Subaru Legacy 2004 Service Manual page 4107

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK IGNITION SWITCH.
2 CHECK BATTERY.
1) Turn the ignition switch to OFF.
2) Measure the battery voltage.
3 CHECK BATTERY TERMINAL.
4 CHECK COMMUNICATION OF SUBARU SE-
LECT MONITOR.
1) Turn the ignition switch to ON.
2) Using the Subaru Select Monitor, check
whether communication to other systems can
be executed normally.
5 CHECK COMMUNICATION OF SUBARU SE-
LECT MONITOR.
1) Turn the ignition switch to OFF.
2) Disconnect the body integrated unit con-
nector.
3) Turn the ignition switch to ON.
4) Check whether communication to other
systems can be executed normally.
6 CHECK HARNESS CONNECTOR BETWEEN
EACH CONTROL UNIT AND SUBARU SE-
LECT MONITOR.
1) Turn the ignition switch to ON.
2) Disconnect the body integrated unit con-
nector.
3) Measure the resistance between data link
connector and chassis ground.
Connector & terminal
(B40) No. 10 — Chassis ground:
7 CHECK OUTPUT SIGNAL TO BODY INTE-
GRATED UNIT.
1) Turn the ignition switch to ON.
2) Measure the voltage between body inte-
grated unit and chassis ground.
Connector & terminal
(B40) No. 10 (+) — Chassis ground (
8 CHECK HARNESS CONNECTOR BETWEEN
BODY INTEGRATED UNIT AND DATA LINK
CONNECTOR.
Measure the resistance between body inte-
grated unit and data link connector.
Connector & terminal
(B40) No. 10 — (B280) No. 19:
9 CHECK INSTALLATION OF BODY INTE-
GRATED UNIT CONNECTOR.
Turn the ignition switch to OFF.
Check
Is the ignition switch ON?
Is the voltage more than 11 V? Go to step 3.
Is there poor contact at battery
terminal?
Are system and model year
displayed?
Are system and model year
displayed?
Is the resistance more than 1
M"?
Is the voltage less than 1 V?
!
):
Is the resistance less than 1
"?
Is the body integrated unit con-
nector inserted into body inte-
grated unit until the clamp
locks onto it?
LAN(diag)-31
LAN SYSTEM (DIAGNOSTICS)
Yes
Go to step 2. Turn the ignition
switch to ON, and
select Integ. Unit
mode using Sub-
aru Select Monitor.
Charge or replace
the battery.
Repair or tighten Go to step 4.
the battery termi-
nal.
Go to step 7. Go to step 5.
Go to step 7. Go to step 6.
Go to step 7. Repair the har-
ness and connec-
tor between each
control unit and
Subaru Select
Monitor.
Go to step 8. Repair the har-
ness and connec-
tor between each
control unit and
Subaru Select
Monitor.
Go to step 9. Repair the har-
ness and connec-
tor between body
integrated unit and
Subaru Select
Monitor.
Go to step 10. Insert the body
integrated unit
connector into
body integrated
unit.
No