Subaru 2009 IMPREZA Service Manual page 3377

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
Step
1 CHECK DTC.
Read the DTC of body integrated unit using
Subaru Select Monitor. <Ref. to LAN(diag)-15,
READ DIAGNOSTIC TROUBLE CODE (DTC),
OPERATION, Subaru Select Monitor.>
2 CHECK DTC.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from body inte-
grated unit and reconnect.
3) Turn the ignition switch to ON.
4) Wait approx. 2 minutes.
5) Read the DTC of body integrated unit using
Subaru Select Monitor.
3 CHECK FUSE.
1) Turn the ignition switch to OFF.
2) Inspect the fuse.
4 CHECK HARNESS.
1) Disconnect the body integrated unit connec-
tor (B280).
2) Turn the ignition switch to ON.
3) Measure the voltage between body inte-
grated unit connector and chassis ground using
tester.
Connector & terminal
(B280) No. 1 (+) — Chassis ground (–):
5 CHECK CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the body integrated unit connec-
tor (B280).
Check
Is B1103 current malfunction? Go to step 2.
Is B1103 current malfunction? Go to step 3.
Is the fuse OK?
Is the voltage 8.5 — 16.5 V?
Is there poor contact of connec-
tor?
LAN(diag)-44
Yes No
Go to step 5.
Go to step 5.
Go to step 4. Replace the defec-
tive fuse.
Replace the body Repair or replace
integrated unit. the open or
<Ref. to SL-50, shorted circuit
REMOVAL, Body between body inte-
Integrated Unit.> grated unit and
fuse.
Repair or replace A temporary
the poor contact of change of voltage
connector. occurred.