Subaru Legacy IV (2008 year). Manual - part 1033

AB(diag)-120

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

BF:DTC FA SATELLITE SENSOR BUS COMMUNICATION ERROR

DTC DETECTING CONDITION:
• Open or short circuit in harness of satellite safing sensor.
• Satellite safing sensor 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 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 and seat belt
pretensioners of the driver’s and passenger’s seats for safety reasons.
• 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

CHECK POOR CONTACT IN CONNECTORS.
Check for poor contact of the connectors
(AB17, AB41) between the airbag control mod-
ule and the satellite safing sensor.

Is there poor contact?

Replace the airbag
rear harness along
with body harness.

Go to step 2.

AB-02114

AB17

AB41

AB42

AB41

AB17

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

17 18 19 20 21 22 23 24

1 2

AIRBAG CONTROL MODULE

SHIELD
JOINT
CONNECTOR

SEDAN MODEL

WAGON MODEL

TERMINAL No. OPTIONAL
ARRANGEMENT

SATELLITE

SAFETY

SENSOR

SATELLITE

SAFETY

SENSOR

AB(diag)-121

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

CHECK AIRBAG REAR HARNESS (BE-
TWEEN AIRBAG CONTROL MODULE AND
SATELLITE SAFING SENSOR).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Disconnect the connectors (AB21, AB26)
from seat belt pretensioner.
3) Disconnect the connectors (AB31, AB33)
from curtain airbag module.
4) Disconnect the connectors (AB19), (AB20),
(AB24) and (AB25) from the side airbag mod-
ule.
5) Disconnect the connectors (AB17, AB6,
AB18) from airbag control module.
6) Connect the connector (1AG) in the test har-
ness AG to the connectors (AB17, AB6, AB18).
7) Disconnect the connector (AB41) from sat-
ellite safing sensor, and then connect the con-
nector (1H) in the test harness H to connector
(AB41).
8) Measure the resistance between connector
(5AG) in the test harness AG and connector
(3H) in the test harness H.

Connector & terminal

(5AG) No. 9 — (3H) No. 5:
(5AG) No. 11 — (3H) No. 6:

Is the resistance less than 10

:? Go to step 3.

Replace the airbag
rear harness along
with body harness.

CHECK AIRBAG REAR HARNESS (BE-
TWEEN AIRBAG CONTROL MODULE AND
SATELLITE SAFING SENSOR).
Measure the resistance between connector
(5AG) in the test harness AG and chassis
ground, and the resistance between connector
(5AG) in the test harness AG and connector
(3H) in test harness H.

Connector & terminal

(5AG) No. 9 — Chassis ground:
(5AG) No. 11 — Chassis ground:
(5AG) No. 9 — (5AG) No. 11:

Is the resistance 1 M

: or

more?

Go to step 4.

Replace the airbag
rear harness along
with body harness.

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 satel-
lite safing sensor.
<Ref. to AB-24,
REMOVAL, Satel-
lite Safing Sen-
sor.> Replace the
airbag control
module if not oper-
ating normally
even after replac-
ing the sensor.
<Ref. to AB-20,
REMOVAL, Airbag
Control Module.>

Go to step 5.

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

AB(diag)-122

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

BG:DTC 3A FRONT SUB SENSOR RH FALSE INSTALLATION

DTC DETECTING CONDITION:
Front sub sensor (RH) is misinstalled.

BH:DTC 3B FRONT SUB SENSOR LH FALSE INSTALLATION

DTC DETECTING CONDITION:
Front sub sensor (LH) is misinstalled.

BI: DTC 3C SATELLITE SENSOR BUS FAILURE

DTC DETECTING CONDITION:
Satellite safing sensor is faulty.

BJ:DTC 3D SATELLITE SENSOR FALSE INSTALLATION

DTC DETECTING CONDITION:
Satellite safing sensor is misinstalled.

