LAN(diag)-74
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK DTC.
Connect the Subaru Select Monitor and read
the DTC of the body integrated unit.
Are there any other DTC
besides U1302?
Perform diagnosis
according to other
DTC.
Go to step 2.
2
CHECK DTC.
Check the DTC displayed in the body integrated
unit.
Is the DTC displayed a current
malfunction?
Check the connec-
tion of harness
connectors. Go to
step 3.
Go to step 3.
3
CHECK DTC.
Turn the ignition switch to OFF and read DTCs
again.
Is U1302 a current malfunc-
tion?
Go to step 4.
Temporary poor
contact occurs.
4
CHECK CURRENT DATA.
Check the current data (auto A/C failure) of the
body integrated unit using the Subaru Select
Monitor.
Is OK displayed?
Go to step 5.
Perform the auto A/
C self-diagnosis.
<Ref. to AC(diag)-
9, OPERATION,
Diagnostic Chart
for Self-Diagno-
sis.>
5
CHECK AUTO A/C ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the auto A/C ECM connector
(B282).
3) Connect the Subaru Select Monitor and
then turn the ignition switch to ON.
4) Perform the clear memory operation for the
body integrated unit.
5) Read the DTC of the body integrated unit.
Is DTC U1302 detected?
Go to step 7.
Go to step 6.
6
CHECK HARNESS.
1) Disconnect the body integrated unit connec-
tor (B280) and auto A/C control module connec-
tor (B282).
2) Check open or short conditions between
body integrated unit connector and auto A/C
control module connector.
Connector & terminal
(B282) No. 10 — (B280) No. 26:
(B282) No. 9 — (B280) No. 25:
Is harness normal?
Replace auto A/C
ECM. <Ref. to AC-
35, REMOVAL,
Control Unit (Auto
A/C Model).>
Repair or replace
the open or short
circuit of harness.
7
CHECK CURRENT DATA.
Check current data (center display failure) of the
body integrated unit.
Is OK displayed?
Go to step 8.
Repair or replace
the center display.
<Ref. to ET-19,
REMOVAL, Navi-
gation Display.>
8
CHECK CENTER DISPLAY.
1) Turn the ignition switch to OFF.
2) Disconnect the center display connector
(i119).
3) Connect the Subaru Select Monitor and
then turn the ignition switch to ON.
4) Perform the clear memory operation for the
body integrated unit.
5) Read the DTC of the body integrated unit.
Is DTC U1302 detected?
Go to step 10.
Go to step 9.
9
CHECK HARNESS.
1) Disconnect the body integrated unit connec-
tor (B280) and center display connector (i119).
2) Check open or short conditions between
body integrated unit connector and center dis-
play connector.
Connector & terminal
(i119) No. 14 — (i84) No. 26:
(i119) No. 6 — (i84) No. 27:
Is harness normal?
Replace the center
display. <Ref. to
AC-35, REMOVAL,
Control Unit (Auto
A/C Model).>
Repair or replace
the open or short
circuit of harness.