light lexus LS400 1994 Engine / 1994 LS400: ELECTRICAL COMPONENTS

SECTION 6 – 4
217
SERVICE PROCEDURES AND
SPECIFICATIONS
Electrical components
Specifications218 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking battery condition and fluid level222 . . . . . . . . . . . . . . . . . . .
Battery recharging precautions224 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking and replacing the blade type fuses224 . . . . . . . . . . . . . . . .
Checking the circuit breakers226 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the cartridge type fuses226 . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the windshield wiper blades227 . . . . . . . . . . . . . . . . . . . . . .
Adding washer fluid230 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing light bulbs231 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ELECTRICAL COMPONENTS
220
NO.FUSEAMPERECIRCUIT
1STOP25Stop lights, cruise control
system cancel device
2FOG15Fog lights
3ECU-B15
SRS, Lexus ride control system,
anti-lock brake system, cruise
control system
4RADIO7.5
Radio, cassette tape player,
compact disc player, power
antenna, power rear view
mirrors, air conditioning system
5CIG15Cigarette lighter, theft deterrent
system, shift lock system, SRS
6MIR-HTR10Outside rear view mirror
defogger
7GAUGE10
Gauges and meters, service
reminder indicators and warning
buzzers (except discharge and
open door warning lights),
back-up lights, electronically
controlled automatic transmission
system, automatic transmission
overdrive system, power
windows, seat belt warning lights
8ENGINE7.5Charging system
NO.FUSEAMPERECIRCUIT
9ECU-IG15
Cruise control system, power
steering control system, shift lock
system, anti-lock brake system,
power door lock system, Lexus
ride control system, automatic
light control system
10TURN7.5Turn signal lights
11HEATER15
Air conditioning system, rear
window defogger, electronic
cooling fan system
12WIP20Windshield wipers and
washer, headlight cleaner
13TAIL15
Tail lights, parking lights,
side marker lights, license
plate lights
14PANEL7.5
Instrument panel lights, air
conditioning control system,
clock, instrument panel lights,
glovebox light for light system
15IGN10
Discharge warning light,
sequential rnultiport fuel
injection system, electronic
cooling fan system, SRS
16ST7.5
Starting system, cruise
control system, multiport
fuel injection system,
instrument panel lights
17TRAC15Traction control system

ELECTRICAL COMPONENTS
221
NO.FUSEAMPERECIRCUIT
18RADIO
NO. 120Radio, cassette tape player,
compact disc player, power antenna
19HAZ-HORN15Emergency flashers, horns
20DOME10
Interior light, personal lights, door
courtesy lights, ignition switch light,
open door warning light, trunk
room light, electric moon roof
system, radio cassette tape player,
compact disc player, preset
steering system, seat belt warning
system, air conditioning system,
inside rear view mirror, door lock
and theft deterrent system foot
light, power rear view mirror,
locking, with wireless remote
control system, automatic light
control system
21TEL15Telephone
22EFI20Multiport fuel injection system
23SEAT HTR20Seat heater
24AIRSUS20Lexus ride control system, height
control system
25DRL10Vehicles sold in Canada
Daytime Running Light System
26
HEAD LH15Vehicles sold in U.S.A.
Left-hand headlight
HEAD
LH-LWR10Vehicles sold in Canada
Left-hand headlight (low beam)
NO.FUSEAMPERECIRCUIT
27
HEAD RH15Vehicles sold in U.S.A.
Right-hand headlight
HEAD
RH-LWR10Vehicles sold in Canada
Right-hand headlight (low beam)
28HEAD
LH-UPR15Vehicles sold in Canada
Left-hand headlight (high beam)
29HEAD
RH-UPR15Vehicles sold in Canada
Right-hand headlight (high beam)
NO.CIRCUIT
BREAKERAMPERECIRCUIT
30P/W30
Preset steering, power shoulder
anchor, electric moon roof, power
windows
31DOOR30
Theft deterrent system, seat
control system, fuel opener
control system
32DEFOG40Rear window defogger

ELECTRICAL COMPONENTS
222
CHECKING BATTERY CONDITION
AND FLUID LEVEL
CAUTION:
BATTERY PRECAUTIONS
The battery produces a flammable and explosive
hydrogen gas.

