2006 Lexus GS430 engine

ELECTRICAL COMPONENTS
573
NOTICE
Make sure the engine and all accessories are turned
off before performing maintenance.
 When checking the battery, remove the ground cable
first and reinstall it last.
 Be careful not to cause a short circuit with tools.
 Take care no solution gets into the battery when
washing it.
If the battery is disconnected or run down
The following functions may not operate correctly when you
reconnect or replace the battery. In these cases, you should
normalize each system referring to the following pages.
Power windows (See page 59.)
 Moon roof (See page 134.)
 Variable gear ratio steering system (See page 424.)
 Intuitive parking assist (See page 380.)
Checking battery condition
Checking by indicator
G64009
Check the battery condition by the indicator color.
1
BLUE − Good condition.
2
WHITE − Charging necessary. Have the battery checked
by your Lexus dealer.
3 RED − Have the battery checked by your Lexus dealer.
NOTICE
Do not refill the battery with water.

ELECTRICAL COMPONENTS
574
BATTERY RECHARGINGPRECAUTIONS
During recharging, the battery is producing hydrogen
gas.
Therefore, before recharging:
1. If recharging with the battery installed on the vehicle, be
sure to disconnect the ground cable.
2. Make sure the power switch on the recharger is off when
connecting the charger cables to the battery and when
disconnecting them.
CAUTION
Always charge the battery in an unconfined area. Do
not charge the battery in a garage or closed room
where there is not sufficient ventilation.
 Only do a slow charge (5 A or less). Charging at a
quicker rate is dangerous. The battery may explode
causing personal injuries.
NOTICE
Never recharge the battery while the engine is running.
Also, be sure all accessories are turned off.
CHECKING AND REPLACING THE
BLADE TYPE FUSES
G64010
Left side kick panel
G64011
Right side kick panel

ELECTRICAL COMPONENTS
575
G64012
Engine compartment
G64013
Engine compartment 1
Pullout tool 2Spare fuses
G64014
Trunk
1. Turn the engine switch off and open the fuse box lid.
Determine which fuse may be causing the problem. The lid of
the fuse box shows the name of the circuit for each fuse.

ELECTRICAL COMPONENTS
577
It is a good idea to purchase a
set of spare fuses and keep them
in your vehicle for emergencies.
If the new fuse immediately blows out, there is a problem with
the electrical system. Have your Lexus dealer correct it as
soon as possible.
CAUTION
Never use a fuse with a higher amperage rating, or any
other object, in place of a fuse. This may cause
extensive damage and possibly a fire.
CHECKING THE CARTRIDGE TYPE FUSES
G64015
Engine compartment

ELECTRICAL COMPONENTS
579
ADDING WASHER FLUID
If the washer tank becomes nearly empty, add washer
fluid.
You may use plain water as washer fluid. However, in cold
areas where temperatures range below the freezing point, use
washer fluid containing antifreeze. This product is available at
your Lexus dealer and most auto parts stores. Follow the
manufacturer’s directions for how much to mix with water.
NOTICE
Do not use engine antifreeze or any other substitute
because it may damage your vehicle’s paint.
CHECKING THE HEADLIGHT AIM
G64020
 1 Beam angle gauge
(horizontal movement for high beam)
2 Beam angle gauge
(vertical movement for high beam)
3 Beam angle gauge
(vertical movement for low beam)
4 Beam angle gauge
(horizontal movement for low beam)
Before checking the headlight aim:
1. Be sure that the body around the headlight is not deformed.
2. Park the vehicle on a level spot.
3. The driver gets into the driver’s seat and puts the vehicle in
a state readying for a driving (with a full tank).
4. Bounce the vehicle several times.

