Subaru Legacy III (2000-2003 year). Manual — part 912

AB-74

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

W: DTC 65

DIAGNOSIS:
• Seat belt pretensioner (RH) circuit is shorted to the power supply.
• Pretensioner is faulty.
• Pretensioner harness 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 the battery, and wait more than 20 seconds before starting to work.
• Before replacing the airbag module, roll connector, control module, and sensor, reconnect each
part and confirm that the warning light operates properly.
• When inspecting the side airbag harness, disconnect the side airbag module connector and seat
belt pretensioner connector for the safety reasons.
WIRING DIAGRAM:

6

5

PRETENSIONER RH

1

2

AIRBAG CONTROL MODULE

AB18

AB26

AB26

AB18

1 2

1 2 3 4 5 6

7 8 9 10 11 12

AB-00301

AB-75

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK SEAT BELT PRETENSIONER.
1) Turn the ignition switch OFF, disconnect

the battery ground cable, and wait more
than 20 seconds.

2) Disconnect the connector (AB26) from the

seat belt pretensioner (RH). <Ref. to SB-7,
Front Seat Belt.>

3) Connect the connector (1F) in test harness

F to (AB26).

4) Connect the airbag resistor to connector

(3F) in test harness F.

5) Connect the battery ground cable, and turn

the ignition switch ON.
Does the airbag warning light operate prop-
erly?

Operates properly.

Replace seat belt
pretensioner (RH).
<Ref. to SB-7,
Front Seat Belt.>

Go to step 2.

2

CHECK SIDE AIRBAG HARNESS (RH).
1) Turn the ignition switch OFF, disconnect

the battery ground cable, and wait more
than 20 seconds.

2) Disconnect the airbag resistor from the test

harness.

3) Disconnect the connector (AB25) from

(AB24).

4) Disconnect the connectors (AB17) and

(AB18) from the airbag control module.
<Ref. to AB-17, Airbag Control Module.>

5) Connect the connector (1I) in test harness

I2 to the connector (AB18).

6) Connect the battery ground cable and turn

the ignition switch ON.

7) Measure the voltage between connector

(3I) in test harness I2 and the chassis
ground.

Connector & terminal

(3I) No. 6 (+) — Chassis ground (

−−−−

):

(3I) No. 8 (+) — Chassis ground (

−−−−

):

Is the measured value less than the speci-
fied value?

1 V

Replace the airbag
control module.
<Ref. to AB-17,
Airbag Control
Module.>

Replace side air-
bag harness.
<Ref. to AB-16,
Side Airbag Har-
ness.>

AB-76

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

X: DTC 66

DIAGNOSIS:
• Seat belt pretensioner (LH) circuit is shorted to the power supply.
• Pretensioner is faulty.
• Pretensioner harness 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 the battery, and wait more than 20 seconds before starting to work.
• Before replacing the airbag module, roll connector, control module and the sensor, reconnect each
part and confirm that the warning light operates properly.
• When inspecting the side airbag harness, disconnect the side airbag module connector and seat
belt pretensioner connector for the safety reasons.
WIRING DIAGRAM:

AB-00302

1

2

PRETENSIONER LH

1

2

AIRBAG CONTROL MODULE

AB17

AB21

AB21

AB17

1 2

1 2 3 4 5 6

7 8 9 10 11 12

AB-77

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK SEAT BELT PRETENSIONER.
1) Turn the ignition switch OFF, disconnect

the battery ground cable, and wait more
than 20 seconds.

2) Disconnect the connector (AB21) from the

seat belt pretensioner (LH). <Ref. to SB-7,
Front Seat Belt.>

3) Connect the connector (1F) in test harness

F to (AB21).

4) Connect the airbag resistor to the connec-

tor (3F) in test harness F.

5) Connect the battery ground cable and turn

the ignition switch ON.
Does the airbag warning light operate prop-
erly?

Operates properly.

Replace seat belt
pre-tensioner (LH).
<Ref. to SB-7,
Front Seat Belt.>

Go to step 2.

2

CHECK SIDE AIRBAG HARNESS (LH).
1) Turn the ignition switch OFF, disconnect

the battery ground cable, and wait more
than 20 seconds.

2) Disconnect the airbag resistor from the test

harness.

3) Disconnect the connector (AB20) from

(AB19).

4) Disconnect the connectors (AB17) and

(AB18) from the airbag control module.
<Ref. to AB-17, Airbag Control Module.>

5) Connect the connector (1I) in test harness

I2 to the connector (AB17).

6) Connect the battery ground cable and turn

the ignition switch ON.

7) Measure the voltage between connector

(3I) in test harness I2 and the chassis
ground.

Connector & terminal

(3I) No. 11 (+) — Chassis ground (

−−−−

):

(3I) No. 13 (+) — Chassis ground (

−−−−

):

Is the measured value less than the speci-
fied value?

1 V

Replace the airbag
control module.
<Ref. to AB-17,
Airbag Control
Module.>

Replace side air-
bag harness.
<Ref. to AB-16,
Side Airbag Har-
ness.>