Toyota 1993 MR2 Wiring Diagrams page 17

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
Wires are always
(1) NOT
drawn as straight lines
CONNECTED
on wiring diagrams.
Crossed wires (1)
without a black dot at
the junction are not
joined; crossed wires
(2) with a black dot or
octagonal (
the junction are spliced
(2) SPLICED
(joined) connections.
Opens and
closes circuits,
thereby
stopping (1) or
allowing (2)
current flow.
) mark at
17