Subaru Impreza 2003 Service Manual page 2882

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AIRBAG SYSTEM (DIAGNOSTICS)
Step
1 CHECK FRONT SUB-SENSOR (RH) AND
FRONT SUB-SENSOR HARNESS (RH).
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, and connect the connector
(1R) in test harness R. <Ref. to AB-16, Airbag
Control Module.>
3)Measure the resistance of the connector
(3R) in test harness R.
Connector & terminal
(3R) No. 7 — (3R) No. 9:
2 CHECK FRONT SUB-SENSOR (RH) AND
FRONT SUB-SENSOR HARNESS (RH).
Measure the resistance between connector
(3R) in test harness R and the chassis ground.
Connector & terminal
(3R) No. 7 — Chassis ground:
(3R) No. 9 — Chassis ground:
3 CHECK AIRBAG MAIN HARNESS AND
FRONT SUB-SENSOR HARNESS (RH).
1)Disconnect the connector (AB15) from the
front sub-sensor. <Ref. to AB-19, Front Sub
Sensor.>
2)Connect the connector (1H) in test harness
H to connector (AB15).
3)Measure the resistance between connector
(3R) in test harness R and connector (3H) in
test harness H.
Connector & terminal
(3R) No. 7 — (3H) No. 5:
(3R) No. 9 — (3H) No. 6:
4 CHECK AIRBAG MAIN HARNESS AND
FRONT SUB-SENSOR HARNESS (RH).
Measure the resistance between connector
(3R) in test harness R and the chassis ground.
Connector & terminal
(3R) No. 7 — Chassis ground:
(3R) No. 9 — Chassis ground:
5 CHECK AIRBAG MAIN HARNESS
1)Disconnect the connector (AB14) from
(AB13), and connect the connector (1F) in test
harness F to connector (AB13).
2)Measure the resistance between connector
(3R) in test harness R and connector (3F) in
test harness F.
Connector & terminal
(3R) No. 7 — (3F) No. 4:
(3R) No. 9 — (3F) No. 3:
6 CHECK AIRBAG MAIN HARNESS
Measure the resistance between connector
(3R) in test harness R and the chassis ground.
Connector & terminal
(3R) No. 7 — Chassis ground:
(3R) No. 9 — Chassis ground:
Check
Is the resistance 750 Ω — 1
kΩ?
Is the resistance more than 1
MΩ?
Is the resistance less than 10
Ω?
Is the resistance more than 1
MΩ?
Is the resistance less than 10
Ω?
Is the resistance more than 1
MΩ?
AB-56
Yes
Replace the airbag Go to step 2.
control module.
<Ref. to AB-16,
Airbag Control
Module.>
Replace the airbag Go to step 3.
control module.
<Ref. to AB-16,
Airbag Control
Module.>
Go to step 4. Go to step 5.
LHD model: LHD model:
Finish the diagno- Replace the front
sis. sub-sensor
RHD model: (RH).<Ref. to AB-
Go to step 9. 19, Front Sub Sen-
sor.>
RHD model:
Go to step 5.
Go to step 6. Replace the body
harness with air-
bag main harness.
Go to step 7. Replace the body
harness with air-
bag main harness.
No