Subaru Legacy IV (2008 year). Manual - part 1192

WI-20

Power Supply Circuit

WIRING SYSTEM

No.

Load

MB-1

ABS control module

VDC control module

MB-2

ABS control module

VDC control module

MB-3

Audio amplifier (Premium audio)

MB-4

Sub fan relay

MB-5

Mirror heater relay (with mirror heater)

Rear defogger

A/C control panel (rear defogger switch)

MB-6

Body integrated unit

MB-7

Main fan relay 2

MB-8

Radiator fan control unit

Main fan motor

MB-9

ECM

MB-10

Main fan relay 2

MB-11

Main fan relay 2

MB-14

Lighting switch

MB-15

Combination meter

MB-16

Headlight RH

MB-17

Headlight LH

MB-18

Diode (Headlight)

Daytime running light control module

MB-19

Horn

MB-20

Horn

MB-21

Horn switch

Body integrated unit

Remote engine start control module

MB-22

A/F, O

2

 Sensor relay

Main relay

MB-23

Main relay

A/F, O

2

 Sensor relay

MB-24

Electronic throttle control relay

MB-25

Fuel pump relay

MB-26

TCM

MB-27

ECM

Data link connector

MB-28

Ignition switch illumination

Key warning switch

Turn signal and hazard unit

Body integrated unit

MB-29

Spot map light

Home link

Body integrated unit

Room light

MB-30

Power window circuit breaker

MB-31

F/B fuse No. 16

MB-32

Parking switch

MB-33

Secondary air pump relay

MB-34

Secondary air combination valve relay 1

Secondary air combination valve relay 2

FB-1

Trailer connector (Wagon model)

FB-3

Stop light & brake switch

FB-4

Wiper deicer relay

Mirror heater relay (with mirror heater)

FB-5

Seat heater relay

FB-6

Body integrated unit

FB-8

Blower motor relay

FB-9

Front fog light relay

FB-10

Audio

Keyless entry control module

Door step light LH

Door step light RH

Clock

TV monitor

FB-11

Trunk room light (sedan model)

Luggage room light (wagon model)

Navigation control module

FB-12

Clock

Combination meter

TV monitor

FB-13

Seat heater switch

Navigation control module

FB-14

Satellite switch

FB-17

TPM control module

Impact sensor

Combination meter

FB-18

Body integrated unit

Auto A/C control module

FB-19

Remote control mirror switch

FB-20

Seat heater relay

Vanity mirror light LH (Without home link)

Vanity mirror light RH

Home link

Shade mirror

FB-21

Rear accessory power supply socket 
(Console box)

Rear accessory power supply socket 
(cargo room)

FB-22

Front accessory power supply socket

FB-23

Rear wiper motor

FB-24

Body integrated unit

Rear washer motor

FB-25

Audio

Clock

Navigation control module

TV monitor

Audio amplifier

FB-27

Front washer motor

Front wiper motor

Combination switch

No.

Load

WI-21

Power Supply Circuit

WIRING SYSTEM

FB-28

Body integrated unit

FB-31

TV monitor

FB-32

ECM

Clutch switch (MT model)

Sunroof motor ASSY

Seat belt & airbag warning light

Wiper deicer relay

Stop light and brake switch

Sunroof switch

Sunroof tilt switch

Data link connector

FB-33

Clock

FB-34

Turn signal and hazard unit

FB-35

Inhibitor switch (4AT model)

Daytime running light control module

Back-up light switch

Back-up light relay (5AT model)

Low beam relay

FB-36

Combination meter

FB-37

Body integrated unit

FB-38

ECM

TCM

Ignition coil

Fuel pump relay

Rear vehicle speed sensor

FB-41

Airbag control module

FB-42

Power window relay

FB-44

ABS control module

VDC control module

Steering angle sensor

Yaw rate sensor

FB-45

A/C control panel

FB-46

A/C relay

Pressure switch

Auto A/C control module

Intake door actuator

Sub fan relay

Blower motor relay

Mode door actuator

FB-47

Occupant detection control module

FB-48

TPM control module

Power seat LH (with seat position memory)

Impact sensor

ALT-1

ECM

ST-1

ECM

Starter relay

Clutch switch (MT model)

Inhibitor relay (AT model)

ST-2

Starter relay

No.

Load

WI-22

Ground Circuit

WIRING SYSTEM

4. Ground Circuit

A: WIRING DIAGRAM

1. BODY GROUND

WI-20953

GND-01

GND-01

F106

B

3

RADIA

T

OR F

A

N

CONTR

OL UNIT

 (H6 MODEL)

F6

B2

FR

ONT FOG LIGHT RH

F102

B2

KEYLESS B

UZZER

C:

F35

B

C12

MAIN FUSE BO

X (M/B)

R55

B4

R51

B2

V

ANITY MIRR

OR

 ILLUMI.

 LIGHT RH

R54

B2

V

ANITY MIRR

OR

 ILLUMI.

