Subaru 2009 IMPREZA Service Manual page 2893

AIRBAG SYSTEM (DIAGNOSTICS)
Step
2 CHECK AIRBAG MAIN HARNESS (FRONT
SENSOR BUS LH).
1) Turn the ignition switch to OFF, disconnect
the ground cable from battery, and wait for 20
seconds or more.
2) Remove the instrument panel lower cover
and disconnect the connectors (AB7) and
(AB2).
3) Remove the console front panel and discon-
nect the connectors (AB9) and (AB10).
4) Disconnect the connectors (AB17, AB6,
AB18) from airbag control module.
5) Connect the connector (1AG) in the test har-
ness AG to the connectors (AB17, AB6, AB18).
6) Disconnect the front sub sensor (LH), and
then connect the connector (1H) in the test har-
ness H to connector (AB13).
7) Measure the resistance between connector
(4AG) in the test harness AG and connector
(3H) in the test harness H.
Connector & terminal
(4AG) No. 7 — (3H) No. 5:
(4AG) No. 9 — (3H) No. 6:
3 CHECK AIRBAG MAIN HARNESS (FRONT
SENSOR BUS LH).
Measure the resistance between connector
(4AG) in the test harness AG and chassis
ground, and the resistance between connector
(4AG) in the test harness AG and connector
(3H) in test harness H.
Connector & terminal
(4AG) No. 7 — Chassis ground:
(4AG) No. 9 — Chassis ground:
(4AG) No. 7 — (4AG) No. 9:
4 CHECK AIRBAG CONTROL MODULE.
1) Connect all connectors.
2) Clear the memory.
3) Perform the Inspection Mode.
4) Read the DTC.
5 CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
Diagnostic Chart with Trouble Code
Is the resistance less than 10 ? Go to step 3.
Is the resistance 1 M or
more?
Is the same DTC displayed?
AB(diag)-104
Check Yes
Go to step 4.
Replace the front
sub sensor (LH).
<Ref. to AB-22,
REMOVAL, Front
Sub Sensor.>
Replace the airbag
control module if
not operating nor-
mally even after
replacing the sen-
sor. <Ref. to AB-
21, REMOVAL, Air-
bag Control Mod-
ule.>
Check DTC using
"List of Diagnostic
Trouble Code".
<Ref. to AB(diag)-
38, LIST, List of
Diagnostic Trouble
Code (DTC).>
No
Replace the airbag
main harness
along with body
harness.
Replace the airbag
main harness
along with body
harness.
Go to step 5.
Finish the diagno-
sis.