Subaru 2009 IMPREZA Service Manual page 2841

AIRBAG SYSTEM (DIAGNOSTICS)
Step
1 CHECK POOR CONTACT OF CONNEC-
TORS.
Check for poor contact of the connectors
between the airbag control module and the
driver's airbag module.
2 CHECK DRIVER'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 driver's airbag module.
3) Connect the connector (AB38) to the con-
nector (1N) in the test harness N.
4) Connect the airbag resistor to the connector
(2N) of test harness N.
5) Connect the connector (1Q) in the test har-
ness Q to connector (AB37).
6) Connect the airbag resistor to the connector
(2Q) in the test harness Q.
7) Connect the battery ground terminal and
turn the ignition switch to ON.
3 CHECK ROLL CONNECTOR.
1) Turn the ignition switch to OFF, disconnect
the ground cable from battery, and wait for 20
seconds or more.
2) Disconnect the test harness N from connec-
tor (AB38).
3) Disconnect the test harness Q from connec-
tor (AB37).
4) Remove the instrument panel lower cover
and disconnect the connector (AB7) from
(AB2).
5) Connect the connector (1P) in the test har-
ness P to connector (AB2).
6) Connect the airbag resistor to the connec-
tors (2P) and (3P) of test harness P.
7) Connect the battery ground terminal and
turn the ignition switch to ON.
4 CHECK AIRBAG MAIN HARNESS (DRIV-
ER'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 console front panel and discon-
nect the connectors (AB10) and (AB9).
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. 3 (+) — Chassis ground (–):
(3AG) No. 1 (+) — Chassis ground (–):
Diagnostic Chart with Trouble Code
Is there poor contact?
Does the airbag warning light
illuminate for 6 seconds and go
off?
Does the airbag warning light
illuminate for 6 seconds and go
off?
Is the voltage less than 1 V?
AB(diag)-52
Check Yes
Replace the airbag
harness.
Replace the
driver's airbag
module. <Ref. to
AB-15, Driver's Air-
bag Module.>
Replace the roll
connector. <Ref. to
AB-26, Roll Con-
nector.>
Go to step 5.
No
Go to step 2.
Go to step 3.
Go to step 4.
Replace the airbag
main harness
along with body
harness.