Subaru 2009 IMPREZA Service Manual page 3398

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK DTC.
Read all DTCs using the 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 (B280, B310 or
B301, B55, B136, B230, B231) that are con-
nected to high 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 (B280, B310 or
B301, B55, B136, B230, B231) that are con-
nected to high 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
Models with VDC
(B40) No. 6 — (B136) No. 27:
(B40) No. 6 — (B310) No. 35:
(B40) No. 6 — (B230) No. 2:
(B40) No. 6 — (B231) No. 2:
(B40) No. 6 — (B55) No. 18:
(B40) No. 6 — (B280) No. 3:
Models without VDC
(B40) No. 6 — (B136) No. 27:
(B40) No. 6 — (B301) No. 26:
(B40) No. 6 — (B55) No. 18:
(B40) No. 6 — (B280) No. 3:
5 CHECK HARNESS.
Using the tester, inspect the open circuit of har-
ness and short (power supply-output short,
GND-output short).
Connector & terminal
Models with VDC
(B40) No. 14 — (B136) No. 35:
(B40) No. 14 — (B310) No. 10:
(B40) No. 14 — (B230) No. 3:
(B40) No. 14 — (B231) No. 1:
(B40) No. 14 — (B55) No. 17:
(B40) No. 14 — (B280) No. 9:
Models without VDC
(B40) No. 14 — (B136) No. 35:
(B40) No. 14 — (B301) No. 11:
(B40) No. 14 — (B55) No. 17:
(B40) No. 14 — (B280) No. 9:
Check
Is there DTC U1202?
Is U1221 a current malfunc-
tion?
Is U1221 a current malfunc-
tion?
Is harness normal?
Is harness normal?
LAN(diag)-65
LAN SYSTEM (DIAGNOSTICS)
Yes No
Perform the diag- Go to step 2.
nosis according to
DTC.
Go to step 3. Go to step 8.
Go to step 4. Go to step 8.
Go to step 5. Repair or replace
the harness.
Go to step 6. Repair or replace
the harness.