Subaru 2009 IMPREZA Service Manual page 2817

AIRBAG SYSTEM (DIAGNOSTICS)
Step
9 CHECK OUTPUT SIGNAL TO THE AIRBAG
CONTROL MODULE.
1) Turn the ignition switch to ON in the condi-
tion of step 8.
2) Measure the voltage between data link con-
nector and chassis ground.
Connector & terminal
(B40) No. 7 (+) — Chassis ground (–):
10 CHECK THE HARNESS BETWEEN THE AIR-
BAG CONTROL MODULE AND DATA LINK
CONNECTOR.
1) Turn the ignition switch to OFF, disconnect
the ground cable from battery, and wait for 20
seconds or more.
2) Disconnect the connectors (AB6, AB17,
AB18) from airbag control module.
3) Connect the test harness AG connector
(1AG) to the connectors (AB6, AB17, AB18).
4) Measure the resistance between connector
(4AG) in the test harness AG and the data link
connector.
Connector & terminal
(4AG) No. 1 — (B40) No. 7:
11 CHECK POWER SUPPLY CIRCUIT.
1) Turn the ignition switch to ON.
2) Measure the voltage between connector
(2AG) in the test harness AG and chassis
ground.
Connector & terminal
(2AG) No. 1 — Chassis ground:
12 CHECK BETWEEN THE AIRBAG CONTROL
MODULE AND CHASSIS GROUND.
1) Turn the ignition switch to OFF.
2) Measure the resistance between connector
(2AG) in the test harness AG and chassis
ground.
Connector & terminal
(2AG) No. 4 — Chassis ground:
(2AG) No. 3 — Chassis ground:
13 CHECK POOR CONTACT OF CONNECTOR. Is there poor contact of the con-
Subaru Select Monitor
Check
Is the voltage less than 1 V?
Is the resistance less than 10 ? Go to step 11.
Is the voltage 10 V or more?
Is the resistance less than 10 ? Go to step 13.
trol module power supply,
ground circuit and data link con-
nector?
AB(diag)-28
Yes No
Go to step 10. Repair the harness
and connector
between each con-
trol module and
data link connec-
tor. (Replace the
entire harness if
repair is necessary
for airbag har-
ness.)
Repair the harness
between the airbag
control module and
the data link con-
nector. Or replace
the airbag main
harness along with
the bulkhead har-
ness.
Go to step 12. Repair the harness
between the airbag
control module and
the battery. Or
replace the airbag
main harness
along with the bulk-
head harness.
Repair the harness
between the airbag
control module and
the chassis
ground. Or replace
the airbag main
harness along with
the bulkhead har-
ness.
Repair the connec- Replace the airbag
tor. (For airbag control module.
system connec- <Ref. to AB-21,
tors, do not repair REMOVAL, Airbag
but replace the Control Module.>
entire harness.)