Subaru IMPREZA GD 2007 Series Manual page 3633

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AIRBAG SYSTEM (DIAGNOSTICS)
Step
1 CHECK POOR CONTACT OF CONNECTORS.
Check for poor contact of the connectors
between the airbag control module, side airbag
module (LH) and the side airbag sensor (LH).
2 CHECK SIDE AIRBAG HARNESS (LH).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Disconnect connector (AB19) from seat belt
pretensioner (LH).
3) Disconnect connector (AB9) from side air-
bag module (LH).
4) Disconnect the connector (AB7) from airbag
control module.
5) Connect the connector (1R) in the test har-
ness R to connector (AB7).
6) Disconnect the connector (AB10) from side
airbag sensor (LH), and connect connector (2V)
in test harness V to connector (AB10).
7) Measure resistance between connector
(4R) in the test harness R and connector (3V) in
the test harness V.
Connector & terminal
(4R) No. 4 — (3V) No. 2:
(4R) No. 3 — (3V) No. 4:
(4R) No. 2 — (3V) No. 1:
(4R) No. 1 — (3V) No. 5:
3 CHECK SIDE AIRBAG HARNESS (LH).
Measure resistance between connector (4R)
terminals in the test harness R, and the resis-
tance between connector (4R) in the test har-
ness R and chassis ground.
Connector & terminal
(4R) No. 4 — (4R) No. 3:
(4R) No. 4 — (4R) No. 2:
(4R) No. 4 — (4R) No. 1:
(4R) No. 3 — (4R) No. 2:
(4R) No. 3 — (4R) No. 1:
(4R) No. 2 — (4R) No. 1:
(4R) No. 4 — Chassis ground:
(4R) No. 3 — Chassis ground:
(4R) No. 2 — Chassis ground:
(4R) No. 1 — Chassis ground:
4 CHECK AIRBAG CONTROL MODULE.
1) Connect all connectors.
2) Erase 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 there poor contact?
Is the resistance less than 10
Ω?
Is the resistance 1 MΩ or
more?
Is the same DTC displayed?
AB(diag)-90
Check Yes
Replace the side
airbag harness
(LH) along with
body harness.
Go to step 3.
Go to step 4.
Replace the side air-
bag sensor (LH).
<Ref. to AB-18, Side
Airbag Sensor.>
Replace the airbag
control module if not
operating normally
even after replacing
the sensor. <Ref. to
AB-17, Airbag Con-
trol Module.>
Check DTC using
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
AB(diag)-43, List
of Diagnostic Trou-
ble Code (DTC).>
No
Go to step 2.
Replace the side
airbag harness
along with the body
harness.
Replace the side
airbag harness
along with the body
harness.
Go to step 5.
Finish the diagno-
sis.