BODY
593
Fuel
filler door: Do not apply water (high −pressure car wash,
for example) at or near the fuel tank inlet with the fuel filler door
opened. If the water enters the air vent, you may experience
trouble with refueling or rough engine idling.
Plastic wheel ornaments: The plastic wheel ornaments are
damaged easily by organic substances. If any organic
substances splash an ornament, be sure to wash them of f with
water and check if the ornament is damaged.
Aluminum wheels: Use only a mild soap or neutral detergent.
Plastic bumpers and side moldings: Wash carefully. Do not
scrub with abrasive cleaners. The bumper and side molding
faces are soft.
Exterior lights: Wash carefully. Do not use organic
substances or scrub them with a hard brush. This may
damage the surfaces of the lights.
Road tar: Remove with turpentine or cleaners that are marked
safe for painted surfaces.
3. Rinse thoroughly − dried soap can cause streaking. In hot
weather you may need to rinse each section right after you
wash it.
4. To prevent water spots, dry the vehicle using a clean soft
cotton towel. Do not rub or press hard − you might scratch the
paint.
NOTICE
 Do not use organic substances (gasoline, kerosene,
benzine or strong solvents), which may be toxic or
cause damage.
 Do not scrub any part of the vehicle with a hard brush,
which may cause damage.
Automatic car wash
Your vehicle may be washed in an automatic car wash, but
remember that the paint can be scratched by some types of
brushes, unfiltered washing water, or the washing process
itself. Scratching reduces paint durability and gloss, especially
on darker colors. The manager of the car wash should be able
to advise you whether the process is safe for the paint on your
vehicle.
Waxing your Lexus
Polishing and waxing is recommended to maintain the
original beauty of your Lexus’ finish.
Apply wax once a month or if the vehicle surface does not repel
water well.
1. Always wash and dry the vehicle surface before you begin
waxing, even if you are using a combined cleaner and wax.
2. Use a good quality polish and wax. If the finish has become
extremely weathered, use a car−cleaning polish, followed by
a separate wax. Carefully follow the manufacturer’s
instructions and precautions. Be sure to polish and wax the
chrome trim as well as the paint.

cm2
Maintenance procedures for the engine, chassis,
body, electrical system, and more, are clearly
explained and illustrated.
Periodic maintenance and tuneup
Periodic maintenance and tuneup helps to prevent small
problems from growing into larger ones later on. The repair
manual outlines exactly what maintenance is required and
clearly explains how to do the work yourself stepbystep.
Areas covered include such things as spark plug replacement,
valve clearance adjustment and engine oil and filter
replacement.
Where to obtain the Repair Manual
The repair manual for GS430, GS300 may be purchased from
any Lexus dealer or call the Material Distribution Center. To
purchase the repair manual, please contact your Lexus dealer
or the Material Distribution Center tollfree at
18006222033.

GAS STATION INFORMATION
Fuel selection:
Select premium unleaded gasoline with an Octane Rating
of 91 (Research Octane Number 96) or higher for optimum
engine performance. However, if such premium type
cannot be obtained, you may temporarily use unleaded
gasoline with an Octane Rating as low as 87 (Research
Octane Number 91).
 Fuel tank capacity:
71 L (18.7 gal., 15.6 lmp.gal.)
 Engine oil:
“Toyota Genuine Motor Oil” or equivalent
Oil grade: API grade SL “Energy −Conserving” or ILSAC
multigrade engine oil.
Recommend oil viscosity − SAE 5W−30 if normal
temperatures are below 38 C (100F)
Oil capacity: L (qt., lmp.qt.)
Drain and refill with filter without filter GS430 5.1 (5.4, 4.5) 4.5 (4.8, 4.0)
GS300 (2WD) 6.3 (6.6, 5.5) 5.9 (6.2, 5.1)
GS300 (4WD) 6.4 (6.7, 5.6) 6.0 (6.3, 5.2)
See page 522 for detailed information.
 Engine coolant:
Capacity: GS430 − 10.1 L (10.7 qt., 8.9 lmp.qt.)
GS300 − 9.1 L (9.6 qt., 8.0 lmp.qt.) Coolant type −
”Toyota Super Long Life Coolant” or similar
high quality ethylene glycol based non −silicate, non −amine,
non−nitrite, and non −borate coolant with long −life hybrid
organic acid technology (Coolant with long −life hybrid
organic acid technology is a combination of low phosphates
and organic acids.)
Do not use plain water alone.
For checking the engine coolant, see page 527.
 Automatic transmission:
Fluid type − “Toyota Genuine ATF WS”
See page 532 or 535 for detailed information.
 Tire information:
See page 539 through 561 for detailed information.
 Tire inflation pressure:
Tire size: GS430 − 245/40R18 93Y or P245/40R18 93V
GS300 − 225/50R17 94W or P225/50R17 93V
Tire inflation pressure:
Front 230 kPa (2.3 kgf/cm
2 or bar, 33 psi)
Rear 230 kPa (2.3 kgf/cm2 or bar, 33 psi)
For sustained high speeds above 160 km/h (100 mph), in
countries where such speeds are permitted by law, add the
tire inflation pressure given below to the front tires and rear
tires, but never exceed the maximum cold tire inflation
pressure molded on the tire sidewall.
GS430 60 kPa (0.6 kgf/cm
2 or bar, 9 psi)
GS300 50 kPa (0.5 kgf/cm2 or bar, 7 psi)