Subaru Legacy IV (2008 year). Service manual - part 1190

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

WI-13

Basic Diagnostic Procedure

WIRING SYSTEM

F: ABBREVIATION IN WIRING DIAGRAMS

Abbr.

Full name

A/B

Airbag

A/C

Air Conditioner

A/F

Air/Fuel (Air fuel ratio sensor)

ABS

Anti-lock Brake System

ACC

Accessory

ALT

Generator

ASSY

Assembly

AT

Automatic Transmission

ATF

Automatic transmission fluid

AWD

All Wheel Drive

B, BAT

Battery

CAN

Communication Area Network

CPU

Central Processing Unit

D

Drive Range

D, DN

Down

E

Ground

ECO

Economy

ECM

Engine Control Module (ECM)

EGR

Exhaust Gas Recirculation

F/B

Fuse & Relay box

FL

Front Left

FR

Front Right

FWD

Front Wheel Drive

G

Gravity (G sensor)

H/L

Headlight

HI

High

HID

High Intensity Discharge

I/F

Interface

IG

Ignition

Illumi.

Illumination

INT

Intermittent

LCD

Liquid Crystal Display

LH

Left Hand

Lo

Low

M

Motor

M/B

Main Fuse Box

MG

Magnet

Mi

Middle

MT

Manual Transmission

MID

Multi Information Display

MIST

Wiper mist (One-touch)

MT

Manual Transmission

N

Neutral Range

NA

Natural Aspiration

NAVI

Navigation

OP

Optional Parts or Open

P

Parking Range

PASS

Passing

PCV

Positive Crankcase Ventilation Valve

R

Reverse Range

R, RH

Right Hand

RL

Rear Left

RR

Rear Right

SBF

Slow Blow Fuse

SI-DRIVE

SUBARU Intelligent Drive

S/S

SPORT Shift

ST

Starter

SW

Switch

TB

Turbo

TCM

Transmission Control Module

TPM

Tire Pressure Monitor

TPMS

Tire Pressure Monitor System

TV

Television

U, UP

Up

VDC

Vehicle Dynamics Control

VICS

Vehicle Information and Communication 
System

WASH

Washer

Abbr.

Full name

WI-14

Working Precautions

WIRING SYSTEM

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 rigid rack.
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 turned off.

B: PRECAUTIONS IN TROUBLE 

DIAGNOSIS AND REPAIR OF 
ELECTRIC 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 clips 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 connected securely.

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
measurable from the wiring side), contact test
probes on the terminal side. Be 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-02757

WI-02758

EXAMPLE

WI-09366

WI-15

Power Supply Circuit

WIRING SYSTEM

3. Power Supply Circuit

A: WIRING DIAGRAM

WI-13119

P-SUP-01

P-SUP-01

MAIN FUSE BOX (M/B)

FUSE & RELAY BOX (F/B)

H/L

RELAY

RH

MAIN

FAN

RELAY-1

MAIN

SBF

H/L

RELAY

LH

NO. 8

NO. 11

NO. 12

NO. 13

NO. 14

NO. 15

NO. 16

NO. 27

NO. 28

NO. 29

NO. 30

NO. 31

NO. 32

NO. 33

NO. 20

NO. 21

NO. 22

NO. 23

NO. 24

NO. 25

NO. 26

NO. 13

NO. 14

NO. 15

NO. 16

NO. 17

NO. 18

NO. 19

NO. 6

NO. 7

NO. 8

NO. 9

NO. 10

NO. 11

NO. 12

NO. 1

NO. 2

NO. 3

NO. 4

NO. 5

NO. 9

NO. 10

NO. 3

NO. 4

NO. 1

NO. 2

NO. 5

NO. 6

NO. 7

SBF-8

SBF-6

SBF-2

SBF-3

SBF-4

SBF-7

SBF-5

SBF-1

HORN

RELAY

R.DEF

RELAY

TAIL

RELAY

SECONDARY AIR FUSE & RELAY BOX

SBF-9

AIR CUT
RELAY 1

AIR

CUT

No. 17

AIR CUT
RELAY 2

AIR

PUMP

RELA

Y