Subaru Legacy 2002 Service Manual page 3278

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK AIRBAG CONTROL MODULE.
1) Turn the ignition switch OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the connector (AB6) from air-
bag control module. <Ref. to AB-17, Airbag
Control Module.>
3) Connect the connector (1I) in test harness I
or I2 to connector (AB6).
4) Connect the battery ground cable, and turn
the ignition switch ON.
5) Measure the voltage between the connec-
tor (2I) in test harness I or I2 and the chassis
ground.
Connector & terminal
(2I) No. 6 (+) — Chassis ground (−):
2 CHECK AIRBAG MAIN HARNESS.
1) While checking control module, turn the
ignition switch OFF and disconnect the bat-
tery ground cable. Wait more than 20 seconds
before operation.
2) Disconnect the airbag connector (AB1)
from the body harness (B31).
3) Connect the connector (2A) in test harness
A to the airbag connector (AB1).
4) Measure the resistance between the con-
nector (5A) in test harness A and the connec-
tor (2I) in test harness I or I2.
Connector & terminal
(5A) No. 1 — (2I) No. 6:
3 CHECK AIRBAG MAIN HARNESS.
Measure the following resistance with the
above-metioned condition maintained.
Connector & terminal
(5A) No. 1 — Chassis ground:
(2I) No. 6 — Chassis ground:
4 CHECK FUSE NO. 6 (IN JOINT BOX).
1) Confirm that the ignition switch is turned
OFF.
2) Remove No. 6 fuse (in joint box) and per-
form visual inspection.
Step
Is the voltage more than 10
V?
Is the resistance less than
10 Ω?
Is the resistance more than
1 MΩ?
Is fuse No. 6 blown?
AB-49
Airbag System (Diagnostics)
Check Yes
Replace the air-
bag control mod-
ule. <Ref. to
AB-17, Airbag
Control Module.>
Go to step 3.
Go to step 4.
Replace fuse No.
6. If fuse No. 6 is
blown again,
repair the body
harness.
No
Go to step 2.
Replace the air-
bag main har-
ness. <Ref. to
AB-15, Main Har-
ness.>
Replace the air-
bag main har-
ness. <Ref. to
AB-15, Main Har-
ness.>
Repair the body
harness.