Subaru Legacy IV (2008 year). Service manual — part 1014

AB(diag)-44

List of Diagnostic Trouble Code (DTC)

AIRBAG SYSTEM (DIAGNOSTICS)

F8
F9
FA

Satellite Sensor Bus Communica-
tion error

• Open or short circuit in harness between airbag
control module and satellite safing sensor.
• Satellite safing sensor is faulty.
• Airbag control module is faulty.

<Ref. to AB(diag)-119,
DTC F8 SATELLITE
SENSOR BUS COM-
MUNICATION ERROR,
Diagnostic Chart with
Trouble Code.> <Ref. to
AB(diag)-119, DTC F9
SATELLITE SENSOR
BUS COMMUNICA-
TION ERROR, Diagnos-
tic Chart with Trouble
Code.> <Ref. to
AB(diag)-120, DTC FA
SATELLITE SENSOR
BUS COMMUNICA-
TION ERROR, Diagnos-
tic Chart with Trouble
Code.>

3A

Front Sub Sensor RH false installa-
tion

• Front sensor (RH) is misinstalled.
• Airbag control module is faulty.

<Ref. to AB(diag)-122,
DTC 3A FRONT SUB
SENSOR RH FALSE
INSTALLATION, Diag-
nostic Chart with Trouble
Code.>

3B

Front Sub Sensor LH false installa-
tion

• Front sensor (LH) is misinstalled.
• Airbag control module is faulty.

<Ref. to AB(diag)-122,
DTC 3B FRONT SUB
SENSOR LH FALSE
INSTALLATION, Diag-
nostic Chart with Trouble
Code.>

3C

Satellite Sensor Bus failure

Satellite safing sensor is faulty.

<Ref. to AB(diag)-122,
DTC 3C SATELLITE
SENSOR BUS FAIL-
URE, Diagnostic Chart
with Trouble Code.>

3D

Satellite Sensor false installation

• Satellite safing sensor is misinstalled.
• Airbag control module is faulty.

<Ref. to AB(diag)-122,
DTC 3D SATELLITE
SENSOR FALSE
INSTALLATION, Diag-
nostic Chart with Trouble
Code.>

5A

Side Airbag Sensor RH false instal-
lation

• Side A/B sensor is misinstalled.
• Airbag control module is faulty.

<Ref. to AB(diag)-123,
DTC 5A SIDE AIRBAG
SENSOR RH FALSE
INSTALLATION, Diag-
nostic Chart with Trouble
Code.>

5B

Side Airbag Sensor LH false instal-
lation

• Side A/B sensor is misinstalled.
• Airbag control module is faulty.

<Ref. to AB(diag)-123,
DTC 5B SIDE AIRBAG
SENSOR LH FALSE
INSTALLATION, Diag-
nostic Chart with Trouble
Code.>

5C

Curtain Airbag Sensor RH false
installation

• Curtain A/B sensor is misinstalled.
• Airbag control module is faulty.

<Ref. to AB(diag)-123,
DTC 5C CURTAIN AIR-
BAG SENSOR RH
FALSE INSTALLATION,
Diagnostic Chart with
Trouble Code.>

DTC

Display

Content of diagnosis

Reference

AB(diag)-45

List of Diagnostic Trouble Code (DTC)

AIRBAG SYSTEM (DIAGNOSTICS)

5D

Curtain Airbag Sensor LH false
installation

• Curtain A/B sensor is misinstalled.
• Airbag control module is faulty.

<Ref. to AB(diag)-123,
DTC 5D CURTAIN AIR-
BAG SENSOR LH
FALSE INSTALLATION,
Diagnostic Chart with
Trouble Code.>

DTC

Display

Content of diagnosis

Reference

AB(diag)-46

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

14.Diagnostic Chart with Trouble Code

A: DTC 11 DRIVER’S AIRBAG FAILURE

DTC DETECTING CONDITION:
• Airbag main harness circuit is open, shorted or shorted to ground.
• Airbag module harness (Driver’s side) circuit is open, shorted or shorted to ground.
• Roll connector circuit is open, shorted or shorted to ground.
• Driver’s airbag module 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.

NOTE:
Prior to starting work, prepare two airbag resistors (98299PA040).
WIRING DIAGRAM:

AIRBAG CONTROL MODULE

7

8

5

6

AB6

AB2

AB2

AB7

AB6

AB38

2

1

2

1

2

1

AB38

AB37

1 2 3 4

2

1

AB37

18 19 20

21 22 23 24 25 26 27 28

1 2 3

5 6 7 8

10

9

4

11 12 13 14

16 17

15

29 30

AB-01761

4

3

2

1

STEERING
ROLL CONNECTOR

DRIVER'S

AIRBAG MODULE

AB(diag)-47

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK POOR CONTACT IN CONNECTORS.
Check for poor contact of the connectors
between the airbag control module and the
driver’s airbag module.

Is there poor contact?

Replace the airbag
harness.

Go to step 2.

2

CHECK DRIVER’S AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Remove the driver’s airbag module.
3) Connect the connector (1N) in the test har-
ness N to the connector (AB38).
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.

Does the airbag warning light
illuminate for 6 seconds and go
off?

Replace the
driver’s airbag
module. <Ref. to
AB-14, Driver’s Air-
bag Module.>

Go to step 3.

3

CHECK ROLL CONNECTOR.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds 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.

Does the airbag warning light
illuminate for 6 seconds and go
off?

Replace the roll
connector. <Ref. to
AB-25, Roll Con-
nector.>

Go to step 4.

4

CHECK AIRBAG MAIN HARNESS (DRIV-
ER’S AIRBAG HARNESS).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Disconnect the airbag resistor from the con-
nectors (2P) and (3P) of test harness P.
3) Remove the instrument panel side cover on
the passenger’s side and disconnect the con-
nectors (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) Measure the resistance between connector
(3AG) in the test harness AG and connectors
(2P) and (3P) in the test harness P.

Connector & terminal

(3AG) No. 1 — (2P) No. 1:
(3AG) No. 3 — (2P) No. 2:
(3AG) No. 2 — (3P) No. 3:
(3AG) No. 4 — (3P) No. 4:

Is the resistance less than 10

:? Go to step 5.

Replace the airbag
main harness
along with body
harness.