded 150 would wear one and a half (1 - 1 /2) times as
well on the government course as a tire graded 100. 
The relative performance of tires de pends upon the actual conditions of
their use, however, and may depart significantly from the norm due to varia-
tions in driving habits, service practices and differences in road characteris-
tics and climate.
■ Traction AA, A, B, C
The traction grades, from highest to lowest, are AA, A, B and C, and
they represent the tire’s ability to stop on wet pavement as measured
under controlled condit ions on specified government test surfaces of
asphalt and concrete.
A tire marked C may have poor traction performance.
Warning: The traction grade assigned to this tire is based on braking
(straight ahead) traction tests and does not include cornering (turning) trac-
tion.

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6-1. Specifications
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May 13, 2008 5:14 pm
■Temperature A, B, C
The temperature grades are A (the highest), B, and C, representing
the tire’s resistance to the generation of heat and its ability to dissipate
heat when tested under controlled conditions on a specified indoor
laboratory test wheel.
Sustained high temperature can cause the material of the tire to degenerate
and reduce tire life, and excessive temperature can lead to sudden tire fail-
ure.
The grade C corresponds to a level of performance which all passenger car
tires must meet under the Federal Mo tor Vehicle Safety Standard No. 109.
Grades B and A represent higher levels of performance on the laboratory
test wheel than the minimum required by law.
Warning: The temperature grades for this tire are established for a tire that
is properly inflated and not overloaded. 
Excessive speed, underinflation, or excess ive loading, either separately or in
combination, can cause heat buildup and possible tire failure.
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation pres-
sureTire pressure when the vehicle has been parked for
three hours or more, or has not been driven more
than 1 mile or 1.5 km under that condition
Maximum inflation pres-
sureThe maximum cold inflated pressure to which a tire
may be inflated, shown on the sidewall of the tire
Recommended inflation
pressureCold tire inflation pressure recommended by a man-
ufacturer

575
6
Vehicle specifications
GS_G_U
May 13, 2008 5:14 pm
6-3. Initialization
Items to initialize
ItemWhen to initializeReference
Intuitive parking assist
• After reconnecting or changing the battery
• After changing a fuse
P. 5 0 7
Engine oil maintenance
data• After changing engine oilP. 4 1 2
Tire pressure warning
system
• When rotating the tires on vehicles differing with front and rear tire infla-
tion pressures.
• When changing the tire inflation pressure by changing traveling speed
or load weight, etc.
• When changing the tire size.
P. 4 2 3
After reconnecting or performing main tenance on the 12 volt battery, the
following items must be initialized for normal system operation.