Subaru LEGACY 2004 Service Manual page 782

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
Step
1 CHECK HARNESS.
1) Disconnect the CAN junction connector
(i77) and body integrated unit connector (i84).
2) Measure the resistance between connector
terminals.
Connector & terminal
(i84) No. 26 — (i77) No. 8:
(i84) No. 27 — (i77) No. 2:
2 CHECK HARNESS.
1) Disconnect the combination meter connec-
tor.
2) Measure the resistance between junction
connector and combination meter connector.
Connector & terminal
(i10) No. 21 — (i77) No. 1:
(i10) No. 22 — (i77) No. 7:
3 CHECK HARNESS.
1) Disconnect the center display connector
(i90).
2) Measure the resistance between junction
connector and center display connector.
Connector & terminal
Model with navigation
(i90) No. 6 — (i77) No. 5:
(i90) No. 14 — (i77) No. 11:
Model without navigation
(i103) No. 2 — (i77) No. 5:
(i103) No. 4 — (i77) No. 11:
4 CHECK HARNESS.
1) Disconnect the body integrated unit con-
nector (B280) and auto A/C control unit con-
nector (B238).
2) Measure the resistance between body inte-
grated unit connector and auto A/C control unit
connector.
Connector & terminal
(B238) No. 1 — (B280) No. 26:
(B238) No. 11 — (B280) No. 25:
5 CHECK HARNESS.
1) Connect the junction connector.
2) Measure the resistance between body inte-
grated unit connector and chassis ground.
Connector & terminal
(B280) No. 25 — Chassis ground:
(B280) No. 26 — Chassis ground:
(i84) No. 26 — Chassis ground:
(i84) No. 27 — Chassis ground:
6 CHECK HARNESS.
1) Turn the ignition switch to ON.
2) Measure the voltage between body inte-
grated unit connector and chassis ground.
Connector & terminal
(B280) No. 25 (+) — Chassis ground (
(B280) No. 26 (+) — Chassis ground (
(i84) No. 26 (+) — Chassis ground (
(i84) No. 27 (+) — Chassis ground (
7 CHECK CENTER DISPLAY FAIL.
Read the current data of body integrated unit.
Check
Is the resistance less than 10
"?
Is the resistance less than 10
"?
Is the resistance less than 10
"?
Is the resistance less than 10
"?
Is the resistance less than 10
"?
Is the voltage more than 6 V?
!
):
!
):
!
):
!
):
Is center display fail OK?
LAN(diag)-66
Yes
Go to step 2. Repair or replace
the short circuit of
harness.
Go to step 3. Repair or replace
the open circuit of
harness.
Go to step 4. Repair or replace
the open circuit of
harness.
Go to step 5. Repair or replace
the open circuit of
harness.
Repair or replace Go to step 6.
the short circuit of
harness.
Repair or replace Go to step 7.
the short circuit of
harness.
Go to step 8. Replace the center
display.
No