Subaru Legacy IV (2008 year). Service manual — part 1019
AB(diag)-64
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
Q: DTC 41 SIDE AIRBAG RH FAILURE
DTC DETECTING CONDITION:
• Side airbag harness (RH) is faulty.
• Side airbag module (RH) 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, side airbag
module RH and the side airbag sensor RH.
Is there poor contact?
Replace the airbag
rear harness along
with body harness.
Go to step 2.
AB18
AB24
AB25
1
2
17
18
AB28
8
7
3
4
1
2
AB18
AB28
AB-02105
3
4
AB34
AB34
18 19 20 21 22 23 24
1 2 3 4
11
10
12 13 14
16
17
15
1 2 3 4
1 2
AB24
AIRBAG CONTROL MODULE
CURTAIN AIRBAG
SENSOR RH
(C PILLAR)
SIDE AIRBAG
SENSOR RH
(B PILLAR)
SIDE AIRBAG
MODULE RH
8
7
6
5
9
AB(diag)-65
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
2
CHECK SIDE 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 connectors (AB25) and
(AB24), and connect the connector (1F) in test
harness F to connector (AB24).
3) Connect the airbag resistor to the connector
(3F) of test harness F.
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 side
airbag module
(RH). <Ref. to AB-
16, REMOVAL,
Side Airbag Mod-
ule.>
Go to step 3.
3
CHECK AIRBAG REAR HARNESS (SIDE
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 the connector (AB33) from cur-
tain airbag module (RH).
4) Disconnect the airbag resistor from test har-
ness F.
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
(5AG) in the test harness AG and connector
(3F) in the test harness F.
Connector & terminal
(5AG) No. 5 — (3F) No. 4:
(5AG) No. 7 — (3F) No. 3:
Is the resistance less than 10
:? Go to step 4.
Replace the airbag
rear harness along
with body harness.
4
CHECK AIRBAG REAR HARNESS (SIDE
AIRBAG MODULE HARNESS RH).
Measure the resistance between connector
(5AG) terminals in the test harness AG.
Connector & terminal
(5AG) No. 5 — (5AG) No. 7:
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 (SIDE
AIRBAG MODULE HARNESS RH).
Measure the resistance between connector
(5AG) in the test harness AG and chassis
ground.
Connector & terminal
(5AG) No. 5 — Chassis ground:
(5AG) No. 7 — 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)-66
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
R: DTC 42 SIDE AIRBAG LH FAILURE
DTC DETECTING CONDITION:
• Side airbag harness (LH) is faulty.
• Side 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, side airbag
module LH and the side airbag sensor LH.
Is there poor contact?
Replace the airbag
rear harness along
with body harness.
Go to step 2.
AB17
AB19
AB20
1
2
2
1
AB23
24
23
AB17
AB23
AB-02106
AB32
AB32
18 19 20 21 22 23 24
1 2 3 4
11 12 13 14
16
17
15
1 2 3 4
3
4
1
2
3
4
1 2
AB19
AIRBAG CONTROL MODULE
CURTAIN AIRBAG
SENSOR LH
(C PILLAR)
SIDE AIRBAG
SENSOR LH
(B PILLAR)
SIDE AIRBAG
MODULE LH
8
7
6
5
9 10
AB(diag)-67
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
2
CHECK SIDE 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 connectors (AB20) and
(AB19), and connect the connector (1F) in test
harness F to connector (AB19).
3) Connect the airbag resistor to the connector
(3F) of test harness F.
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 side
airbag module
(LH). <Ref. to AB-
16, REMOVAL,
Side Airbag Mod-
ule.>
Go to step 3.
3
CHECK AIRBAG REAR HARNESS (SIDE
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 the connector (AB31) from cur-
tain airbag module (LH).
4) Disconnect the airbag resistor from test har-
ness.
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
(5AG) in the test harness AG and connector
(3F) in the test harness F.
Connector & terminal
(5AG) No. 1 — (3F) No. 3:
(5AG) No. 3 — (3F) No. 4:
Is the resistance less than 10
:? Go to step 4.
Replace the airbag
rear harness along
with body harness.
4
CHECK AIRBAG REAR HARNESS (SIDE
AIRBAG MODULE HARNESS LH).
Measure the resistance between connector
(5AG) terminals in the test harness AG.
Connector & terminal
(5AG) No. 1 — (5AG) 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 (SIDE
AIRBAG MODULE HARNESS LH).
Measure the resistance between connector
(5AG) in the test harness AG and chassis
ground.
Connector & terminal
(5AG) No. 1 — Chassis ground:
(5AG) 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
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