Subaru Legacy 2004 Service Manual page 3537

Step
1 CHECK DRIVER'S AIRBAG MODULE.
1) Turn the ignition switch OFF, disconnect the
battery ground terminal, and wait more than 20
seconds.
2) Remove the driver's airbag module. <Ref.
to AB-14, Driver's Airbag Module.>
3) Connect the connector (AB38) to connector
(1N) in the test harness N.
4) Connect the airbag resistor to connector
(2N) in the test harness N.
5) Connect the connectors (1Q) in the test
harness Q to connector (AB37).
6) Connect the airbag resistor to connector
(2Q) in the test harness Q.
7) Connect the battery ground terminal and
turn the ignition switch ON.
2 CHECK ROLL CONNECTOR.
1) Turn the ignition switch OFF, disconnect the
battery ground terminal, 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,
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 connector
(2P) and (3P) in the test harness P.
7) Connect the battery ground terminal and
turn the ignition switch ON.
3 CHECK AIRBAG MAIN HARNESS (DRIV-
ER'S AIRBAG HARNESS).
1) Turn the ignition switch OFF, disconnect the
battery ground terminal, and wait more than 20
seconds.
2) Disconnect the airbag resistor from con-
nector (2P) and (3P) in the test harness P.
3) Remove the instrument panel side cover of
passenger's side and disconnect the connector
(AB10) and (AB9).
4) Disconnect the connector (AB6) from air-
bag control module, and connect the connector
(1U) in the test harness U. <Ref. to AB-20, Air-
bag Control Module.>
5) Connect the battery ground terminal and
turn the ignition switch ON. (engine OFF)
6) Measure the voltage 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
operate properly?
Does the airbag warning light
operate properly?
Is the voltage less than 1 V?
#
):
#
):
#
):
#
):
AB(diag)-47
AIRBAG SYSTEM (DIAGNOSTICS)
Check Yes
Replace the
driver's airbag
module. <Ref. to
AB-14, Driver's
Airbag Module.>
Replace the roll
connector. <Ref. to
AB-23, Roll Con-
nector.>
Replace the airbag
control module.
<Ref. to AB-20,
Airbag Control
Module.>
No
Go to step 2.
Go to step 3.
Replace the airbag
main harness with
body harness.