Subaru Legacy (2005 year). Service manual — part 911

AB(diag)-81

AIRBAG SYSTEM (DIAGNOSTICS)

Diagnostic Chart with Trouble Code

Step

Check

Yes

No

1

CHECK AIRBAG REAR HARNESS (CUR-
TAIN AIRBAG SENSOR HARNESS RH).
1) Turn the ignition switch OFF, disconnect the
battery ground cable, and wait more than 20
seconds.
2) Disconnect the connector (AB26) from seat
belt pretensioner (RH).
3) For the model with lap seat belt preten-
sioner, disconnect the connector (AB30) from
lap seat belt pretensioner.
4) Disconnect the connector (AB24) from side
airbag module (RH).
5) Disconnect the connector (AB33) from
(AB40).
6) Disconnect the connector (AB18) from air-
bag control module.
7) Connect the connector (1U) in the test har-
ness U to connector (AB18).
8) Disconnect the connector (AB34) from cur-
tain airbag sensor (RH), and connect the con-
nector (2V) in test harness V to connector
(AB34).
9) Measure the resistance between connector
(5U) in the test harness U and connector (3V)
in the test harness V.

Connector & terminal

(5U) No. 14 — (3V) No. 4:
(5U) No. 16 — (3V) No. 5:
(5U) No. 15 — (3V) No. 1:
(5U) No. 13 — (3V) No. 2:

Is the resistance less than 10
Ω?

Go to step 2.

Replace the airbag
rear harness with
body harness.

2

CHECK AIRBAG REAR HARNESS (CUR-
TAIN AIRBAG SENSOR HARNESS RH).
Measure the resistance between connector
(5U) in the test harness U and chassis ground.

Connector & terminal

(5U) No. 14 — Chassis ground:
(5U) No. 16 — Chassis ground:
(5U) No. 15 — Chassis ground:
(5U) No. 13 — Chassis ground:

Is the resistance more than 1
M

Ω?

Replace the cur-
tain airbag sensor
(RH). <Ref. to AB-
24, Curtain Airbag
Sensor.> When
the sensor is not
OK though the
sensor is replaced,
replace the airbag
control module.
<Ref. to AB-22,
Airbag Control
Module.>

Replace the airbag
rear harness with
body harness.

AB(diag)-82

AIRBAG SYSTEM (DIAGNOSTICS)

Diagnostic Chart with Trouble Code

X: DTC 57 CURTAIN AIRBAG SENSOR LH FAILURE

DTC DETECTING CONDITION:
• Curtain airbag sensor (LH) is faulty.
• Curtain airbag harness (LH) circuit is faulty.
• Airbag control module is faulty.

CAUTION:
• Before diagnosing the airbag system, be sure to turn the ignition switch OFF, disconnect the
ground cable from battery, and wait more than 20 seconds 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 connector 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:

AB-01259

AB32

1

2

11

12

AB31

AB39

15

1

14

13

3

4

1

2

AB31

1 2

AB17

AB17 AIRBAG CONTROL MODULE

CURTAIN AIRBAG

MODULE LH

CURTAIN AIRBAG

SENSOR LH

7 8 9 10 11 12

13 14 15 16 17 18 19

5 6

20

1 2

3 4

AB32

1 2 3 4

AB(diag)-83

AIRBAG SYSTEM (DIAGNOSTICS)

Diagnostic Chart with Trouble Code

Y: DTC 58 CURTAIN AIRBAG SENSOR RH FAILURE

DTC DETECTING CONDITION:
Curtain airbag sensor (RH) is faulty.
If DTC 58 is displayed, the circuit within the curtain airbag sensor (RH) is faulty. Replace the curtain airbag
sensor (RH). <Ref. to AB-24, Curtain Airbag Sensor.>

Z: DTC 59 CURTAIN AIRBAG SENSOR LH FAILURE

DTC DETECTING CONDITION:
Curtain airbag sensor (LH) is faulty.
If DTC 59 is displayed, the circuit within the curtain airbag sensor (LH) is faulty. Replace the curtain airbag
sensor (LH). <Ref. to AB-24, Curtain Airbag Sensor.>

Step

Check

Yes

No

1

CHECK AIRBAG REAR HARNESS (CUR-
TAIN AIRBAG SENSOR HARNESS LH).
1) Turn the ignition switch OFF, disconnect the
battery ground cable, and wait more than 20
seconds.
2) Disconnect the connector (AB21) from seat
belt pretensioner (LH).
3) Disconnect the connector (AB19) from side
airbag module (LH).
4) Disconnect the connector (AB31) from
(AB39).
5) Disconnect the connector (AB17) from air-
bag control module.
6) Connect the connector (1U) in the test har-
ness U to connector (AB17).
7) Disconnect the connector (AB32) from cur-
tain airbag sensor (LH), and connect the con-
nector (2V) in test harness V to connector
(AB32).
8) Measure the resistance between connector
(5U) in the test harness U and connector (3V)
in the test harness V.

Connector & terminal

(5U) No. 11 — (3V) No. 4:
(5U) No. 9 — (3V) No. 5:
(5U) No. 10 — (3V) No. 1:
(5U) No. 12 — (3V) No. 2:

Is the resistance less than 10
Ω?

Go to step 2.

Replace the airbag
rear harness with
body harness.

2

CHECK AIRBAG REAR HARNESS (CUR-
TAIN AIRBAG SENSOR HARNESS LH).
Measure the resistance between connector
(5U) in the test harness U and chassis ground.

Connector & terminal

(5U) No. 11 — Chassis ground:
(5U) No. 9 — Chassis ground:
(5U) No. 10 — Chassis ground:
(5U) No. 12 — Chassis ground:

Is the resistance more than 1
M

Ω?

Replace the cur-
tain airbag sensor
(LH). <Ref. to AB-
24, Curtain Airbag
Sensor.> When
the sensor is not
OK though the
sensor is replaced,
replace the airbag
control module.
<Ref. to AB-22,
Airbag Control
Module.>

Replace the airbag
rear harness with
body harness.

AB(diag)-84

AIRBAG SYSTEM (DIAGNOSTICS)

Diagnostic Chart with Trouble Code

AA:DTC 61 BELT PRETENSIONER RH FAILURE

DTC DETECTING CONDITION:
• Seat belt pretensioner (RH) circuit is open, shorted or shorted to ground.
• Airbag control module is faulty.
• Pretensioner is faulty.
• Pretensioner harness is faulty.

CAUTION:
• Before diagnosing the airbag system, be sure to turn the ignition switch OFF, disconnect the
ground cable from battery, and wait more than 20 seconds 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 rear harness, disconnect the side airbag module connector, curtain
airbag module connector, seat belt pretensioner connector and lap seat belt pretensioner connector
for safety reasons.
WIRING DIAGRAM:

AB-01203

1

2

AB18

AB26

AB26

1 2

AIRBAG CONTROL MODULE

PRETENSIONER RH

WITH CURTAIN AIRBAG
OR LAP SEAT BELT
PRETENSIONER

1

2

*

1

: 11

*

2

: 12

WITHOUT CURTAIN AIRBAG

*

1

: 5

*

2

: 6

*

*

AB18

AB18

7 8 9 10 11 12

13 14 15 16 17 18 19

5 6

20

1 2

3 4

1 2 3 4 5 6

7 8 9 10 11 12

(WITHOUT CURTAIN AIRBAG)

(WITH CURTAIN AIRBAG

OR LAP SEAT BELT

PRETENSIONER)