2008 Lexus GS450h service

450
4-3. Do-it-yourself maintenance
GS_HV_U
December 27, 2007 1:38 pm
■When replacing wheels
The wheels of your Lexus are equipped with tire pressure warning valves and trans-
mitters that allow the tire pressure warning system to provide advanced warning in
the event of a loss in tire inflation pressure. Whenever wheels are replaced, the tire
pressure warning valves and transmitters must be installed. ( P. 4 3 6 )
CAUTION
■When replacing wheels
●Do not use wheels that are a different size from those recommended in the
Owner’s Manual, as this may result in loss of handling control.
●Never use an inner tube in a leaking wheel which is designed for a tubeless tire.
Doing so may result in an accident, causing death or serious injury.
NOTICE
■Replacing tire pressure warning valves and transmitters
●Because tire repair or replacement may affect the tire pressure warning valves
and transmitters, make sure to have tires serviced by your Lexus dealer or other
qualified service shop. In addition, make sure to purchase your tire pressure
warning valves and transmitters at your Lexus dealer.
●Ensure that only genuine Lexus wheels are used on your vehicle. 
Tire pressure warning valves and transmitters may not work properly with non-
genuine wheels.

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GS_HV_U
December 12, 2007 3:50 pm
5-1. Essential information
If your vehicle needs to be towed
Before towingThe following may indicate a problem with your transmission. Contact
your Lexus dealer before towing.
● The hybrid system is running, but the vehicle will not move.
● The vehicle makes an abnormal sound.
Emergency towing
If a tow truck is not available, in an emergency your vehicle may be tem-
porarily towed using a cable or ch ain secured to the emergency towing
eyelet. This should only attempted on hard, surfaced roads for short dis-
tances below 18 mph (30 km/h). 
A driver must be in the vehicle to s teer and operate the brakes. The vehi-
cle’s wheels, drive train, axles, steering and brakes must be in good condi-
tion.
If towing is necessary, we recommen d having your vehicle towed by your
Lexus dealer or a commercial towing service, using a lift-type truck or a flat
bed truck. 
Use a safety chain system for all towing , and abide by all state/provincial
and local laws.
If towing from the rear, the wheels and axle on the ground must be in good
condition.
If they are damaged, use a to wing dolly or flat bed truck.

555
6-1. Specifications
6
Vehicle specifications
GS_HV_U
December 12, 2007 3:50 pm
■Lexus does not recommend gasoline containing MMT
Some gasoline contains octane enhancin g additive called MMT (Methylcy clopen-
tadienyl Manganese Tricarbonyl).
Lexus DOES NOT recommend the use of gasoline that contains MMT. If fuel con-
taining MMT is used, your emission control system may be adversely affected.
The malfunction indicator lamp on the inst rument cluster may come on. If this hap-
pens, contact your Lexus dealer for service.
NOTICE
■Notice on gasoline quality
●Do not use leaded gasoline. 
Leaded gasoline can cause damage to your vehicle’s three-way catalytic convert-
ers causing the emission control system to malfunction.
●Do not use gasohol other than that stated here. 
Other gasohol may cause fuel system damage or vehicle performance problems.
●Using unleaded gasoline with an octane number or rating lower than that stated
here will cause persistent heavy knocking. 
At worst, this will lead to engine damage.
■Fuel-related poor driveability
If after using a different type of fuel, poor driveability is encountered (poor hot start-
ing, vaporization, engine knoc king, etc.), discontinue the use of that type of fuel.
■When refueling with gasohole
Take care not to spill gasohol. It can damage your vehicle’s paint.

561
6-1. Specifications
6
Vehicle specifications
GS_HV_U
December 12, 2007 3:50 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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Alphabetical index
GS_HV_U
December 12, 2007 3:50 pm
Parking brake .......................................... 147
Parking lightsReplacing light bulbs ........................474
Switch ....................................................... 158
Wattage ................................................. 552
Personal lights ....................................... 354
Power meter ............................................148
Power outlet ........................................... 368
Power windows......................................... 77
Pre-collision system ............................ 206
Radar cruise control ............................. 169
Radiator.................................................... 428
Radio ..........................................................244
Radio data system.................................246
Rear sunshade........................................372
Rear turn signal lights Replacing light bulbs ........................474
Wattage ................................................. 552
Rear view monitor system .................. 195
Rear window defogger ...................... 240
Replacing Electronic key battery ..................... 454
Fuses ........................................................ 456
Light bulbs .............................................474
Reporting safety defects for 
U.S. owners ......................................... 578
Seat belts Adjusting the seat belt ....................... 66
Automatic locking retractor............ 68
Child restraint system 
installation .............................................. 117
Cleaning and maintaining 
the seat belts..................................... 406 Emergency locking retractor..........68
How to wear your seat belt .............66
How your child should wear

the seat belt ..........................................69
Pre-collision seat belts .......................68
Pregnant women, 
proper seat belt use .........................68
Reminder light .....................................493
Seat belt extenders ..............................69
Seat belt pretensioners ...................... 67
Seat heaters/ventilators..................... 370
Seating capacity ....................................369
Seats Adjustment .............................................. 58
Adjustment precautions ....................59
Child seats/child restraint 
system installation.............................. 117
Cleaning ................................................ 405
Driver’s seat position memory .......60
Head restraint ......................................... 64
Properly sitting in the seat ................ 93
Seat heaters ......................................... 369
Service reminder indicators ............. 152
Shift lever If the shift lever cannot be 
shifted from P ...................................529
Transmission...........................................142
Shift lock system ....................................529
Shopping bag hooks............................ 375
Side airbags................................................ 95
Side marker lights Switch........................................................ 158
Side mirror Adjusting and folding.......................... 75
Mirror position memory ....................60P
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