Subaru 2009 IMPREZA Service Manual page 2865

AIRBAG SYSTEM (DIAGNOSTICS)
Step
3 CHECK AIRBAG REAR HARNESS (PRE-
TENSIONER HARNESS LH).
1) Turn the ignition switch to OFF, disconnect
the ground cable from battery, and wait for 20
seconds or more.
2) Disconnect the airbag resistor from test har-
ness.
3) Disconnect connector (AB19) from side air-
bag module (LH).
4) Disconnect the connector (AB31) from cur-
tain airbag module (LH).
5) Disconnect the connectors (AB6, AB17,
AB18) from airbag control module.
6) Connect the test harness AG connector
(1AG) to the connectors (AB6, AB17, AB18).
7) Measure the resistance between connector
(3AG) in the test harness AG and connector
(2N) in the test harness N.
Connector & terminal
(3AG) No. 12 — (2N) No. 2:
(3AG) No. 10 — (2N) No. 1:
4 CHECK AIRBAG REAR HARNESS (PRE-
TENSIONER HARNESS LH).
Measure the resistance between connector
(3AG) terminals in the test harness AG.
Connector & terminal
(3AG) No. 10 — (3AG) No. 12:
5 CHECK AIRBAG REAR HARNESS (PRE-
TENSIONER HARNESS LH).
Measure the resistance between connector
(3AG) in the test harness AG and chassis
ground.
Connector & terminal
(3AG) No. 10 — Chassis ground:
(3AG) No. 12 — Chassis ground:
6 CHECK AIRBAG CONTROL MODULE.
1) Connect all connectors.
2) Clear the memory.
3) Perform the Inspection Mode.
4) Read the DTC.
7 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 4.
Is the resistance 1 M or
more?
Is the resistance 1 M or
more?
Is the same DTC displayed?
AB(diag)-76
Check Yes
Go to step 5.
Go to step 6.
Replace the airbag
control module.
<Ref. to AB-21,
Airbag Control
Module.>
Check DTC using
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
AB(diag)-38, List
of Diagnostic Trou-
ble Code (DTC).>
No
Replace the airbag
rear harness along
with body harness.
Replace the airbag
rear harness along
with body harness.
Replace the airbag
rear harness along
with body harness.
Go to step 7.
Finish the diagno-
sis.