Subaru Impreza 2003 Service Manual page 2868

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AIRBAG SYSTEM (DIAGNOSTICS)
Step
1 CHECK DRIVER'S AIRBAG MODULE.
1)Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2)Remove the driver's airbag module. <Ref. to
AB-12, Driver's Airbag Module.>
3)Connect the connector (1N) in test harness
N to connector (AB2).
4)Connect the airbag resistor to connector
(2N) in test harness N.
5)Connect the battery ground cable and turn
the ignition switch to ON.
2 CHECK ROLL CONNECTOR.
1)Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 second.
2)Disconnect the test harness N from the con-
nector (AB2).
3)Remove the instrument panel lower cover,
disconnect the connector (AB26) from (AB21)
and connect the connector (1F) in test harness
F to connector (AB21).
4)Connect the airbag resistor to connector (3F)
in test harness F.
5)Connect the battery ground cable and turn
the ignition switch to ON.
3 CHECK AIRBAG MAIN HARNESS.
1)Turn the ignition switch to OFF, disconnect
the ground cable, and wait more than 20 sec-
onds.
2)Disconnect the airbag resistor from the con-
nector (3F) in test harness F.
3)Remove the glove box, <Ref. to AB-13, Pas-
senger's Airbag Module.> and disconnect con-
nectors (AB27) and (AB4).
4)Disconnect the connector (AB3) from the air-
bag control module, and connect the connector
(1R) in test harness R. <Ref. to AB-16, Airbag
Control Module.>
5)Measure the resistance between connector
(2R) in test harness R and the connector (3F)
in test harness F.
Connector & terminal
(2R) No. 2 — (3F) No. 4:
(2R) No. 4 — (3F) No. 3:
4 CHECK AIRBAG MAIN HARNESS.
Measure the resistance of the connector (2R)
in test harness R.
Connector & terminal
(2R) No. 2 — (2R) No. 4:
(2R) No. 4 — Chassis ground:
(2R) No. 2 — Chassis ground:
Check
Does the airbag warning light
operate properly?
Does the airbag warning light
operate properly?
Is the resistance less than 10
Ω?
Is the resistance more than 1
MΩ?
AB-42
Yes
Replace the Go to step 2.
driver's airbag
module. <Ref. to
AB-12, Driver's
Airbag Module.>
Replace the roll Go to step 3.
connector. <Ref.
to AB-18, Roll
Connector.>
Go to step 4. Replace the body
harness with air-
bag main harness.
Replace the airbag Replace the body
control module. harness with air-
<Ref. to AB-16, bag main harness.
Airbag Control
Module.>
No