Subaru Legacy IV (2008 year). Service 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
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