Toyota ST185 Series Repair Manual page 15

Basically, an electrically
RELAY
operated switch which may
be normally closed (1) or
1. NORMALLY
open (2).
CLOSED
Current flow through a
small coil creates a
magnetic field which either
2. NORMALLY
opens or closes an
OPEN
attached switch.
RELAY, DOUBLE THROW
A relay which passes current
through one set of contacts or the
other.
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.
RESISTOR, VARIABLE or
RHEOSTAT
A controllable resistor with a
variable rate of resistance.
Also called a potentiometer or
rheostat.
SENSOR (Thermistor)
A resistor which varies its
resistance with temperature.
SENSOR, ANALOG SPEED
Uses magnetic impulses to open
and close a switch to create a
signal for activation of other
components.
SHORT PIN
Used to provide an unbroken
connection within a junction block.
SOLENOID
An electromagnetic coil which
forms a magnetic field when
current flows, to move a plunger,
etc.
SPEAKER
An electromechanical device
which creates sound waves from
current flow.
SWITCH, MANUAL
1. NORMALLY
OPEN
2. NORMALLY
CLOSED
SWITCH, DOUBLE THROW
A switch which continuously
passes current through one set
of contacts or the other.
SWITCH,
IGNITION
A key operated switch with
several positions which allow
various circuits. Particularly the
primary ignition circuit, to
become operational.
SWITCH, WIPER PARK
Automatically returns wipers to
the stop position when the wiper
switch is turned off.
TRANSISTOR
A solidstate device typically used
as an electronic relay; stops or
passes current depending on the
applied voltage at "base."
Wires are always
WIRES
drawn as straight
(1) NOT
lines on wiring
CONNECTED
diagrams. Crossed
wired (1) without a
black dot at the
junction are not
joined;
crossed wires (2)
with a black dot or
octagonal (
(2) SPLICED
mark at the junction
are spliced (joined)
connections.
Opens and
closes circuits,
thereby
stopping (1) or
allowing (2)
current flow.
)
15