1999 Lexus GS300 Electrical Components

ELECTRICAL COMPONENTS
437
37 TEL15No circuit
38 TURN±HAZ10Turn signal lights
No.FUSEAMPERECIRCUIT
39 EFI25
Multiport fuel injection
system/sequential multiport fuel
injection system, Emission
control system
40 ALT±S5Charging system
41 RADIO
NO.120Audio
42 DRL NO.230Vehicles with daytime
running light system:
Daytime running light system
43 H±LP L
UPR10
Vehicles without daytime
running light system:
Left±hand headlight (high
beam)
44
H±LP R
UPR10
Vehicles without daytime
running light system:
Right±hand headlight (high
beam)
44
DRL NO.130Vehicles with daytime
running light system:
Daytime running light system
45 H±LP L
LW R15Left±hand headlight (low beam)
46 H±LP R
LW R15Right±hand headlight (low
beam)

ELECTRICAL COMPONENTS
438
47 H±LP R
UPR15
Vehicles with daytime
running light system:
Right±hand headlight (high
beam)
No.FUSEAMPERECIRCUIT
48 H±LP L
UPR15
Vehicles with daytime
running light system:
Left±hand headlight (high
beam)
SPARESpare fuse

ELECTRICAL COMPONENTS
439
CHECKING BATTERY
CONDITION
Precautions

ELECTRICAL COMPONENTS
440
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.

ELECTRICAL COMPONENTS
441
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.Checking battery exterior
64G001a

ELECTRICAL COMPONENTS
442

1Terminals 2Hold±down clamp
Check the battery for corroded or loose
connections, cracks, or loose hold±down clamps.
1. 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.
2. If the connections are loose, tighten the clamp bolts
± but do not overtighten.
3. 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.
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.
Checking battery fluid
There are 2 types of batteries: maintenance type
and non±maintenance type.
A non±maintenance battery has ºMAINTENANCE
FREE BATTERYº on its top. A maintenance type battery
does not have such indication.
Maintenance type battery
Check the fluid condition by the fluid level lines on the
side of the battery. Or if the battery has a hydrometer on
its top, you can also check the hydrometer.
Non±maintenance battery
Check the battery condition by the hydrometer on the top
of the battery.

ELECTRICAL COMPONENTS
443 (a) Checking by the fluid level lines (Maintenance
type battery only)
64G002b

1Upper line 2Lower line
The fluid (electrolyte) level must be between the
upper and lower lines.
When checking the fluid level, look at all six cells, not just
one or two.
If the level is lower than the lower line, add distilled water.
(See ºAdding distilled waterº on page 444.)(b) Checking by the hydrometer

ELECTRICAL COMPONENTS
444
64G003a
Check the battery condition by the hydrometer
color.
Maintenance type battery
1
BLUE ± Good condition.
2
WHITE ± Charging necessary. Have the battery
checked by your Lexus dealer.
3
RED ± Add distilled water. (See ºAdding distilled
waterº described below.)
Non±maintenance type battery
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
For non±maintenance battery:
Do not refill the battery with water.
Adding distilled water
(Maintenance type battery only)