Subaru Legacy 2005 Service Manual page 4198

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
Step
4 CHECK CURRENT DATA.
Connect the Subaru Select Monitor and dis-
play current data of the body integrated unit
(auto A/C fail).
5 CHECK AUTO A/C ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the auto A/C ECM connector
(B283).
3) Turn the ignition switch to ON and read the
DTC.
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:
7 CHECK CURRENT DATA.
Connect the Subaru Select Monitor and dis-
play current data of the body integrated unit
(meter fail).
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.
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:
10 CHECK HARNESS.
1) Disconnect the CAN junction connector
(i77) and the body integrated unit connector
(i84).
2) Measure the resistance between connector
terminals.
Connector & terminal
(i84) No. 27 — (i77) No. 1 — 6:
(i84) No. 26 — (i77) No. 7 — 12:
NOTE:
The junction connector of i77 is in user defined
alignment.
Check
Is OK displayed?
Does B0300 disappear?
Is the harness in normal condi-
tion?
Is OK displayed?
Is B0300 detected?
Is the harness in normal condi-
tion?
Is the resistance less than
10Ω?
LAN(diag)-68
Yes
Go to step 5. Perform auto A/C
self-diagnosis.
<Ref. to AC(diag)-
10, OPERATION,
Diagnostic Chart
for Self-Diagno-
sis.>
Go to step 6. Go to step 7.
Replace the auto Repair or replace
A/C ECM. <Ref. to the open or short
AC-33, REMOVAL, circuit of harness.
Control Unit (Auto
A/C Model).>
Go to step 8. Replace the com-
bination meter.
<Ref. to IDI-15,
REMOVAL, Com-
bination Meter.>
Go to step 10. Go to step 9.
Replace the com- Repair or replace
bination meter. the open or short
<Ref. to IDI-15, circuit of harness.
REMOVAL, Com-
bination Meter.>
Go to step 11. Repair the short
circuit of harness
or replace har-
ness.
No