Subaru Legacy 2004 Service Manual page 3524

AIRBAG SYSTEM (DIAGNOSTICS)
Step
1 CHECK POOR CONTACT.
1) Turn the ignition switch OFF, disconnect the
battery ground terminal, and wait more than 20
seconds.
2) Confirm that the firm contact is secured
between the airbag control module and con-
nector (AB6). <Ref. to AB-20, Airbag Control
Module.>
2 CHECK AIRBAG MAIN HARNESS.
1) Remove the instrument panel lower cover
and disconnect the connector (AB7) and
(AB2).
2) Remove the instrument panel side cover of
passenger side and disconnect the connector
(AB10) and (AB9).
3) 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.>
4) Connect the battery ground terminal and
turn the ignition switch ON.
5) Connect the connectors (7U) and (8U) in
the test harness U.
NOTE:
After problem has been eliminated, disconnect
the connectors (7U) and (8U).
3 CHECK GROUND CIRCUIT.
1) Turn the ignition switch OFF, disconnect the
battery ground terminal, and wait more than 20
seconds.
2) Disconnect the connector (AB6) from air-
bag control module.
3) Connect the connector (1U) in the test har-
ness U to body harness connector (AB6).
4) Measure the resistance between connector
(2U) in the test harness U and chassis ground.
Connector & terminal
(2U) No. 10 — Chassis ground:
(2U) No. 11 — Chassis ground:
4 CHECK AIRBAG MAIN HARNESS AND
BODY HARNESS.
1) Disconnect the connector (7U) and (8U).
2) Remove the combination meter.
3) Measure the resistance between connector
(i10) and connector (2U) in the test harness U.
Connector & terminal
(2U) No. 7 — (i10) No. 13:
5 CHECK POOR CONTACT IN CONNECTORS
(AB1) AND (B31).
1) Turn the ignition switch OFF, disconnect the
battery ground terminal, and wait more than 20
seconds.
2) Confirm that firm contact is secured
between connectors (AB1) and (B31).
6 CHECK AIRBAG MAIN HARNESS.
Check the airbag main harness for abnormali-
ties.
Airbag Warning Light Failure
Is there poor contact in con-
nector (AB6)?
Does the airbag warning light
go off?
Is the resistance less than 10
"?
Is the resistance less than 10
"?
Is there poor contact in con-
nectors (AB1) and (B31)?
Is anything unusual to airbag
main harness?
AB(diag)-34
Check Yes
Replace the airbag
main harness with
body harness or
replace the airbag
control module.
<Ref. to AB-20,
Airbag Control
Module.>
Go to step 3.
Replace the airbag
control module.
<Ref. to AB-20,
Airbag Control
Module.>
Replace the com-
bination meter
printed circuit.
<Ref. to IDI-16,
Combination
Meter Assembly.>
Repair the body
harness or replace
the airbag main
harness with body
harness.
Replace the airbag
main harness with
body harness.
No
Go to step 2.
Go to step 4.
Repair the chas-
sis ground circuit.
Go to step 5.
Go to step 6.
Repair the body
harness.