Subaru Impreza 2003, Service Manual

Page: 2872 / 3610

AB-46
AIRBAG SYSTEM (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step Check Yes No
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.
Does the airbag warning light
operate properly? Replace the
driver's airbag
module. <Ref. to
AB-12, Driver’s
Airbag Module.> Go to step 2.
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.
Does the airbag warning light
operate properly? Replace the roll
connector. <Ref.
to AB-18, Roll
Connector.> Go to step 3.
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 (
−−−−
):
Is the voltage less than 1 V? Replace the airbag
control module.
<Ref. to AB-16,
Airbag Control
Module.> Replace the body
harness with air-
bag main harness.