AB(diag)-28
Subaru Select Monitor
AIRBAG SYSTEM (DIAGNOSTICS)
9
CHECK OUTPUT SIGNAL TO THE AIRBAG
CONTROL MODULE.
1) Turn the ignition switch to ON in the condi-
tion of step 8.
2) Measure the voltage between data link con-
nector and chassis ground.
Connector & terminal
(B40) No. 7 (+) — Chassis ground (–):
Is the voltage less than 1 V?
Go to step
10
.
Repair the harness
and connector
between each con-
trol module and
data link connec-
tor. (Replace the
entire harness if
repair is necessary
for airbag har-
ness.)
10
CHECK THE HARNESS BETWEEN THE AIR-
BAG CONTROL MODULE AND DATA LINK
CONNECTOR.
1) Turn the ignition switch to OFF, disconnect
the ground cable from battery, and wait for 20
seconds or more.
2) Disconnect the connectors (AB6, AB17,
AB18) from airbag control module.
3) Connect the test harness AG connector
(1AG) to the connectors (AB6, AB17, AB18).
4) Measure the resistance between connector
(4AG) in the test harness AG and the data link
connector.
Connector & terminal
(4AG) No. 1 — (B40) No. 7:
Is the resistance less than 10
:
? Go to step
11
.
Repair the harness
between the airbag
control module and
the data link con-
nector. Or replace
the airbag main
harness along with
the bulkhead har-
ness.
11
CHECK POWER SUPPLY CIRCUIT.
1) Turn the ignition switch to ON.
2) Measure the voltage between connector
(2AG) in the test harness AG and chassis
ground.
Connector & terminal
(2AG) No. 1 — Chassis ground:
Is the voltage 10 V or more?
Go to step
12
.
Repair the harness
between the airbag
control module and
the battery. Or
replace the airbag
main harness
along with the bulk-
head harness.
12
CHECK BETWEEN THE AIRBAG CONTROL
MODULE AND CHASSIS GROUND.
1) Turn the ignition switch to OFF.
2) Measure the resistance between connector
(2AG) in the test harness AG and chassis
ground.
Connector & terminal
(2AG) No. 4 — Chassis ground:
(2AG) No. 3 — Chassis ground:
Is the resistance less than 10
:
? Go to step
13
.
Repair the harness
between the airbag
control module and
the chassis
ground. Or replace
the airbag main
harness along with
the bulkhead har-
ness.
13
CHECK POOR CONTACT OF CONNECTOR.
Is there poor contact of the con-
trol module power supply,
ground circuit and data link con-
nector?
Repair the connec-
tor. (For airbag
system connec-
tors, do not repair
but replace the
entire harness.)
Replace the airbag
control module.
<Ref. to AB-21,
REMOVAL, Airbag
Control Module.>
Step
Check
Yes
No
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