Lexus ES300 (1997 year). Manual - part 608

ABBREVIATIONS D

15

ABBREVIATIONS

T

he following abbreviations are used in this manual.

ABS

= 

Anti–Lock Brake System

A/C

=

Air Conditioning

ACIS

=

Acoustic Control Induction System

A/T

=

Automatic Transaxle

CD

=

Compact Disc

COMB.

=

Combination

ECU

=

Electronic Control Unit

EGR

=

Exhaust Gas Recirculation

ESA

=

Electronic Spark Advance

EVAP

=

Evaporative Emission

FL

=

Fusible Link

J/B

=

Junction  Block

LH

=

Left–Hand

O/D

=

Overdrive

R/B

=

Relay Block

RH

=

Right–Hand

SFI

=

Sequential Multiport Fuel Injection

SRS

=

Supplemental Restraint System

SW

=

Switch

TEMP.

=

Temperature

TRAC

=

Traction Control

VSV

=

Vacuum Switching Valve

w/

=

With

w/o

=

Without

*

The titles given inside the components are the names of the terminals (terminal codes) and are
not treated as being abbreviations.

16

E  GLOSSARY OF TERMS AND SYMBOLS

METER, ANALOG

Current flow activates a magnetic
coil which causes a needle to
move, thereby providing a relative
display against a background
calibration.

LED (LIGHT EMITTING DIODE)

Upon current flow, these diodes
emit light without producing the
heat of a comparable light.

IGNITION COIL

Convert low–voltage DC current
into high–voltage ingition current
for firing the spark plugs.

1.

SINGLE
FILAMENT

GROUND

The point at which wiring attaches
to the Body, thereby providing a
return path for an electrical circuit;
without a ground, current cannot
flow.

Current flow causes a headlight
filament to heat up and emit light.
A headlight may have either a 
single (1) filament or a double (2)  
filament.

BATTERY

Stores chemical energy and 
converts it into electrical energy.
Provides DC current for the 
auto’s various electrical circuits.

CAPACITOR (Condenser)

A small holding unit for temporary
storage of electrical voltage.

CIRCUIT BREAKER

Basically a reusable fuse, a circuit
breaker will heat and open if too
much current flows through it.
Some units automatically reset when
cool, others must be manually reset.

DIODE

A semiconductor which allows
current flow in only one direction.

DIODE, ZENER

A diode which allows current 
flow in one direction but blocks
reverse flow only up to a specific
voltage. Above that potential, it
passes the excess voltage.  
This acts as a simple voltage 
regulator.

PHOTODIODE

The photodiode is a 
semiconductor which controls the
current flow according to the
amount of light.

FUSE

A thin metal strip which burns
through when too much current
flows through it, thereby stop–
ping current flow and protecting a 
circuit from damage.

FUSIBLE LINK

A heavy–gauge wire placed in
high amperage circuits which
burns through on overloads,
thereby protecting the circuit.
The numbers indicate the cross–
section surface area of the wires.

HORN

An electric device which sounds a 
loud audible signal.

LIGHT

Current flow through a filament
causes the filament to heat up 
and emit light. 

METER, DIGITAL

Current flow activates one or
many LED’s, LCD’s, or fluoresent
displays, which provide a relative
or digital display.

MOTOR

A power unit which converts
electrical energy into mechanical
energy, especially rotary motion.

CIGARETTE LIGHTER

An electric resistance heating
element.

DISTRIBUTOR, IIA

Channels high–voltage current
from the ignition coil to the
individual spark plugs.

2.

DOUBLE
FILAMENT

HEADLIGHTS

FUEL

M

 

(for High Current Fuse or

Fusible Link.)

(for Medium Current Fuse)

17

  E

1.

NORMALLY
OPEN

Open and
closes circuits,
thereby
stopping (1) or
allowing (2)
current flow.

RESISTOR

An electrical component with a
fixed resistance, placed in a circuit
to reduce voltage to a specific
value.

RESISTOR, TAPPED

A resistor which supplies two or
more different non adjustable
resistance values.

SENSOR (Thermistor)

A resistor which varies its
resistance with temperature.

SHORT PIN

Used to provide an unbroken
connection within a juction block.

SOLENOID

An electromagnetic coil which
forms a magnetic field when
current flows, to move a plunger,
etc.

SWITCH, DOUBLE THROW

A switch which continuously
passes cureent through one set of
contacts or the other.

SWITCH,
IGNITION

A key operated switch with several
positions which allows various
circuits, particularly the primary
ignition circuit, to become
operational.

Wires are always 
drawn as straight lines
on wiring diagrams.
Crossed wires (1)
without a black dot at
the junction are not
joined;
crossed wires (2) and
a black dot or
octagonal (

   

) mark at 

the  juction as spliced
(joined) connections.

RELAY, DOUBLE THROW

A relay which passes current
through one set of contacts or the
other.

SENSOR, SPEED

Uses magnetic impulses to open
and close a switch to create a 
signal for activation of other
components.

TRANSISTOR

A solid state device typically used
as an electronic relay; stops or
passes current depending on the
voltage applied at “base.”

SWITCH, WIPER PARK

Automatically returns wipers to
the stop position when the wiper
switch is turned off.

SWITCH, MANUAL

SPEAKER

An electromechanical device
which creates sound waves from
current flow.

2.

NORMALLY
CLOSED

RESISTOR, VARIABLE or
RHEOSTAT

A controllable resistor with a 
variable rate of resistance.
Also called a potentiometer or
rheostat.

2.

NORMALLY
OPEN

RELAY

1.

NORMALLY
CLOSED

Basically, an electrically
operated switch which
may be normally closed
(1) or open (2). Current
flow through a small
coil creates a magnetic
field which either opens
or closes an attached
switch.

(2) SPLICED

WIRES

(1) NOT

CONNECTED

18

+

F  RELAY LOCATIONS

[Engine Compartment]

[Instrument Panel]