engine LEXUS LS430 2006 Repair Manual

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4-3. Do-it-yourself maintenance
Engine coolant
The coolant level is satisfactory if it is between the “FULL” and “LOW” lines on
the reservoir when the engine is cold.
Reservoir cap
Full line
Low line
If the level is on or below the
“LOW” line, add coolant up to the
“Full” line.
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■If the coolant level drops within a short time after replenishing
Visually check the radiator, hoses, engine c
oolant filler cap, radiator cap and drain
cock and water pump. If you cannot find a leak, have your Lexus dealer test the cap
pressure and check for leaks in the cooling system.
■Coolant type selection
Use of improper coolants may dama ge y
our engine cooling system.
Only use “Toyota Super Long Life Coolant” or similar hig
h quality ethylene glycol
based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life
hybrid organic acid technology. (Coolant wi th long-life hybrid organic acid technol-
ogy is a combination of low phosphates and organic acids.)
For the USA : “Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50% di
stilled or deionized water. (Protects to: -35 C (-31F))
For Canada : “Toyota Super Long Life Coolant” is a mixture of 55% coolant and 4
5% distilled or deionized water. (Protects to: -42 C (-44F))
Please contact your Lexus dealer for further details.

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4-3. Do-it-yourself maintenance
4
Maintenance and care
Radiator and condenser
Check the radiator and condenser and clear any foreign objects. If the parts are
extremely dirty or you are not sure of their condition, have your vehicle checked
by your Lexus dealer.
CAUTION
■When the engine is hot
Do not remove the radiator cap. The cooling system may be under pressure and
ma

y spray hot coolant if the cap is removed, causing burns or other injuries.
Do not touch the radiator or condenser, as they may be not and may cause burns.
NOTICE
■When adding engine coolant
Do not use plain water alone.
■If you spill coolant:
Be sure to wash it off with water to prevent damage to parts or point.

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4-3. Do-it-yourself maintenance
Power steering fluid
■Fluid level
The fluid level should be within the
appropriate range.
Full line when cold
Add fluid if at or below line
when cold.
Full line when hot
Add fluid if at or below line
when hot.
Hot : If the vehicle has been driven around 50 mph (80 km/h) for 20 min -
utes (slightly longer in frigid te mper
atures), the fluid is hot (140F -
175
F or 60C - 80C).
Cold : If the engine has not been run for about
five hours, the fluid is cold.
(about room temperature, 50
F - 85F or 10C - 30C).
■ Checking the fluid level
Make sure to check the fluid type and prepare the necessary items before
checking.
Clean all dirt off the reservoir.
Remove the reservoir cap by tu rning it counter
clockwise and
wipe the dipstick clean.
Reinstall the reservoir cap.
Remove the reservoir cap again and look at the fluid le
vel.
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Fluid typeAutomatic transmission fluid DEXRON II or III
ItemsRag or paper towel and funnel (only for adding fluid)

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4-3. Do-it-yourself maintenance
CAUTION
■How to recharge the battery
Only perform a slow charge (5 A or less). T
he battery may explode if charged at a
quicker rate.
NOTICE
■When recharging the battery
Never recharge the battery while the engine is running. Also, be sure all accesso -
ries are turned off.

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4-3. Do-it-yourself maintenance
4
Maintenance and care
Washer fluid
Add washer fluid if “Low Washer Fluid” appears on the multi-information dis-
play. ( P.334 )
■Adding fluid
Add washer fluid until it approaches
the NORMAL (maximum) line.
NOTICE
■Use washer fluid only
Do not use soapy water or engine anti-freeze instead of washer fluid. 
Doing so may result in streaking the vehicle’s painted surface.
■Diluting washer fluid
Dilute washer fluid with water as necessary. 
Refer to the freezing temperatures listed on the washer fluid tank when diluting
wa
sher fluid.

