2003 Lexus ES300 fuses

INTRODUCTION
300
Checking brake fluid
Parts (if level is low):
FMVSS No. 116 DOT 3 or SAE J1703 brake fluid
Tools:
 Funnel (only for adding fluid)
Checking power steering fluid
Parts (if level is low):
Automatic transmission fluid DEXRON
II or III
Tools:
 Rag or paper towel
 Funnel (only for adding fluid)
Checking battery condition
Tools:
Warm water
 Baking soda
 Grease
 Conventional wrench (for terminal clamp bolts)
Checking and replacing the blade type fuses
Parts (if replacement is necessary):
Fuse with same amperage rating as original
Checking the cartridge type fuses
Parts (if replacement is necessary):
Genuine Lexus fuse or equivalent with same amperage
rating as original
Adding washer fluid
Parts:
Water
 Washer fluid containing antifreeze (for winter use)
Tools:
 Funnel

SECTION 6 – 4
334
SERVICE PROCEDURES AND
SPECIFICATIONS
Electrical components
Specifications335
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Checking battery condition 341
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Battery recharging precautions 344
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Checking and replacing the blade type fuses 344
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Checking the cartridge type fuses 347
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Adding washer fluid 348
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Checking the headlight aim 349
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Replacing light bulbs 350
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ELECTRICAL COMPONENTS
335
SPECIFICATIONS
FUSE LOCATIONS
64E092
 1 2 Engine compartment
3 Driver’s side instrument panel FUSES
64E119
1
Engine compartment

ELECTRICAL COMPONENTS
337
No.FUSEAMPERECIRCUIT
1 ABS NO.47.5
Anti−lock brake system,
vehicle skid control system,
traction control system, brake
assist system
2 A/F25Multiport fuel injection
system/sequential multiport
fuel injection system
3 DOOR125
Multiplex communication
system (power door lock
system, auto −door locking
system, wireless remote
control system)
4 TEL5No circuit
5 AM230All components in “IGN” and
“IG2” fuses and starting system
6 EFI20Multiport fuel injection
system/sequential multiport
fuel injection system
7 ALTS5Charging system
8 HEAD LH
UPR10Left −hand headlight (high
beam)
No.FUSEAMPERECIRCUIT
9 ETCS10Multiport fuel injection
system/sequential multiport
fuel injection system
10 HORN10Horns
11 IGN15Starting system
12 HEAD RH
UPR10Right −hand headlight (high
beam)
13 HAZ15Emergency flashers
14 D.C.C30All components in “ECU− B”,
“RAD NO.1” and “DOME” fuses
15 IG210
Multiport fuel injection
system/sequential multiport
fuel injection system, SRS
airbag system, front seat belt
pretensioners, cruise control
system
16 ST5Starting system
17 ADJ PDL30Power adjustable pedals
18 CDS30Electric cooling fan

ELECTRICAL COMPONENTS
338
No.FUSEAMPERECIRCUIT
19 ABS NO.240
Anti−lock brake system,
vehicle skid control system,
traction control system, brake
assist system
20 MAIN40
All components in “HEAD LH
LWR”, “HEAD RH LWR”, “HEAD
LH UPR”, “HEAD RH UPR” and
“DRL” fuses
21 ABS NO.340
Anti −lock brake system,
vehicle skid control system,
traction control system, brake
assist system
22 HTR50Air conditioning system
23 RDI30Electric cooling fan
24 SPARE5Spare fuse
25 SPARE10Spare fuse
26 ABS NO.160
All components in “RDI FAN”,
“ABS NO.2”, “ABS NO.3”,
“CDS”, “HTR (50 A)” and “ADJ
PDL” fuses and anti −lock brake
system, vehicle skid control
system, traction control
system, brake assist system
No.FUSEAMPERECIRCUIT
27 ALT120
All components in “DEF”, “PWR
NO.1”, “PWR NO.2”, “PWR
NO.3”, “PWR NO.4”, “STOP”,
“DOOR NO.2”, “OBD”, “PWR
SEAT”, “FUEL OPEN”, “FOG”,
“AMP”, “PANEL”, “TAIL”,
“AM1”, “CIG”, “POWER
POINT”, “RAD NO.2”,
“ECU− ACC”, “GAUGE1”,
“GAUGE2”, “ECU− IG”,
“WIPER”, “WASHER”, “HTR
(10 A)”, “SEAT HTR” and
“SUN− SHADE” fuses
28 SPARE15Spare fuse
29 A/C10Air conditioning system
30 DRL5Daytime running light system
31 HEAD RH
LW R15Right −hand headlight (low
beam)
32 HEAD LH
LW R15Left −hand headlight (low
beam) and front fog lights

ELECTRICAL COMPONENTS
344
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
Engine compartment
Engine compartment 1
Pullout tool 2Spare fuses

ELECTRICAL COMPONENTS
346
Good Blown
a. Look carefully at the fuse. If the thin wire is broken, the fuse
has blown. If you are not sure or if it is too dark to see, try
replacing the suspected fuse with one of the same value that
you know is good.
b. Only install a fuse with the amperage rating designated on
the fuse box lid.
If you do not have a spare fuse, in an emergency you can pull
out the “RAD NO.1”, “RAD NO.2” or “POWER POINT” fuse,
which may be dispensable for normal driving, and use it if its
amperage rating is the same.
If you cannot use one of the same amperage, use one lower
than, but as close as possible to, the amperage. If the
amperage is lower than that specified, the fuse might blow out
again but this does not indicate anything wrong. Be sure to get
the correct fuse as soon as possible and return the substitute
to its original clips. 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.

ELECTRICAL COMPONENTS
347
CHECKING THE CARTRIDGE TYPEFUSES
Engine compartment
Driver’s side instrument panel
If the headlights or other electrical components do not
work and the blade type fuses are O.K., check the
cartridge type fuses. If any of the cartridge type fuses are
blown, they must be replaced.
If there is an overload in the circuits from the battery, the fuses
are designed to blow before the entire wiring harness is
damaged.
CAUTION
Always use a genuine Lexus fuse or equivalent for
replacement. Never install an ordinary wire even for
a temporary fix. This may cause extensive damage and
possibly a fire.