HOW TO READ WIRING DIAGRAMS
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HOW TO READ WIRING DIAGRAMS
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The wiring diagram of each system is illustrated so that you
can understand the path through which electric current flows from
battery.
Sketches and codes are used in the diagrams. They should read
as follows:
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Each connector and its terminal position are indicated
by a sketch of the connector in a disconnected state which is viewed
from front.
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The number of poles or pins, presence of a lock are
indicated in the sketch of each connector. In the sketch, the highest
pole number refers to the number of poles which connector has. For
example, the sketch of connector shown in the figure indicates the
connector has 9 poles.
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When one set of connectors is viewed from the front
side, the pole numbers of one connector are symmetrical to those
of other. When these two connectors are connected as a unit, the
poles which have the same number are joined.
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WIRING DIAGRAM:
The connectors are numbered along with the number of poles,
external colors, and mating connections in accompanying list.
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The sketch of each connector in the wiring diagram usually
shows (A) side of the connector. The relationship between wire color,
terminal number and connector is described in figure.
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Note
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A wire which runs in one direction
from a connector terminal sometimes may have a different color from that
which runs in the other direction from that terminal.
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In the wiring diagram, connectors which have no terminal
number refer to one-pole types. Sketches of these connectors are
omitted intentionally.
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The following color codes are used to indicate the colors
of the wires used.
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Color
code
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Color
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L
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Blue
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B
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Black
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Y
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Yellow
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G
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Green
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R
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Red
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W
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White
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Br
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Brown
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Lg
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Light
green
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Gr
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Gray
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P
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Pink
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Or
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Orange
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Sb
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Sky
blue
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V
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Violet
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SA
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Sealed
(Inner)
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SB
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Sealed
(Outer)
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The wire color code, which consists of two letters (or
three letters including Br or Lg), indicates the standard color
(base color of the wire covering) by its first letter and stripe
marking by its second letter.
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The table lists the nominal sectional areas and allowable
currents of wires.
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Important
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When replacing or repairing a
wire, be sure to use the same size and type of wire which was originally
used.
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Note
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The allowable current in the table indicates tolerable
amperage of each wire at an ambient temperature of 40°C
(104°F).
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The allowable current changes with ambient temperature.
Also, it changes if a bundle of more than two wires is used.
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Nominal
sectional area
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No. of strands/ strand
diameter
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Outside diameter
of finished
wiring
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Allowable current Amps/
40°C (104°F)
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mm
2
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mm
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0.3
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7/0.26
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1.8
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7
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0.5
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7/0.32
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2.2
(or 2.0)
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12
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0.75
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30/0.18
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2.6
(or 2.4)
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16
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0.85
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11/0.32
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2.4
(or 2.2)
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16
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1.25
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16/0.32
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2.7
(or 2.5)
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21
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2
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26/0.32
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3.1
(or 2.9)
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28
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3
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41/0.32
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3.8
(or 3.6)
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38
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5
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65/0.32
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4.6
(or 4.4)
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51
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8
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50/0.45
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5.5
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67
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Each unit is either directly grounded to the body or
indirectly grounds through a harness ground terminal. Different
symbols are used in the wiring diagram to identify the two grounding
systems.
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The ground points shown in the wiring diagram refer
to the following:
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Note
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All wiring harnesses are provided
with a ground point which should be securely connected.
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Relays are classified as normally-open or normally-closed.
The normally-closed relay has one or more contacts. The wiring
diagram shows the relay mode when energizing circuit is OFF.
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Each connector number shown in the wiring diagram corresponds
to that in wiring harness. The location of each connector in actual
vehicle is determined by reading the first character of the connector
(for example, a “F” for F8, “i” for
i16, etc.) and type of wiring harness. The first character of each
connector number refers to the area or system of the vehicle.
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Symbol
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Wiring
harness and cord
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F
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Front
wiring harness
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B
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Bulkhead
wiring harness
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E
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Engine
wiring harness
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T
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Transmission
cord, Rear oxygen sensor cord
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D
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Door
cord LH & RH,
Rear door cord LH & RH, Rear gate cord
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i
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Instrument
panel wiring harness
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R
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Rear
wiring harness,
Fuel tank cord,
Roof cord
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AB
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Airbag
wiring harness
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