Subaru 2009 IMPREZA, Service Manual

Page: 3430 / 3619

WI-11
Basic Diagnostic Procedure
WIRING SYSTEM
1. RELAY
A symbol used to indicate a relay.
2. CONNECTOR 1
The sketch of the connector indicates the one-pole
types.
3. WIRING CONNECTION
Some wiring diagrams are indicated in foldouts for
convenience. Wiring destinations are indicated
where necessary by corresponding symbols.
(When two pages are needed for clear indication)
4. FUSE NO. & RATING
The “FUSE No. & RATING” corresponds with that
used in the fuse box (main fuse box, fuse and joint
box).
5. CONNECTOR 2
• Each connector is indicated by a symbol.
• Each terminal number is indicated in the corre-
sponding wiring diagram in an abbreviated form.
• For example, terminal number “G4” refers to No. 4
terminal of connector (G: F41) shown in the connec-
tor sketch.
6. CONNECTOR SKETCH
• Each connector sketch clearly identifies the
shape and color of a connector as well as terminal
locations. Non-colored connectors are indicated in
natural color.
• When more than two types of connector number
are indicated in a connector sketch, it means that
the same type connectors are used.
7. GROUND
Each grounding point can be located easily by re-
ferring to the corresponding wiring harness.
8. DIODE
A symbol is used to indicate a diode.
9. WIRE TRACING ON EXTENDED WIRING
DIAGRAMS
For a wiring diagram extending over at least two
pages, a symbol (consisting of the same characters
with arrows), facilitates wire tracing from one page
to the next.
A
mo
A, B
mo
B
10.SYMBOLS OF WIRE CONNECTION AND
CROSSING
11.POWER SUPPLY CIRCUIT
A symbol is used to indicate the power supply in
each wiring diagram.
“MB – 5”, “MB – 6”, etc., which are used as power-
supply symbols throughout the text, correspond
with those shown in the “DC POWER SUPPLY
CIRCUIT” in the wiring diagram.
Accordingly, using the “DC POWER SUPPLY CIR-
CUIT” and wiring diagrams permits service person-
nel to understand the entire electrical arrangement
of a system.
12.CLASSIFICATION BY SPECIFICATION
When the wiring diagram differ according to vehicle
specifications, the specification difference is de-
scribed by using abbreviations.
13.TWISTED PAIR LINE
The twisted pair line is indicated by a symbol in the
wiring diagrams.
WI-02755
Symbol
Symbol Refers to wires which are
crossed but not connected.
Refers to wires which are
connected and branched
at the dot point.
WI-16199
TWISTED PAIR LINE
P
V B25
B26
V
9
P 10