Subaru Legacy IV (2008 year). Service manual — part 1026
AB(diag)-92
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
2
CHECK CURTAIN AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Disconnect the connector (AB33), and con-
nect the connector (1N) in test harness N to
connector (AB33).
3) Connect the airbag resistor to the connector
(2N) of test harness N.
4) Connect the battery ground terminal and
turn the ignition switch to ON.
Does the airbag warning light
illuminate for 6 seconds and go
off?
Replace the cur-
tain airbag module
(RH). <Ref. to AB-
18, Curtain Airbag
Module.>
Go to step 3.
3
CHECK AIRBAG REAR HARNESS (CUR-
TAIN AIRBAG MODULE HARNESS RH).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Disconnect the connector (AB26) from seat
belt pretensioner (RH).
3) Disconnect connector (AB24) from side air-
bag module (RH).
4) Disconnect the airbag resistor from test har-
ness N.
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
(6AG) in the test harness AG and connector
(2N) in the test harness N.
Connector & terminal
(6AG) No. 6 — (2N) No. 1:
(6AG) No. 8 — (2N) No. 2:
Is the resistance less than 10
:? Go to step 4.
Replace the airbag
rear harness along
with body harness.
4
CHECK AIRBAG REAR HARNESS (CUR-
TAIN AIRBAG MODULE HARNESS RH).
Measure the resistance between connector
(6AG) terminals in the test harness AG.
Connector & terminal
(6AG) No. 6 — (6AG) No. 8:
Is the resistance 1 M
: or
more?
Go to step 5.
Replace the airbag
rear harness along
with body harness.
5
CHECK AIRBAG REAR HARNESS (CUR-
TAIN AIRBAG MODULE HARNESS RH).
Measure the resistance between connector
(6AG) in the test harness AG and chassis
ground.
Connector & terminal
(6AG) No. 6 — Chassis ground:
(6AG) No. 8 — Chassis ground:
Is the resistance 1 M
: or
more?
Go to step 6.
Replace the airbag
rear harness along
with body harness.
6
CHECK AIRBAG CONTROL MODULE.
1) Connect all connectors.
2) Clear the memory.
3) Perform the Inspection Mode.
4) Read the DTC.
Is the same DTC displayed?
Replace the airbag
control module.
<Ref. to AB-20,
Airbag Control
Module.>
Go to step 7.
7
CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
Check DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
AB(diag)-38, List
of Diagnostic Trou-
ble Code (DTC).>
Finish the diagno-
sis.
Step
Check
Yes
No
AB(diag)-93
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
AI: DTC 92 CURTAIN AIRBAG MODULE LH FAILURE
DTC DETECTING CONDITION:
• Curtain airbag harness (LH) is faulty.
• Curtain airbag module (LH) is faulty.
• Airbag control module is faulty.
CAUTION:
• Before diagnosing the airbag system, be sure to turn the ignition switch to OFF, disconnect the
ground cable from the battery, and wait 20 seconds or more before starting to work.
• When replacing the airbag module, seat belt pretensioner, roll connector, control module and sen-
sor, reconnect each part and check that the warning light operates properly.
• When inspecting the airbag main harness, disconnect the airbag module connectors of the driver’s
and passenger’s seats for safety.
• When inspecting the airbag rear harness, disconnect the side airbag module connector, curtain
airbag module connector and seat belt pretensioner connector for safety reasons.
WIRING DIAGRAM:
Step
Check
Yes
No
1
CHECK POOR CONTACT IN CONNECTORS.
Check for poor contact of the connectors
between the airbag control module, curtain air-
bag module LH and the curtain airbag sensor
LH.
Is there poor contact?
Replace the airbag
rear harness along
with body harness.
Go to step 2.