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4-3. Do-it-yourself maintenance
Blade fuses
If a light does not turn on or if any of the electrical components do not operate,
a fuse may have blown. If this happens check and replace the fuses as neces
-
sary. 
If after replacing the fuse the light stil l
does not illuminate, the bulb may need
replacing.
Turn the ignition switch to the LOCK position.
Open the fuse box cover.
Fuse box inside the engine compartment
Push the tabs in and lift the lid off.
Fuse box inside the driver’s side
kick panel
Pull the tab and remove the lid.

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4-3. Do-it-yourself maintenance
Fuse layout and amperage rating
■Engine compartment fuse box (with electronically modulated air
suspension)
Determining if it fuse has blown.
Blown fuse
Replace it with one of an appropri -
ate amperage rating. The amper -
age rating can be found on the fuse
bo
x lid.
Normal fuse
If the lights do not turn on even
after the fuse has been replaced, a
bulb may need replacement.
(
P.313)
If the replaced fuse blows again, have the vehicle inspected by your Lexus
dealer
.
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4-3. Do-it-yourself maintenance
■Engine compartment fuse box (with out electronically modulated air
suspension)
FuseAmpereCircuit
ABS 250Vehicle stability control system
HEATER50Air conditioning system
ABS 130Vehicle stability control system
DEFOG40Rear window defogger
AIR SUS40Electronically modulated air suspension
system
FA N50Air conditioning system
R/B60
All components in "FR FOG", "TAIL",
"WASHER", "FR IG", "WIP", "H-LP CRN",
and "A/C IG"
FA N80Air conditioning system
D-J/B80
All components in "TI &TE", "DP/SEAT",
"A/C" "OBD", "STOP", "AM1", "MPX-IG",
"ABS-IG", "GAUGE", "AIRSUS", "D S/
HTR", "SECURITY", "PANEL", "D B/
ANC", "POWER OUTLET", "D-CIG", "D
RR-IG" and "D-ACC"
A LT140Charging system
P-J / B80
All components in "RR DOOR RH", "RR
DOOR LH", "D DOOR", "H-LP LVL", "P
DOOR", "P S/HTR", "P-IG", "P-ACC", "P
B/ANC", "P-CIG", "TEL" and "P RR-IG"
B AT T30All components in "RADIO NO.1", "AM2",
"HAZ" and "STR LOCK"
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4-3. Do-it-yourself maintenance
4
Maintenance and care
■Engine compartment fuse box
FuseAmpereCircuit
ST30Starting system
D/C CUT20All components in "DOME", "MPX-B1",
and "MPS-B3"
A LT- S5Charging system
FuseAmpereCircuit
H-LP R LWR15Right-hand headlight (low beam)
H-LP L LWR15Left-hand headlight (low beam)
EFI NO.27. 5Multiport fuel injection system/sequential
multiport fuel injection system
S TA7. 5Multiport fuel injection system/sequential
multiport fuel injection system
INJ10Multiport fuel injection system/sequential
multiport fuel injection system
IGN7. 5Multiport fuel injection system/sequential
multiport fuel injection system
FR IG7. 5
Electric cooling fan, Headlight cleaner,
Charging system, Starting system, Rear
window defogger
A/C IG7. 5Air conditioning system
WIP30Windshield wiper
A/C15Fog lights
WA S H E R20Windshield washer
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4-3. Do-it-yourself maintenance
4
Maintenance and care
■Fuse box in the front passenger’s side kick panel
FuseAmpereCircuit
MPX-IG7. 5
Tilt and telescopic steering, Power door
lock system, Power seat system, Engine
immobilizer system
D S/HTR15Seat heater, Climate control seat system
AIR SUS20Electronically modula ted air suspension
system
D-ACC7. 5Shift lock system, Theft deterrent system
PWR OUTLET15Power outlet
D-CIG15Rear cigarette lighter
OBD7. 5On-board diagnosis system
AM17. 5Starting system
ABS-IG7. 5Vehicle stability control system
D B/ANC5Seat belts
SECURITY7. 5Theft deterrent system
A/C7. 5Air conditioning system
STO P5Stop lights
D RR-IG10Refreshing seat
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