lexus LS400 1995 Air Conditioning and Audio / 1995 LS400: ELECTRICAL COMPONENTS

SECTION 6 – 4
219
SERVICE PROCEDURES AND
SPECIFICATIONS
Electrical components
Specifications220 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking battery condition224 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery recharging precautions226 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking and replacing the blade type fuses226 . . . . . . . . . . . . . . . .
Checking the cartridge type fuses 228. . . . . . . . . . . . . . . . . . . . . . . . . .
Adding washer fluid 229. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the headlight aim230 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing light bulbs231 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ELECTRICAL COMPONENTS
220
SPECIFICATIONS
− FUSE LOCATIONS

1
Engine compartment
2
Driver’s side kick panel− FUSES

Driver’s side kick panel

ELECTRICAL COMPONENTS
221

Engine compartment

ELECTRICAL COMPONENTS
222
No.FUSEAMPERECIRCUIT
1TURN10Turn signal lights
2WIPER20Windshield wipers and washer
3ECU−IG15
Power steering control
system, Shift lock system,
Power seat control system,
Anti−lock brake system,
Traction control system,
Telephone, Charging system
4FR FOG15Fog lights
5PWR−IG10
Gauges and meters, service
reminder indicators and
warning buzzers,
Power antenna
6HEATER15Air conditioning system,
Rear window defogger
7GAUGE10
Gauges and meters, service
reminder indicators and
warning buzzers,
Preset steering,
Wireless remote control
system, Back−up lights
8IGN10
SRS airbag system,
Multiport fuel injection
system / sequential multiport
fuel injection system
9FUEL
OPN15Fuel opener system
No.FUSEAMPERECIRCUIT
10RR CIG15Rear cigarette lighter,
Shift lock system
11FR CIG15
Front cigarette lighter,
SRS airbag system,
Air conditioning system, Clock
12OBD II7.5On board diagnosis
13TRAC15Traction control system
14STOP25Stop lights,
High mounted stop light
15RADIO
NO.27.5Audio system,
Outside rear view mirror
16PANEL10
Instrument panel lights,
Air conditioning system,
Glovebox light, Audio system
17STARTER7.5Starting system
18TAIL10Tail lights, Side marker lights,
License plate lights.
19STOP−S5
Shift lock system,
Height control system,
Anti−lock brake system,
Traction control system
20AIRSUS20Height control system

ELECTRICAL COMPONENTS
223
No.FUSEAMPERECIRCUIT
21DOOR20Door lock
22HORN10Horns
23RADIO
NO.120Audio system
24H−LP
R LWR10
Vehicles sold in U.S.A.
Right−hand headlight (low
beam)
25H−LP
L LWR10
Vehicles sold in U.S.A.
Left−hand headlight (low
beam)
26H−LP
L UPR20Left−hand headlight (high
beam)
27H−LP
R UPR20Right−hand headlight (high
beam)
28EFI NO.210Emission control system
29MIR HTR10Outside rear view mirror
defogger
30S / HTR20Seat heater
31ALT−S7.5Charging system
32SRS7.5SRS airbag system
33TEL15Telephone
34ANTENA10Power antenna
No.FUSEAMPERECIRCUIT
35SEC−
HORN7.5Theft deterrent system
36ECU−B15
Anti−lock brake system,
Traction control system,
Air conditioning system
37HAZ15Emergency flashers
38EFI NO.120
Multiport fuel injection
system / sequential multiport
fuel injection system
39DOME FR7.5
Front door courtesy lights,
Ignition switch light,
Foot lights, Interior light,
Vanity lights,
Wireless remote control
system, Clock
40DOME RR7.5Rear courtesy lights,
Trunk light, Audio system
41DRL10Vehicles sold in Canada
Daytime Running Light System
42H−LP
RH10Vehicles sold in Canada
Right−hand headlight
43H−LP
LH10Vehicles sold in Canada
Left−hand headlight

ELECTRICAL COMPONENTS
224
CHECKING BATTERY CONDITION
CAUTION
BATTERY PRECAUTIONS
The battery produces 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 traveling 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.

1
Terminals 2
Hold−down clamp
1. Check the battery for corroded or loose connections,
cracks, or loose hold−down clamps.

ELECTRICAL COMPONENTS
225 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.
b. If the connections are loose, tighten the clamp bolts − but
do not overtighten.
c. Tighten the hold−down clamp only enough to keep the
battery firmly in place. Overtightening may damage the battery
case.
NOTICE
Make sure the engine and all accessories are turned
off before performing maintenance.
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.2. Check the indicator as shown.
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
Your Lexus has a maintenance free battery. Do not
refill the battery with water.
In order to maintain full engine performance and to
make sure the cover fits the battery, when you
replace the battery, use an “Exide Group” battery or
equivalent performance battery. Contact your Lexus
dealer for recommendations.
Use a cover on the battery for longer life.

ELECTRICAL COMPONENTS
226
BATTERY RECHARGING
PRECAUTIONS
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, make sure all accessories are turned off.
CHECKING AND REPLACING THE
BLADE TYPE FUSES

Driver’s side kick panel

Engine compartment 1
Spare fuses 2
Pull−out tool
1. Turn the ignition switch off and open the fuse box lid.

ELECTRICAL COMPONENTS
227 Determine which fuse may be causing the problem. The lid of
the fuse box shows the name of the circuit for each fuse.
2. Make sure the inoperative component is turned off. Pull
the suspected fuse straight out with the pull−out tool and
check it. If it has blown, push a new fuse into the clips.
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.

Good
Blown
If you do not have a spare fuse, in an emergency you can pull
out the “RADIO NO.1”, “MIR HTR” or “DOME RR” 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.

ELECTRICAL COMPONENTS
228
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

1
Good 2
Melted
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.
NOTICE
Before replacing the fuses, have the cause of electrical
overload determined and repaired by your Lexus dealer.