Subaru Legacy (2005 year). Manual — part 1048

LAN(diag)-71

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

4

CHECK CURRENT DATA.
Connect the Subaru Select Monitor and dis-
play current data of the body integrated unit
(auto A/C fail).

Is OK displayed?

Go to step 5.

Perform auto A/C
self-diagnosis.
<Ref. to AC(diag)-
10, OPERATION,
Diagnostic Chart
for Self-Diagno-
sis.>

5

CHECK AUTO A/C ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the auto A/C ECM connector.
3) Turn the ignition switch to ON.

Does the communications
error display disappear?

Go to step 6.

Go to step 7.

6

CHECK HARNESS.
1) Disconnect the body integrated unit con-
nector (B280) and auto A/C control module
connector (B283).
2) Check for open and short circuits between
body integrated unit connector and auto A/C
control module connector.

Connector & terminal

(B283) No. 1 — (B280) No. 26:
(B283) No. 11— (B280) No. 25:

Is the harness in normal condi-
tion?

Replace the auto
A/C ECM. <Ref. to
AC-33, REMOVAL,
Control Unit (Auto
A/C Model).>

Repair or replace
the open or short
circuit of harness.

7

CHECK CURRENT DATA.
Connect the Subaru Select Monitor and dis-
play current data of the body integrated unit
(meter fail).

Is OK displayed?

Go to step 8.

Replace the com-
bination meter.
<Ref. to IDI-15,
REMOVAL, Com-
bination Meter.>

8

CHECK COMBINATION METER.
1) Turn the ignition switch to OFF.
2) Disconnect the combination meter connec-
tor.
3) Turn the ignition switch to ON.

Is B0301 detected?

Go to step 9.

Replace the com-
bination meter.
<Ref. to IDI-15,
REMOVAL, Com-
bination Meter.>

9

CHECK HARNESS.
1) Disconnect the combination meter connec-
tor (i10).
2) Check for open and short circuits between
the body integrated unit and combination
meter connectors.

Connector & terminal

(i10) No. 21 — (i84) No. 27:
(i10) No. 22 — (i84) No. 26:

Is the harness in normal condi-
tion?

Go to step 10.

Repair or replace
the open or short
circuit of harness.

10

CHECK CURRENT DATA.
Check the current data of the body integrated
unit (center display fail).

Is OK displayed?

Go to step 11.

Repair or replace
the center display.
<Ref. to ET-15,
REMOVAL, Navi-
gation Display.>

11

CHECK CENTER DISPLAY.
1) Turn the ignition switch to OFF.
2) Disconnect the center display connector
(i90 or i92).
3) Turn the ignition switch to ON.

Does B0300 disappear?

Go to step 12.

Go to step 13.

Step

Check

Yes

No

LAN(diag)-72

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

12

CHECK HARNESS.
1) Disconnect the body integrated unit con-
nector (B280) and the center display connector
(i90 or i92).
2) Check for open and short circuits between
the body integrated unit connector and the
center display connector.
Connector & terminal

Model with navigation

(i90) No. 6 — (i84) No. 26:
(i90) No. 14 — (i84) No. 27:

Model without navigation

(i92) No. 2 — (i84) No. 26:
(i92) No. 4 — (i84) No. 27:

Is the harness in normal condi-
tion?

Replace the center
display. <Ref. to
ET-15, REMOVAL,
Navigation Dis-
play.>

Repair or replace
the open or short
circuit of harness.

13

CHECK AUTO A/C CONTROL MODULE.
1) Display the current data of body integrated
unit using Subaru Select Monitor.
2) Display the number of blower fan levels in
the analog data.
3) Read the data display when the number of
blower fan levels is changed on air conditioner
control part.

Does the data display change? Go to step 14.

Go to step 15.

14

CHECK COMBINATION METER.
1) Display the current data of body integrated
unit using Subaru Select Monitor.
2) Display the number of blower fan levels in
the analog data.
3) Read the display of data and combination
meter when each door is opened/closed.

Do the body integrated unit
data indicator and combina-
tion meter indicator change
according to operation?

Go to step 15.

Go to step 16.

15

CHECK AUTO A/C CONTROL MODULE
HARNESS.
1) Disconnect the auto A/C control module
connector.
2) Disconnect the body integrated unit con-
nector.
3) Measure the resistance between the body
integrated unit and auto A/C control module
harness.

Connector & terminal

(B280) No. 26 — (B283) No. 1:
(B280) No. 25 — (B283) No. 11:

Is the resistance less than
10

Ω?

Go to step 17.

