Subaru 2009 IMPREZA Service Manual page 3408

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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.
Read the DTC of body integrated unit using
Subaru Select Monitor.
3 CHECK DTC.
1) Turn the ignition switch to OFF.
2) Disconnect all connectors (i84, i10, i88, i85
or i50) that are connected to low speed CAN
communication line.
3) Connect the disconnected connectors.
4) Turn the ignition switch to ON.
5) Read the DTC of body integrated unit using
Subaru Select Monitor.
4 CHECK HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect all connectors (i84, i10, i88, i85
or i50) that are connected to low speed CAN
communication line.
3) Using the tester, inspect the open circuit of
harness and short (power supply-output short,
GND-output short).
Connector & terminal
(i84) No. 1 — (i10) No. 27 (combination
meter):
(i84) No. 9 — (i10) No. 26 (combination
meter):
(i84) No. 1 — (i88) No. 20 (auto A/C):
(i84) No. 9 — (i88) No. 19 (auto A/C):
(i84) No. 1 — (i85) No. 12 (audio):
(i84) No. 9 — (i85) No. 11 (audio):
(i84) No. 1 — (i50) No. 18 (navigation):
(i84) No. 9 — (i50) No. 6 (navigation):
5 CHECK AUDIO OR NAVIGATION.
1) Connect the disconnected connectors.
2) Disconnect the connector of navigation (i85)
or audio (i50).
3) Turn the ignition switch to ON.
4) Read the DTC of body integrated unit using
Subaru Select Monitor.
6 CHECK AUTO A/C CONTROL MODULE.
1) Turn the ignition switch to OFF.
2) Connect the audio or navigation module.
3) Disconnect the auto A/C control module
connector (i88).
4) Turn the ignition switch to ON.
5) Read the DTC of body integrated unit using
Subaru Select Monitor.
7 CHECK COMBINATION METER.
1) Turn the ignition switch to OFF.
2) Connect the disconnected connectors.
3) Perform the self-diagnosis of combination
meter. <Ref. to IDI-4, SELF-DIAGNOSIS,
INSPECTION, Combination Meter System.>
Check
Are there DTC U1300 or
U1302?
Is U1301 current malfunction? Go to step 3.
Is U1301 current malfunction? Go to step 4.
Is harness normal?
Is U1301 current malfunction? Go to step 6.
Is U1301 current malfunction? Go to step 7.
Is the self-diagnosis of combi-
nation meter OK?
LAN(diag)-75
LAN SYSTEM (DIAGNOSTICS)
Yes No
Perform the diag- Go to step 2.
nosis according to
DTC.
Go to step 9.
Go to step 9.
Go to step 5. Repair or replace
the harness.
Go to step 9.
Replace the auto
A/C control mod-
ule. <Ref. to AC-
33, REMOVAL,
Control Unit (Auto
A/C Model).>
Go to step 8. Replace the com-
bination meter.
<Ref. to IDI-16,
REMOVAL, Com-
bination Meter.>