Subaru Legacy 2002 Service Manual page 3270

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK DRIVER'S AIRBAG MODULE.
1) Turn the ignition switch OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Remove the driver's airbag module. <Ref.
to AB-12, REMOVAL, Driver's Airbag Mod-
ule.>
3) Connect the connector (AB7) to connector
(1F) in test harness F.
4) Connect the airbag resistor to connector
(3F) in test harness F.
5) Connect the battery ground cable and turn
the ignition switch ON.
2 CHECK ROLL CONNECTOR.
1) Turn the ignition switch OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the test harness from the con-
nector (AB7).
3) Remove the lower cover panel and discon-
nect the connector (AB3) from (AB8).
4) Connect the connector (1F) in test harness
F to connector (AB8).
5) Connect the airbag resistor to connector
(3F) in test harness F.
6) Connect the battery ground cable and turn
the ignition switch ON.
3 CHECK AIRBAG MAIN HARNESS.
1) Turn the ignition switch OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the airbag resistor from the
connector (3F) in test harness F.
3) Pull out the two stopper pins and lower the
glove box, and disconnect connectors (AB10)
and (AB9).
4) Disconnect the connector (AB6) from the
airbag control module, and connect the con-
nector (1I) in test harness I or I2. <Ref. to
AB-17, Airbag Control Module.>
5) Connect the battery ground cable and turn
the ignition switch ON. (Engine OFF)
6) Measure the voltage between connector
(2I) in test harness I or I2 and the chassis
ground.
Connector & terminal
(2I) No. 4 (+) — Chassis ground (−):
(2I) No. 1 (+) — Chassis ground (−):
Step
Does the airbag warning
light operate properly?
Does the airbag warning
light operate properly?
Is the voltage less than
1 V?
AB-41
Airbag System (Diagnostics)
Check Yes
Replace the driv-
er's airbag mod-
ule. <Ref. to
AB-12, Driver's
Airbag Module.>
Replace the roll
connector. <Ref.
to AB-19, Roll
Connector.>
Replace the air-
bag control mod-
ule. <Ref. to
AB-17, Airbag
Control Module.>
No
Go to step 2.
Go to step 3.
Replace airbag
main harness.
<Ref. to AB-15,
Main Harness.>