Subaru Legacy 2004 Service Manual page 3590

AIRBAG SYSTEM (DIAGNOSTICS)
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 (1N) in the test har-
ness N to connector (AB38).
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). <Ref. to AB-15, Passen-
ger's Airbag Module.>
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) Measure the resistance between connector
(2U) in the test harness U and connector (2P)
and (3P) in the test harness P.
Connector & terminal
(2U) No. 2 — (2P) No. 1:
(2U) No. 4 — (2P) No. 2:
(2U) No. 8 — (3P) No. 3:
(2U) No. 12 — (3P) No. 4:
Diagnostic Chart with Trouble Code
Does the airbag warning light
operate properly?
Does the airbag warning light
operate properly?
Is the resistance less than 10
"?
AB(diag)-100
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.>
Go to step 4.
No
Go to step 2.
Go to step 3.
Replace the airbag
main harness with
body harness.