Repair the open
circuit of harness
or replace har-
ness.

16

CHECK COMBINATION METER HARNESS.
1) Disconnect the combination meter connec-
tor.
2) Disconnect the body integrated unit con-
nector.
3) Measure the resistance between the body
integrated unit and combination meter connec-
tor.

Connector & terminal

(i84) No. 27 — (i10) No. 21:
(i84) No. 26 — (i10) No. 22:

Is the resistance less than
10

Ω?

Go to step 18.

Repair the open
circuit of harness
or replace har-
ness.

17

CHECK AUTO A/C CONTROL MODULE.
Perform auto A/C control module self-diagno-
sis. <Ref. to AC(diag)-13, A/C CONTROL
SYSTEM SELF-DIAGNOSIS, OPERATION,
Diagnostic Chart for Self-Diagnosis.>

Is the self-diagnosis OK?

Go to step 18.

Replace the auto
A/C control mod-
ule. <Ref. to AC-
33, REMOVAL,
Control Unit (Auto
A/C Model).>

Step

Check

Yes

No

LAN(diag)-73

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

18

CHECK COMBINATION METER.
Perform self-diagnosis for the combination
meter system. <Ref. to IDI-3, SELF-DIAGNO-
SIS, INSPECTION, Combination Meter Sys-
tem.>

Is the self-diagnosis OK?

Go to step 19.

Replace the com-
bination meter.
<Ref. to IDI-15,
REMOVAL, Com-
bination Meter.>

19

CHECK THE BODY INTEGRATED UNIT.
Read the data of “body integrated unit data
received” on ECM data display using Subaru
Select Monitor.

Is “Yes” displayed?

Go to step 20.

Replace the body
integrated unit.
<Ref. to SL-44,
REMOVAL, Body
Integrated Mod-
ule.>

20

CHECK THE BODY INTEGRATED UNIT.
Read the data of “body integrated unit counter
update” on ECM data display using Subaru
Select Monitor.

Is “Yes” displayed?

Temporary poor
contact occurs.
Check the connec-
tion of connector.

Replace the body
integrated unit.
<Ref. to SL-44,
REMOVAL, Body
Integrated Mod-
ule.>

Step

Check

Yes

No

LAN(diag)-74

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

T: DTC B0302 CAN-LS BUS OFF

DTC DETECTING CONDITION:
Because of a lot of error data occurred, some units have been disconnected not to affect other units.
Communication failure from the unit in which error is occurred is input at the same time.
TROUBLE SYMPTOM:
“Er LC” is displayed in odo/trip meter.
WIRING DIAGRAM:

Step

Check

Yes

No

1

CHECK DTC.
Read the DTC of body integrated unit using
Subaru Select Monitor.

Is there any DTC other than
B0302?

Perform the diag-
nosis according to
other DTC.

Go to step 2.

2

CHECK DTC.
Check the DTC displayed in the body inte-
grated unit.

Is the DTC displayed currently
malfunctioning?

Check the connec-
tion of harness
connector. Go to
step 3.

Go to step 3.

3

CHECK DTC.
Turn the ignition switch to OFF and read the
DTC again.

Is B0302 currently malfunction-
ing?

Go to step 4.

Temporary poor
contact occurs.

i77

i10

B283

21

22

14

6

i90

A27

A26

B26

B25

A: i84

B: B280

1

11

:

AE

AE

AE

4

2

i92

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

0

3

1

2

B: B280

A: i84

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

i90

2 3 4 5

6 7 8 9

12 13 14 15 16 17 18 19 20 21 22

10

1

11

5 6 7

8

2

1

4

3

11

10

12 13 14 15

8

16

B283

9

19 20

10

5 6 7

2

1

4

3

13

12

11

14 15 16 17

8

18

i10

i77

1 2 3 4 5 6 7 8 9 10 11 12

i92

1 2
3 4

WN

:

ON

:

:

:

1

*

2

*

WN

ON

WN

ON

1

*

2

*

1

*

1

*

2

*

2

*

CAN JOINT
CONNECTOR

LAN00254

COMBINATION METER

TWISTED P

AIR LINE

BODY
INTEGRATED
UNIT

CENTER
DISPLAY

CENTER
DISPLAY

AUTO A/C
CONTROL
MODULE

WITHOUT NAVIGATION

WITH NAVIGATION

TERMINAL No. OPTIONAL
ARRANGEMENT
AMONG 1, 2, 3, 4, 5 AND 6

TERMINAL No. OPTIONAL
ARRANGEMENT
AMONG 7, 8, 9, 10, 11 AND 12

WITH AUTO A/C