Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 795
WI-9
Basic Diagnostic Procedure
WIRING SYSTEM
• Each connector number shown in the wiring dia-
gram corresponds to that in the wiring harness. The
location of each connector in the actual vehicle is
determined by reading the first character of the
connector (for example, a “F” for F8, “i” for i16, etc.)
and the type of wiring harness. The first character
of each connector number corresponds to the area
or system of the vehicle.
Symbol
Wiring harness and cord
F
Front wiring harness
B
Bulkhead wiring harness
E
Engine wiring harness
T
Transmission cord
D
Door cord LH & RH, Rear gate cord
Rear door cord LH & RH, Rear defogger
cord
i
Instrument panel wiring harness
R
Rear wiring harness,
Fuel tank cord,
Roof cord, Rear gate cord
AB
Airbag wiring harness
F23
F98
F21
F58
F100
F5
F27
F47
F34
F19
F22
F96
WI-02753
Each connector number
shown in wiring diagram
corresponds to that in
the vehicle.
F19
FRONT TURN SIGNAL
LIGHT LH (UPPER)
BG
2
B
1
F22
FRONT TURN SIGNAL
LIGHT LH (LOWER)
BG
3
B
2
(GRAY)
F3
(GRAY)
F19
1 2
WI-10
Basic Diagnostic Procedure
WIRING SYSTEM
D: SYMBOLS IN WIRING DIAGRAMS
A number of symbols are used in each wiring diagram to easily identify parts or circuits.
WI-21328
LR
LW
RL
3
7
2
5
MAIN FUSE BOX (M/B)
MB-11
MB-10
F39
P-SUP-02
B
P-SUP-02
A
P-SUP-02
C
No
.3 10A
No
.9 15A
No
.8
15A
S
B
F
-1
1
00
A
HEAD-
LIGHT
RELAY
RH
HEAD-
LIGHT
RELAY
LH
G
P-SUP-04
D
H/L(2L)-01
RL
LW
GR
LB
MB-10
M/B FUSE NO. 8
MB-11
M/B FUSE NO. 9
FB-16
F/B FUSE NO. 11
(IG)
MB-5
HEADLIGHT
RELAY
TO POWER SUPPLY CIRCUIT
LW
4
R
3
YL
LW
R
YL
2
YB
1
RY
2
LW
2
R
1
YL
3
P
LW B1
R
A1
F44
F45
F23
F7
B61
B62
B
REF TO.
GND-02
RL
2
R
1
YL
3
B71
B112
LY
8
RY
7
YB
B
17
16
3
17
16
DIMMER &
PASSING SWITCH
UP LOW PASS
HF
HU
HL
E
SMJ
LB
H1
B36
SMJ
DIODE
R4
PARKING
BRAKE
SWITCH
LIGHTING SWITCH
OFF
HC
TC
EL
HEADLIGHT LH
LOW
HIGH
HEADLIGHT RH
LOW
HIGH
REF TO.
FOG(H4)-01
REF TO.
FOG(H6)-01
REF TO. ST(MT)-01
REF TO. ST(AT)-01
B51
A:
B52
C:
F41
G:
FB-37
D4
D7
BG
D11
A2
WR
G4
BL
G1
BR
D10
FB-35
FB-34
1
2 3
4 5 6 7
1 2
3
4 5 6 7 8
LgB
Or
FUSE &
RELAY
BOX (F/B)
i5
B:
B51
A:
B152
D:
B52
C:
B158
E:
F41
G:
F40
F:
FB-36
A3
BG
G7
No
.5
1
0
A
(GRAY)
P-SUP-03
H
P-SUP-03
F
P-SUP-04
K
P-SUP-04
J
No
.1 20A
No
.2 15A
S
B
F
-6
3
0A
LR
2
R
3
L
1
R
3
BW
2
W
S
B
F
-2
5
0A
S
B
F
-3
5
0A
S
B
F
-4
5
0A
F36
F38
F68
P-SUP-04
E
P-SUP-04
M
P-SUP-04
L
P-SUP-03
I
P-SUP-04
G
1 2 3 4
5 6 7 8
F44
B112
1 2
F23
1
2
3
(BLACK)
F7
(BLACK)
RELAY
DIODE
GROUND
SPECIFICATION
CLASSIFICATION
SPECIFICATION
CLASSIFICATION
CONNECTOR SKETCH
FUSE No. & RATING
POWER SUPPLY
ROUTING
WIRE TRACING
ON EXTENDED
WIRING DIAGRAMS
SYMBOLS OF
WIRE
CONNECTION
AND CROSSING
Example
P
P
17
R3
B99
P
P
7
R1
B97
2
LY
13 13
WR
OR
: WITHOUT REAR DEFOGGER
: WITH REAR DEFOGGER
OR
WR
WG
WG
SD
SD
: WAGON
: SEDAN
SD
WG
TWISTED PAIR LINE
CONNECTOR-1
CONNECTOR-2
2
1
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 con-
nector 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 ←→ A, B ←→ 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
WI-12
Basic Diagnostic Procedure
WIRING SYSTEM
E: CONNECTOR SYMBOL IN WIRING HARNESS
A number of connector symbols are used in each wiring diagram to easily identify the wiring harness con-
nectors.
WI-02756
Standard type: Female
Standard type: Male
Water proof type: Female
Water proof type: Male
Pole: From 1 to 8
Pole: From 9 to 20
Pole: More than 21
Pole: From 1 to 8
Pole: From 9 to 20
Pole: More than 21
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