 LIGHT LH/

HOME LINK

R150

B6

SEA

T BEL

T &

AIRB

A

G

 W

ARNING 

LIGHT

R57

B

SHADE MIRR

OR

R52

B1

R

OOM LIGHT

R56

B2

SPO

T MAP LIGHT

F17

B

MAIN F

AN MO

T

OR (H4 MODEL)

F21

B2

FR

ONT FOG LIGHT LH

F19

B2

FR

ONT CLEARANCE &

FR

ONT 

TURN SIGNAL LIGHT LH

B32

B7

TURN SIGNAL & HAZARD MODULE

B225

R50

B90

B2

6

LO

W BEAM RELA

Y

F27

B9

RELA

Y HOLDER

(FWD SWITCH)

F27

B1

9

MAIN F

AN RELA

Y 2

(H4 MODEL)

B225

*

12

0

PO

WER WINDO

W 

RELA

Y

B225

B4

0

SEA

T HEA

TER RELA

Y

SHOR

T CONNECT

OR

B225

B3

2

MIRR

OR HEA

TER RELA

Y

GND-02

B

GB-1

GP

B

B

GB-2

B

1

B

B

1

R52

1 2 3

(BLUE)

C:

F35

1 2

3 4 5

6 7 8 9 10 11 12

B32

1 2

3

4 5 6 7 8

SUNROOF MOTOR ASSY

(SEDAN MODEL)

F3

B2

FRONT CLEARANCE &

FRONT TURN SIGNAL

LIGHT RH

GND-03

A

F106

1 2 3

F19

F3

1 2 3

B2

MAIN F

AN MO

T

O

R

F17

R55

1 2 3 4
6 7 8 9

5

10

(GRAY)

NA

: NON-TURBO MODEL

4A

: 4AT MODEL

TB

: TURBO  MODEL

WH

: WITH HOME LINK

OH

: WITHOUT HOME LINK

*

1

: MT MODEL
: AT MODEL

: B
: GR

F17

2 1

(BLACK)

NA :

1 2

R56

R51

(BLACK)

F11

(GRAY)

F17

(GRAY)

TB :

R54

(BLACK)

OH :

TB

NA

R54

1 2 3

WH :

R57

3 2 1

R50

1 2 3

4 5 6 7

8 9 10 11 12 13 14 15 16

B225

13
14

15 16

17

27

24

25
26

20

21
22

23

29
30

31

28

32

35

33
34

37
38

39

36

40

8

9

10

11 12

1

2

5

3

4

7

6

19

18

RELAY BLOCK

(BLACK)

SECOND

AR

Y AIR PUMP

F11

B1

TB

2

1

2

GR

B

GR

GR

B182

B181

B181

1 2

RELAY HOLDER

F27

12

11

10

18
19

16

15

17

9

20 21 22

8

4 5

3

2

1

7

6

14

13

(BLACK)

4A

(GRAY)

(GRAY)

(GRAY)

F6

F21

(BROWN)

(BROWN)

1 2

F102

1 2

(BLACK)

R150

2 3 4 5

1

6 7 8

(GRAY)

MT

AT

AT

WI-23

Ground Circuit

WIRING SYSTEM

WI-20954

GND-02

GND-02

GB-6

B

23

BY

B

BY

24

BY

BY

16

B98

R2

GND-01

B

B

GB-4

BY

B

B143

B

MAIN FUSE

BO

X (M/B)

B116

B4

A

T

 SELECT LEVER

B:

B:

C:

D:

B55

BY

B22

BY

B23

TCM (5A

T MODEL)

B350

B1

KEY LOCK SOLENOID

B152

B180

BD

8

FUSE & RELA

Y BO

X (F/B)

B71

B2

B1

6

COMBINA

TION SWITCH

(LIGHTING)

B70

B2

COMBINA

TION SWITCH

(WIPER)

GND-06

C

GND-06

D

B280

B281

BY

C8

BY

C9

BY

B22

BOD

Y INTEGRA

TED UNIT

GND-04

E

GND-03

F

B36

i1

B20

B:

A:

i1

5 6 7 8

2

1

9

4

3

10

24

22

23

25

27

26

28

11 12 13

14 15 16

17 18 19 20 21

B71

2

3

4 5 6

7

1

8

9

10

11 12 13 14 15

16

17

B143

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

B:

A:

1 2 3

4 5 6 7

8 9 10 11 12 13 14 15 16

B98

B242

B

A10

D

A

YTIME R

UNNING LIGHT

CONTR

OL MODULE

B242

1 2 3 4
6 7 8 9

5

10

5

4

6 7

8

2

1

9

3

10

22

23

11 12 13 14 15

24 25

26 27

16 17 18

28 29

19 20

21

30

B280

B:

5 6 7

8

2

1

9

4

3

10

24

22 23

25

11 12 13 14 15

26

27 28

16 17 18 19

20 21

B281

C:

B116

1 2

3 4 5

6 7 8 9 10 11 12

B76

DELIVER

Y (TEST) MODE

CONNECT

OR

BY

2

B231

BY

3

STEERING ANGLE SENSOR

(WITH VDC)

B152

1 2

3 4

5 6 7 8 9 10

D:

(GRAY)

B231

B350

1 2 3 4

(BLACK)

BY

24

REMO

TE ENGINE ST

AR

T

CONTR

OL UNIT

B180

3 4

1 2

8 9 10 11 12

13 14 15 16 17 18 19 20 21 22 23 24

5 6 7

B70

1

9

10

18

13

4 5 6

14 15

12

11

17

16

2

3

7

8

5

6

7

2

1

3

4

29

10 11 12 13 14 15

25

24

16

30

9

8

17 18 19

20
28

21 22 23

32

31

26 27

33

34 35

B:

B55

(GREEN)

B76

1
2

1