Do not cause a spark by contacting the battery
terminals with tools.

Do not smoke or light a match near the battery.
The electrolyte contains poisonous and corrosive sulfuric
acid.

Avoid contact with eyes, skin or clothes.

Never inhale or swallow electrolyte.

Wear protective safety glasses when working near the
battery.

Keep children away from the battery.
EMERGENCY MEASURES

If electrolyte gets in your eyes, flush your eyes with
clean water for at least 15 minutes and get immediate
medical attention. If possible, continue to apply water
with a sponge or cloth while en route to the medical
office.
If electrolyte gets on your skin, thoroughly wash the
contacted area. If you feel a pain or burn, get medical
attention immediately.

If electrolyte gets on your clothes, there is a possibility
of its soaking through to your skin, so immediately take
off the exposed clothing and follow the procedure
above, if necessary.

If you happen to swallow electrolyte, drink a large
quantity of water or milk. Follow with milk of magnesia,
beaten raw egg or vegetable oil. Then go immediately
for emergency help.
Extended maintenance
interval batteryHold-down clamp
Terminals
1. Check the battery for corroded or loose connections,
cracks, or loose hold-down clamps.
a. If the battery is corroded, wash it off with a solution of warm
water and baking soda. Coat the terminals with grease to
prevent further corrosion.

ELECTRICAL COMPONENTS
226
CHECKING THE CIRCUIT
BREAKERS
Driver’s side
kick panel
Circuit breakers
In the event the defogger, air conditioning, power
windows, power door locks, or moon roof does not
operate, check its circuit breaker (C
.B).
To reset the circuit breaker, first turn the ignition switch off and
carefully insert a thin object, such as a toothpick, needle or
safety pin, into the hole in the circuit breaker and push until you
hear a click. The component should now operate. This may be
done without removing the circuit breaker.
If the circuit breaker immediately goes off again or the
component does not operate, turn off the component switch
and have the electrical system checked by your Lexus dealer
as soon as possible.
CHECKING THE CARTRIDGE TYPE
FUSES
GoodMelted
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
melted, they must be replaced.
If there is an overload in the circuits from the battery, the fuses
are designed to melt before the entire wiring harness is
damaged.
NOTICE:
Before replacing the fuses, have the cause of electrical
overload determined and repaired by your Lexus dealer.
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.

ELECTRICAL COMPONENTS
231
REPLACING LIGHT BULBS
The illustration on the following pages show the locations of
light bulbs. If it is necessary to replace a bulb, take your vehicle
to your Lexus dealer as soon as possible. Use bulbs with the
bulb numbers and wattage ratings given in the table.
CAUTION:
Halogen bulbs have pressurized gas inside and require
special handling. They can burst or scatter if scratched or
dropped. Hold a bulb only by its plastic or metal case. Do
not touch the glass part of a bulb with bare hands.
NOTICE:
Only use a bulb of the listed type.
Light BulbsBulb No.WType
HeadlightsHB260 / 55A
Fog lightsH355B
Parking lights—5D
Front side marker lights1943.8D
Front turn signal lights115627C
Rear turn signal lights115627C
Stop and tail lights115727 / 8C
Back-up lights115627C
High mounted stoplight92118D
License plate lights—5D
Light BulbsBulb No.WType
Interior light—10F
Personal lights—8C
Glovebox light—1.2D
Door courtesy lights1943.8D
Footlights—1.4D
Vanity lights—3E
Trunk light1943.8D
A : HB2 halogen bulbs
B : H3 halogen bulbs
C : Single end bulbs
D : Wedge base bulbs
E : Double end bulbs

ELECTRICAL COMPONENTS
Parking lights
Headlight
Fog light
Front turn
signal lightsFront side marker
lightsRear turn signal, stop and tail,
and back-up lights
License plate lights
High mounted stoplight
232LIGHT LOCATION

ELECTRICAL COMPONENTS
233
Front personal light
Glovebox light
FootlightDoor courtesy lights
Trunk light