Subaru Legacy (2005 year). Manual - part 1039

LAN(diag)-35

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK FUSE.
1) Turn the ignition switch to OFF.
2) Remove the fuse (No. 7).

Is the fuse blown out?

Replace the fuse 
(No. 7). If the 
replaced fuse has 
blown out easily, 
repair the short cir-
cuit of harness 
between fuse (No. 
7) and body inte-
grated module.

Go to step 2.

2

CONTINUITY CHECK OF WIRING HAR-
NESS.
1) Disconnect the connector from body inte-
grated module.
2) Measure the voltage between body inte-
grated module connector and chassis ground.

Connector & terminal

(B281) No. 2 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Go to step 3.

Repair the har-
ness for open or 
shorted circuit 
between body inte-
grated module and 
fuse.

3

CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in body 

integrated module connector?

Repair the poor 
contact connector.

Go to step 4.

4

CHECK BODY INTEGRATED MODULE HAR-
NESS.
1) Connect all the connectors.
2) Perform the clear memory mode.
3) Read DTC.

Is the same DTC displayed on 
Subaru Select Monitor?

Replace the body 
integrated mod-
ule. <Ref. to SL-
44, Body Inte-
grated Module.>

Temporary poor 
contact occurs.

LAN(diag)-36

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

E: DTC B0102 BATT P/SUPPLY MALFUNCTION CONT.

DTC DETECTING CONDITION:
Battery power backup circuit is open or shorted.
TROUBLE SYMPTOM:
• Malfunction indicator light may illuminates.
• Keyless entry, room light and key illumination do not operate.
• “En IU” may display in combination meter.

NOTE:
When some B0101 BATT p/supply malfunction cont. are output at the same time, all function of body inte-
grated module may not function.
WIRING DIAGRAM:

LAN00171

B7

C2

A21

C9

B22

C8

24

13

i84

B52

B280

R168

B:

A:

1 2 3 4

5 6 7 8 9

10 11 12

19 20

13 14 15 16 17 18

R168

B52

3 4

1 2

8 9 10 11

12 13 14 15 16 17 18 19 20 21 22 23 24

5

6 7

E

MAIN SBF

FB-18 No.7

B281

C:

E

E

B280

B:

B281

C:

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

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

i84

A:

1 2

3 4

5 6

7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

24 25

26 27 28 29

30 31 32 33

34 35

BATTERY

BODY INTEGRATED 

MODULE

B

A

CK-UP

PO

WER SUPPL

Y

SYSTEM CONTR

OL

PO

WER SUPPL

Y

MB-29 No.8

MAIN FUSE BOX

FUSE & RELAY BOX

LAN(diag)-37

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK FUSE.
1) Turn the ignition switch to OFF.
2) Remove the fuse (No. 8).

Is the fuse blown out?

Replace the fuse 
(No. 8). If the 
replaced fuse has 
blown out easily, 
repair the short cir-
cuit of harness 
between fuse (No. 
8) and body inte-
grated module.

Go to step 2.

2

CONTINUITY CHECK OF WIRING HAR-
NESS.
1) Disconnect the connector from body inte-
grated module.
2) Measure the voltage between body inte-
grated module connector and chassis ground.

Connector & terminal

(B280) No. 7 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Go to step 3.

Repair the har-
ness for open or 
shorted circuit 
between body inte-
grated module and 
fuse.

3

CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in body 

integrated module connector?

Repair the poor 
contact connector.

Go to step 4.

4

CHECK BODY INTEGRATED MODULE HAR-
NESS.
1) Connect all the connectors.
2) Perform the clear memory mode.
3) Read DTC.

Is the same DTC displayed on 
Subaru Select Monitor?

Replace the body 
integrated mod-
ule. <Ref. to SL-
44, Body Inte-
grated Module.>

Temporary poor 
contact occurs.

LAN(diag)-38

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

F: DTC B0103 IGNITION POWER FAILURE

DTC DETECTING CONDITION:
IGN power supply circuit is open or shorted.
TROUBLE SYMPTOM:
Symptoms such as illuminating the malfunction indicator light or high speed CAN error display “Er HC” may
occur.
WIRING DIAGRAM:

LAN00172

A1

A24

1

8

B72

1

B

2

4

ACC

ACC

OFF

IG

ON

B52

3 4

1 2

8 9 10 11

12 13 14 15 16 17 18 19 20 21 22 23 24

5

6 7

B280

B:

B281

C:

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

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

i84

A:

1 2

3 4

5 6

7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

24 25

26 27 28 29

30 31 32 33

34 35

1 2 3 4

5 6 7 8 9

10 11 12

19 20

13 14 15 16 17 18

i5

B52

i5

E

MAIN SBF

FB-28 No.31

i84

B280

B:

A:

B281

C:

BATTERY

BODY INTEGRATED 

MODULE

A

CC PO

WER SUPPL

Y

IG PO

WER SUPPL

Y

IGNITION SWITCH

A21

C9

B22

C8

E

E

FB-37 No.12

1

3

4 5 6

2

B72

FUSE & RELAY BOX