Subaru Impreza 2003 Service Manual page 2872

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 (AB2) to connector
(1N) in test harness N.
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 seconds.
2)Disconnect the test harness N from the con-
nector (AB2).
3)Remove the instrument panel lower cover
panel and disconnect the connector (AB26)
from (AB21).
4)Connect the connector (1F) in test harness F
to connector (AB21).
5)Connect the airbag resistor to connector (3F)
in test harness F.
6)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 battery ground cable, and wait more than
20 seconds.
2)Disconnect the airbag resistor from the con-
nector (3F) in test harness F.
3)Remove the glove box, and disconnect the
connectors (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)Connect the battery ground cable and turn
the ignition switch to ON. (engine OFF)
6)Measure the voltage between connector
(2R) in test harness R and the chassis ground.
Connector & terminal
(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 voltage less than 1 V?
AB-46
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.>
Replace the airbag Replace the body
control module. harness with air-
<Ref. to AB-16, bag main harness.
Airbag Control
Module.>
No