Subaru Legacy 2004 Service Manual page 4144

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
S: DTC B0301 CAN-LS COUNTER ABNORMAL
DTC DETECTING CONDITION:
Locate the unit which trouble occurs, open or short in CAN line, and repair and replace it.
(Free running counter error may be detected at the same time from the unit which the malfunction occurs.)
TROUBLE SYMPTOM:
"Er LC" is displayed in odo/trip meter.
Step
1 CHECK CENTER DISPLAY.
1) Display the accelerator opening angle in
the meter on "Information" of center display
menu.
2) Read the display when the accelerator
opening angle is fully opened from fully closed.
2 CHECK AUTO A/C CONTROL UNIT.
1) Display the current data of body integrated
unit using Subaru Select Monitor.
2) Display the number of blower fan level in
the analog data.
3) Read the data display when the blower fan
level is changed on air conditioner control part.
3 CHECK COMBINATION METER.
1) Display the current data of body integrated
unit using Subaru Select Monitor.
2) Display the door switch in analog data.
3) Read the display of data and combination
meter when each door is opened/closed.
4 CHECK CENTER DISPLAY HARNESS.
1) Disconnect the center display harness con-
nector and CAN joint connector.
2) Measure the resistance between harness
connectors.
Connector & terminal
(i90) No. 14 — (i77) No. 1:
(i90) No. 6 — (i77) No. 5:
5 CHECK AUTO A/C CONTROL UNIT HAR-
NESS.
1) Disconnect the auto A/C control module
connector.
2) Disconnect the body integrated unit con-
nector.
3) Measure the resistance of harness
between body integrated unit and auto A/C
control unit.
Connector & terminal
(B280) No. 26 — (B283) No. 1:
(B280) No. 25 — (B283) No. 11:
6 CHECK COMBINATION METER HARNESS.
1) Disconnect the combination meter connec-
tor.
2) Disconnect the body integrated unit con-
nector.
3) Measure the resistance between body inte-
grated unit and combination meter connector.
Connector & terminal
(i84) No. 26 — (i10) No. 22:
(i84) No. 27 — (i10) No. 21:
Check
Does the value changed from 0
to 100?
Does the data display change? Go to step 3.
Does the indicator of data and
combination meter on body
integrated unit change accord-
ing to operation?
Is the resistance less than 10
"?
Is the resistance less than 10
"?
Is the resistance less than 10
"?
LAN(diag)-68
Yes
Go to step 2. Go to step 7.
Go to step 5.
Go to step 4. Go to step 6.
Go to step 7. Repair or replace
the open circuit of
harness.
Go to step 8. Repair or replace
the open circuit of
harness.
Go to step 9. Repair or replace
the open circuit of
harness.
No