AB17
AB31
1 2
AB32
AB17
AB31
1
2
3
4
AB23
23
24
3
4
1
2
AB-02111
3
4
AB32
AB23
18 19 20 21 22 23 24
1 2 3 4
11 12 13 14
16
17
15
1 2 3 4
AIRBAG CONTROL MODULE
CURTAIN AIRBAG
MODULE LH
CURTAIN AIRBAG
SENSOR LH
(C PILLAR)
SIDE AIRBAG
SENSOR LH
(B PILLAR)
10
8
7
6
5
9
AB(diag)-94
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
2
CHECK CURTAIN AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Disconnect the connector (AB31), and con-
nect the connector (1N) in test harness N to
connector (AB31).
3) Connect the airbag resistor to the connector
(2N) of test harness N.
4) Connect the battery ground terminal and
turn the ignition switch to ON.
Does the airbag warning light
illuminate for 6 seconds and go
off?
Replace the cur-
tain airbag module
(LH). <Ref. to AB-
18, Curtain Airbag
Module.>
Go to step 3.
3
CHECK AIRBAG REAR HARNESS (CUR-
TAIN AIRBAG MODULE HARNESS LH).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Disconnect the connector (AB21) from seat
belt pretensioner (LH).
3) Disconnect connector (AB19) from side air-
bag module (LH).
4) Disconnect the airbag resistor from test har-
ness N.
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
(6AG) in the test harness AG and connector
(2N) in the test harness N.
Connector & terminal
(6AG) No. 1 — (2N) No. 2:
(6AG) No. 3 — (2N) No. 1:
Is the resistance less than 10
:? Go to step 4.
Replace the airbag
rear harness along
with body harness.
4
CHECK AIRBAG REAR HARNESS (CUR-
TAIN AIRBAG MODULE HARNESS LH).
Measure the resistance between connector
(6AG) terminals in the test harness AG.
Connector & terminal
(6AG) No. 1 — (6AG) No. 3:
Is the resistance 1 M
: or
more?
Go to step 5.
Replace the airbag
rear harness along
with body harness.
5
CHECK AIRBAG REAR HARNESS (CUR-
TAIN AIRBAG MODULE HARNESS LH).
Measure the resistance between connector
(6AG) in the test harness AG and chassis
ground.
Connector & terminal
(6AG) No. 1 — Chassis ground:
(6AG) No. 3 — Chassis ground:
Is the resistance 1 M
: or
more?
Go to step 6.
Replace the airbag
rear harness along
with body harness.
6
CHECK AIRBAG CONTROL MODULE.
1) Connect all connectors.
2) Clear the memory.
3) Perform the Inspection Mode.
4) Read the DTC.
Is the same DTC displayed?
Replace the airbag
control module.
<Ref. to AB-20,
Airbag Control
Module.>
Go to step 7.
7
CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
Check DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
AB(diag)-38, List
of Diagnostic Trou-
ble Code (DTC).>
Finish the diagno-
sis.
Step
Check
Yes
No
AB(diag)-95
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
AJ:DTC 95 CURTAIN AIRBAG MODULE RH FAILURE
DTC DETECTING CONDITION:
• Curtain airbag harness (RH) is shorted to power supply.
• Airbag control module is faulty.
CAUTION:
• Before diagnosing the airbag system, be sure to turn the ignition switch to OFF, disconnect the
ground cable from the battery, and wait 20 seconds or more before starting to work.
• When replacing the airbag module, seat belt pretensioner, roll connector, control module and sen-
sor, reconnect each part and check that the warning light operates properly.
• When inspecting the airbag main harness, disconnect the airbag module connectors of the driver’s
and passenger’s seats for safety.
• When inspecting the airbag rear harness, disconnect the side airbag module connector, curtain
airbag module connector and seat belt pretensioner connector for safety reasons.
WIRING DIAGRAM:
AB33
1 2
AB34
AB18
AB33
1
2
6
5
AB28
17
18
3
4
1
2
AB-02110
3
4
AB34
AB28
1 2 3 4
AB18
18 19 20 21 22 23 24
1 2 3 4
11 12 13 14
16
17
15
AIRBAG CONTROL MODULE
CURTAIN AIRBAG
SENSOR RH
(C PILLAR)
CURTAIN AIRBAG
MODULE RH
SIDE AIRBAG
SENSOR RH
(B PILLAR)
10
8
7
6
5
9
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