Subaru Legacy 2003 Service Manual page 3620

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
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.
Does the airbag warning light operate prop-
erly?
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.
Does the airbag warning light operate prop-
erly?
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
connector (1I) in test harness I2. <Ref. to
AB-17, REMOVAL, Airbag Control Mod-
ule.>
5) Connect the battery ground cable and turn
the ignition switch ON. (Engine OFF)
6) Measure the voltage between connector
(2I) in test harness I2 and the chassis
ground.
Connector & terminal
(2I) No. 4 (+) — Chassis ground ( − − − − ):
(2I) No. 1 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
Value
Operates properly.
Operates properly.
1 V
AB-37
AIRBAG SYSTEM (DIAGNOSTICS)
Yes
Replace the Go to step 2.
driver's airbag
module. <Ref. to
AB-12,
REMOVAL,
Driver's Airbag
Module.>
Replace the roll Go to step 3.
connector. <Ref.
to AB-19,
REMOVAL, Roll
Connector.>
Replace the airbag Replace airbag
control module. main harness.
<Ref. to AB-17, <Ref. to AB-15,
REMOVAL, Air- REMOVAL, Main
bag Control Mod- Harness.>
ule.>
No