Subaru Legacy III (2000-2003 year). Manual - part 1014

WI-10

WIRING SYSTEM

BASIC DIAGNOSTICS PROCEDURE

D: SYMBOLS IN WIRING DIAGRAMS

A number of symbols are used in each wiring diagram to easily identify parts or circuits.

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 (as
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 “C2” refers to No.
2 terminal of connector (C: F41) shown in the con-
nector sketch.

WI-01088

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

SBF-1 100A

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 ROUTING

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 10A

(GRAY)

P-SUP-03

H

P-SUP-03

F

P-SUP-04

K

P-SUP-04

J

No.1 20A

No.2 15A

SBF-6 30A

LR

2

R

3

L

1

R

3

BW

2

W

SBF-2 50A

SBF-3 50A

SBF-4 50A

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

CLASSIFICATION
OF SPECIFICATIONS

CLASSIFICATION
OF SPECIFICATIONS

CONNECTOR-1

CONNECTOR-2

CONNECTOR
SKETCH

FUSE No. & RATING

POWER SUPPLY
ROUTING

SMJ

WIRE TRACING
ON EXTENDED
WIRING DIAGRAMS

SYMBOLS OF
WIRE
CONNECTION
AND CROSSING

Example

: WAGON

WG

P

P

17

SD

SD

WG

WG

R3

B99

P

P

7

R1

B97

2

LY

13

13

WR

OR

: WITHOUT REAR DEFOGGER

: WITH REAR DEFOGGER

OR

WR

: SEDAN

SD

WI-11

WIRING SYSTEM

BASIC DIAGNOSTICS PROCEDURE

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 ROUTING

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 POWER SUPPLY ROUT-
ING in the wiring diagram.
Accordingly, using the POWER SUPPLY ROUT-
ING and wiring diagrams permits service personnel
to understand the entire electrical arrangement of a
system.

E: ABBREVIATION IN WIRING DIA-

GRAMS

WI-00117

Symbol

Symbol

Refers to wires which are
crossed but not connected.

Refers to wires which are
connected and branched
at the dot point.

Abbr.

Full name

ABS

Antilock Brake System

ACC

Accessory

A/C

Air Conditioning

AD

Auto Down

AT

Automatic Transmission

AU

Auto Up

A/B

Air Bag

A/F

Air Fuel

ATF

Automatic Transmission Fluid

AWD

All Wheel Drive

B

Battery

D

Drive Range

DN

Down

E

Ground

ELR

Emergency Locking Retractor

F/B

Fuse & Joint Box

FL1.5

Fusible Link 1.5 mm

2

H/L

Head Light

I/F

Interface

IG

Ignition

Illumi.

Illumination

INT

Intermittent

L/C

Low Clutch

LCD

Liquid Crystal Display

LH

Left Hand

Lo

Low

M

Motor

M/B

Main Fuse Box

MG

Magnet

Mi

Middle

MT

Manual Transmission

N

Neutral Range

OP

Optional Parts

P

Parking Range

PASS

Passing

R

Reverse Range

RH

Right Hand

SBF

Slow Blow Fuse

ST

Starter

SW

Switch

UP

Up

WASH

Washer

WI-12

WIRING SYSTEM

WORKING PRECAUTIONS

2. Working Precautions

A: PRECAUTIONS WHEN WORKING 

WITH THE PARTS MOUNTED ON 
THE VEHICLE

1) When working under a vehicle which is jacked-
up, always be sure to use safety stands.
2) The parking brake must always be applied dur-
ing working. Also, in automatic transmission vehi-
cles, keep the select lever set to the P (Parking)
range.
3) Be sure the workshop is properly ventilated
when running the engine. Further, be careful not to
touch the belt or fan while the engine is operating.
4) Be careful not to touch hot metal parts, especial-
ly the radiator and exhaust system immediately af-
ter the engine has been shut off.

B: PRECAUTIONS IN TROUBLE DI-

AGNOSIS AND REPAIR OF ELEC-
TRIC PARTS

1) The battery cable must be disconnected from
the battery's (

−

) terminal, and the ignition switch

must be set to the OFF position, unless otherwise
required by the diagnostics.
2) Securely fasten the wiring harness with clamps
and slips so that the harness does not interfere with
the body end parts or edges and bolts or screws.
3) When installing parts, be careful not to catch
them on the wiring harness.
4) When disconnecting a connector, do not pull the
wires, but pull while holding the connector body.

5) Some connectors are provided with a lock. One
type of such a connector is disconnected by push-
ing the lock, and the other, by moving the lock up.
In either type the lock shape must be identified be-
fore attempting to disconnect the connector.
To connect, insert the connector until it snaps and
confirm that it is tightly connected.

6) When checking continuity between connector
terminals, or measuring voltage across the terminal
and ground, always contact tester probe(s) on ter-
minals from the wiring connection side. If the probe
is too thick to gain access to the terminal, use “mini”
test leads.
To check water-proof connectors (which are not ac-
cessible from the wiring side), contact test probes
on the terminal side being careful not to bend or
damage the terminals.

7) Sensors, relays, electrical unit, etc., are sensi-
tive to strong impacts.
Handle them with care so that they are not dropped
or mishandled.

WI-00118

Correct

Wrong

WI-00119

Example

LIFT

LIFT

PUSH

PUSH

PUSH

WI-00120

Tester probes

"Mini" test leads

WI-13

WIRING SYSTEM

SUPER MULTIPLE JUNCTION (SMJ)

3. Super Multiple Junction (SMJ)

A: HOW TO USE SUPER MULTIPLE JUNCTION (SMJ)

The “SMJ” indicated in wiring diagrams is shown in a simplified form.

B: TERMINAL ARRANGEMENT

WI-01078

B36

i1

66 Poles

66 Poles

B4 B5 B6

A4 A5 A6

C5 C6

F6

D4 D5 D6

F1

H1

C4

G6

G1

C2

K1

M1 M2

K6

L1

D1 D2

A1 A2
B1 B2

I6

J6

L2

I1

J1

H6

M4 M5 M6

L4 L5 L6 

N5 N6

O4 O5 O6

N4

P4 P5

N2

O1 O2

P1 P2

N3

O3

P3

P6

A3

B3

C3

E4 E5 E6

E1 E2

B4

B5

B6

A4

A5

A6

C5

C6

F6

D4

D5

D6

F1

H1

C4

G6

G1

C2

K1

M1

M2

K6

L1

D1

D2

A1

A2

B1

B2

I6

J6

L2

I1

J1

H6

M4

M5

M6

L4

L5

L6 

N5

N6

O4

O5

O6

N4

P4

P5

N2

O1

O2

P1

P2

N3

O3

P3

P6

A3

B3

C3

E4

E5

E6

E1

E2

Instrument Panel Wiring Harness

Bulkhead Wiring Harness