Step

Check

Yes

REPLACE THE FRONT SUB SENSOR.
1) Turn the ignition switch to OFF, disconnect
the ground cable from battery, and wait for 20
seconds or more.
2) Replace the front sub sensor (RH) with a
genuine sensor. <Ref. to AB-21, REMOVAL,
Front Sub Sensor.>

Does the warning light go off?

Finish the diagno-
sis.

Replace the airbag
control module.
<Ref. to AB-20,
REMOVAL, Airbag
Control Module.>

Step

Check

Yes

REPLACE THE FRONT SUB SENSOR.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Replace the front sub sensor (LH) with a
genuine sensor. <Ref. to AB-21, REMOVAL,
Front Sub Sensor.>

Does the warning light go off?

Finish the diagno-
sis.

Replace the airbag
control module.
<Ref. to AB-20,
REMOVAL, Airbag
Control Module.>

Step

Check

Yes

REPLACE SATELLITE SAFING SENSOR.
1) Turn the ignition switch to OFF, disconnect
the ground cable from battery, and wait for 20
seconds or more.
2) Replace the satellite safing sensor with a
genuine sensor. <Ref. to AB-24, REMOVAL,
Satellite Safing Sensor.>

Does the warning light go off?

Finish the diagno-
sis.

Replace the airbag
control module.
<Ref. to AB-20,
REMOVAL, Airbag
Control Module.>

Step

Check

Yes

Does the warning light go off?

Finish the diagno-
sis.

Replace the airbag
control module.
<Ref. to AB-20,
REMOVAL, Airbag
Control Module.>

AB(diag)-123

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

BK:DTC 5A SIDE AIRBAG SENSOR RH FALSE INSTALLATION

DTC DETECTING CONDITION:
Side airbag sensor RH is misinstalled.

BL:DTC 5B SIDE AIRBAG SENSOR LH FALSE INSTALLATION

DTC DETECTING CONDITION:
Side airbag sensor LH is misinstalled.

BM:DTC 5C CURTAIN AIRBAG SENSOR RH FALSE INSTALLATION

DTC DETECTING CONDITION:
Curtain side airbag sensor RH is misinstalled.

BN:DTC 5D CURTAIN AIRBAG SENSOR LH FALSE INSTALLATION

DTC DETECTING CONDITION:
Curtain side airbag sensor LH is misinstalled.

Step

Check

Yes

REPLACE SIDE AIRBAG SENSOR (RH).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Replace the side airbag sensor (RH) with a
genuine sensor. <Ref. to AB-22, REMOVAL,
Side Airbag Sensor.>

Does the warning light go off?

Finish the diagno-
sis.

Replace the airbag
control module.
<Ref. to AB-20,
REMOVAL, Airbag
Control Module.>

Step

Check

Yes

REPLACE SIDE AIRBAG SENSOR (LH).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Replace the side airbag sensor (LH) with a
genuine sensor. <Ref. to AB-22, REMOVAL,
Side Airbag Sensor.>

Does the warning light go off?

Finish the diagno-
sis.

Replace the airbag
control module.
<Ref. to AB-20,
REMOVAL, Airbag
Control Module.>

Step

Check

Yes

REPLACE CURTAIN AIRBAG SENSOR (RH).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Replace the curtain airbag sensor (RH) with
a genuine sensor. <Ref. to AB-23, REMOVAL,
Curtain Airbag Sensor.>

Does the warning light go off?

Finish the diagno-
sis.

Replace the airbag
control module.
<Ref. to AB-20,
REMOVAL, Airbag
Control Module.>

Step

Check

Yes

REPLACE CURTAIN AIRBAG SENSOR (LH).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Replace the curtain airbag sensor (LH) with
a genuine sensor. <Ref. to AB-23, REMOVAL,
Curtain Airbag Sensor.>

Does the warning light go off?

Finish the diagno-
sis.

Replace the airbag
control module.
<Ref. to AB-20,
REMOVAL, Airbag
Control Module.>

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