Subaru Impreza 2003 Service Manual page 2878

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AIRBAG SYSTEM (DIAGNOSTICS)
Step
1 CHECK AIRBAG CONTROL MODULE.
1)Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2)Disconnect the connector (AB3) from the air-
bag control module. <Ref. to AB-16, Airbag
Control Module.>
3)Connect the connector (1R) in test harness
R to connector (AB3).
4)Connect the battery ground cable and turn
the ignition switch to ON.
5)Measure the voltage between connector
(2R) in test harness R and chassis ground.
Connector & terminal
(2R) No. 1 (+) — Chassis ground ( − − − − ):
2 CHECK AIRBAG MAIN HARNESS.
1)While checking control module, turn the igni-
tion switch to OFF and disconnect the battery
ground cable. Wait more than 20 seconds
before operation.
2)Disconnect the airbag connector (AB1) from
the body harness (B31).
3)Connect the connector (2M) in test harness
M to connector (AB1).
4)Measure the resistance between connector
(5M) in test harness M and the connector (2R)
in test harness R.
Connector & terminal
LHD MODEL:
(5M) No. 2 — (2R) No. 1:
RHD MODEL:
(5M) No. 9 — (2R) No. 1:
3 CHECK AIRBAG MAIN HARNESS.
Measure the following resistance with the
above-mentioned condition maintained.
Connector & terminal
LHD MODEL:
(5M) No. 2 — Chassis ground:
(2R) No. 1 — Chassis ground:
RHD MODEL:
(5M) No. 9 — Chassis ground:
(2R) No. 1 — Chassis ground:
4 CHECK FUSE No. 11 (IN JOINT BOX).
1)Confirm that the ignition switch is turned
OFF.
2)Remove the fuse No. 11 (in joint box) and
perform visual inspection.
Check
Is the voltage more than 10 V? Replace the airbag
Is the resistance less than 10
Ω?
Is the resistance more than 1
MΩ?
Is the fuse No. 11 blown out?
AB-52
Yes
Go to step 2.
control module.
<Ref. to AB-16,
Airbag Control
Module.>
Go to step 3. Replace the body
harness with air-
bag main harness.
Go to step 4. Replace the body
harness with air-
bag main harness.
Replace the fuse Repair the body
No. 11. If fuse No. harness.
11 is blown out
again, repair the
body harness.
No