Subaru 2009 IMPREZA Service Manual page 2844

Step
1 CHECK POOR CONTACT OF CONNEC-
TORS.
Check for poor contact of the connectors
between the airbag control module and the pas-
senger's airbag module.
2 CHECK PASSENGER'S AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the ground cable from battery, and wait for 20
seconds or more.
2) Remove the console front panel and discon-
nect the connectors (AB10) from (AB9).
3) Connect the connector (1P) in the test har-
ness P to connector (AB9).
4) Connect the airbag resistor to the connec-
tors (2P) and (3P) of test harness P.
5) Connect the battery ground terminal and
turn the ignition switch to ON.
3 CHECK AIRBAG MAIN HARNESS (PASSEN-
GER'S AIRBAG HARNESS).
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 the con-
nectors (2P) and (3P) of test harness P.
3) Remove the instrument panel lower cover
and disconnect the connector (AB7) from
(AB2).
4) Disconnect the connectors (AB6, AB17,
AB18) from the airbag control module, and con-
nect the test harness AG connector (1AG).
5) Connect the battery ground terminal and
turn the ignition switch to ON. (engine OFF)
6) Measure the voltage between connector
(3AG) in the test harness AG and chassis
ground.
Connector & terminal
(3AG) No. 9 (+) — Chassis ground (–):
(3AG) No. 7 (+) — Chassis ground (–):
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 there poor contact?
Does the airbag warning light
illuminate for 6 seconds and go
off?
Is the voltage less than 1 V?
Is the same DTC displayed?
AB(diag)-55
AIRBAG SYSTEM (DIAGNOSTICS)
Check Yes
Replace the airbag
harness along with
chassis harness.
Replace the pas-
senger's airbag
module. <Ref. to
AB-16, Passen-
ger's Airbag Mod-
ule.>
Go to step 4.
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
Go to step 2.
Go to step 3.
Replace the airbag
main harness
along with body
harness.
Go to step 5.
Finish the diagno-
sis.