LAN(diag)-56
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK DTC.
Using the Subaru Select Monitor, confirm all
DTCs. <Ref. to LAN(diag)-15, READ DIAG-
NOSTIC TROUBLE CODE (DTC), OPERA-
TION, Subaru Select Monitor.>
Is any DTC other than for the
body integrated unit displayed?
Perform the diag-
nosis according to
displayed DTC.
Go to step
2
.
2
CHECK DTC.
1) Turn the ignition switch to OFF
o
ON.
2) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1202 a current malfunc-
tion?
Go to step
3
.
Go to step
10
.
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.
Is U1202 a current malfunc-
tion?
Go to step
4
.
Go to step
10
.
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:
Is harness normal?
Go to step
5
.
Repair or replace
the harness.
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:
Is harness normal?
Go to step
6
.
Repair or replace
the harness.
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