1992 Lexus ES300 ECU

ELECTRICAL COMPONENTS
Passenger’s side kick panel
192
NO.FUSEAMPERECIRCUIT
1ECU-IG15
Cruise control system, power
steering control system, shift
lock system, anti-lock brake
system. SRS airbag system,
power door lock and theft
deterrent system, power
antenna, telephone, electronic
cooling fan system.
2GAUGE10
Gauges and meters warning
lights and buzzers (except
discharge and open door
warning lights), back-up
lights, electronically,
controlled automatic
transmission system,
automatic transmission
overdrive system, rear
window and outside rear
view mirror defogger
3STOP25
Stop lights, cruise control
system cancel device, shift
lock system, anti-lock brake
system
4SEAT
HTR15Seat heater
5WIPER20Windshield wipers and
washer, headlight cleaner

ELECTRICAL COMPONENTS
193
NO.FUSEAMPERECIRCUIT
6TURN7.5Turn signal lights
7IGN7.5
Electronic fuel injection
system, electronic cooling fan
system, SRS airbag system
8CIG/
RADIO15
Radio, cassette tape player,
compact disc player, power
antenna, power rear view
mirrors, cigarette lighter,
theft deterrent system, shift
lock system, SRS airbag
system, clock
9MIR-HTR10Outside rear view mirror defogger
10TAIL15Tail lights, parking lights
11ECU-B15
SRS airbag system, anti-lock
brake system, daytime
running light system
12FOG15Fog lights
13AM140Ignition system
14P/W30Electronic moon roof, power
windows
15DEF40Rear window and outside
rear view mirror defogger
NO.FUSEAMPERECIRCUIT
16STARTER10Starting system, electronic fuel
injection system
17ALT-S7.5Charging system
18EFI15Electronic fuel injection system
19HEAD
(RH) HI15
Vehicles sold in the U.S.A.
Right-hand headlight
Vehicles sold in Canada
Right-hand headlight
(high beam)
20DOME20
Radio, cassette tape player,
compact disc player, power
antenna, interior light,
personal lights, door courtesy
lights, ignition switch light,
trunk room light, electronic
moon roof system,
instrument panel lights, door
lock and theft deterrent
system, locking with wireless
remote control system
21HAZ-
HORN15Emergency flashers, horns
22HEAD
(LH) HI15
Vehicles sold in the U.S.A.
Left-hand headlight
Vehicles sold in Canada
Left-hand headlight
(high beam)

ELECTRICAL COMPONENTS
Terminals
Extended maintenance
interval batteryHold - down clamp
Red
White
Blue
Indicator
Vent plug
Electrolyte (clear fluid)
must be between
upper and lower lines
195
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. 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.
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:

Be sure the engine and all accessories are off before
performing maintenance.

Remove the ground cable first and reinstall last.

Be careful not to cause a short circuit with tools.
2. Check the indicator as shown.
RED − Add distilled water
WHITE − Charging necessary.
BLUE − Good condition.
If the indicator is red, check the electrolyte level as shown.
a. When checking the electrolyte level, look at all six cells, not
just one or two.
b. Remove the vent plugs and replenish the battery with
distilled water.
c. After replenishing, be sure to securely retighten the vent
plugs.