Subaru Legacy 2005 Service Manual page 4202

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
Step
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:
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.
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.
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:
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:
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.>
Check
Is the harness in normal condi-
tion?
Does the data display change? Go to step 14.
Do the body integrated unit
data indicator and combina-
tion meter indicator change
according to operation?
Is the resistance less than
10Ω?
Is the resistance less than
10Ω?
Is the self-diagnosis OK?
LAN(diag)-72
Yes
Replace the center Repair or replace
display. <Ref. to the open or short
ET-15, REMOVAL, circuit of harness.
Navigation Dis-
play.>
Go to step 15.
Go to step 15. Go to step 16.
Go to step 17. Repair the open
circuit of harness
or replace har-
ness.
Go to step 18. Repair the open
circuit of harness
or replace har-
ness.
Go to step 18. Replace the auto
A/C control mod-
ule. <Ref. to AC-
33, REMOVAL,
Control Unit (Auto
A/C Model).>
No