Subaru Legacy 2005 Service Manual page 3674

AIRBAG SYSTEM (DIAGNOSTICS)
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.
3) Connect the connector (AB38) to the con-
nector (1N) in the test harness N.
4) Connect the airbag resistor to connector
(2N) in the test harness N.
5) Connect the connector (1Q) in the test har-
ness Q to connector (AB37).
6) Connect the airbag resistor to connector
(2Q) in the test harness Q.
7) Connect the battery ground cable and turn
the ignition switch to 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 N from con-
nector (AB38).
3) Disconnect the test harness Q from con-
nector (AB37).
4) Remove the instrument panel lower cover
and disconnect the connector (AB7) from
(AB2).
5) Connect the connector (1P) in the test har-
ness P to connector (AB2).
6) Connect the airbag resistor to connectors
(2P) and (3P) in the test harness P.
7) Connect the battery ground cable and turn
the ignition switch to ON.
3 CHECK AIRBAG MAIN HARNESS (DRIV-
ER'S AIRBAG HARNESS).
1) Turn the ignition switch OFF, disconnect the
battery ground cable, and wait more than 20
seconds.
2) Disconnect the airbag resistor from con-
nectors (2P) and (3P) in the test harness P.
3) Remove the instrument panel side cover on
passenger's side and disconnect the connec-
tors (AB10) and (AB9).
4) Disconnect the connector (AB6) from air-
bag control module, and connect the connector
(1U) in the test harness U.
5) Connect the battery ground cable and turn
the ignition switch to ON. (engine OFF)
6) Measure the resistance between connector
(2U) in the test harness U and chassis ground.
Connector & terminal
(2U) No. 4 (+) — Chassis ground (
(2U) No. 2 (+) — Chassis ground (
(2U) No. 8 (+) — Chassis ground (
(2U) No. 12 (+) — Chassis ground (
Diagnostic Chart with Trouble Code
Does the airbag warning light
illuminate for 6 seconds and go
off?
Does the airbag warning light
illuminate for 6 seconds and go
off?
Is the voltage less than 1 V?
−
):
−
):
−
):
−
):
AB(diag)-102
Check
Replace the
driver's airbag
module. <Ref. to
AB-16, Driver's
Airbag Module.>
Replace the roll
connector. <Ref. to
AB-25, Roll Con-
nector.>
Replace the airbag
control module.
<Ref. to AB-22,
Airbag Control
Module.>
Yes No
Go to step 2.
Go to step 3.
Replace the airbag
main harness with
body harness.