Subaru Legacy III (2000-2003 year). Manual — part 906

AB-50

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

5

CHECK AIRBAG MAIN HARNESS
1) Remove the instrument panel. <Ref. to EI-

35, Instrument Panel Assembly.>

2) Disconnect connector (AB15) from (AB14),

and connect connector (2F) in test harness
F to connector (AB14).

3) Measure the resistance between connector

(3I) in test harness I2 and connector (3F) in
test harness F.

Connector & terminal

(3I) No. 2 — (3F) No. 6:
(3I) No. 4 — (3F) No. 5:

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

10

Ω

Go to step 6.

Replace airbag
main harness.
<Ref. to AB-15,
Main Harness.>

6

CHECK AIRBAG MAIN HARNESS
Measure the resistance between connector
(3I) in test harness I2 and the chassis ground.

Connector & terminal

(3I) No. 2 — Chassis ground:
(3I) No. 4 — Chassis ground:

Does the measured value exceed the specified
value?

1 M

Ω

Go to step 7.

Replace airbag
main harness.
<Ref. to AB-15,
Main Harness.>

7

CHECK FRONT SUB-SENSOR HARNESS
(RH).
1) Connect connector (1F) in test harness F to

the connector (AB15).

2) Measure the resistance between connector

(3H) in test harness H and connector (3F)
in the test harness F.

Connector & terminal

(3F) No. 3 — (3H) No. 5:
(3F) No. 4 — (3H) No. 6:

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

10

Ω

Go to step 8.

Replace the front
sub-sensor har-
ness (RH) <Ref. to
AB-21, Front Sub
Sensor Harness.>

8

CHECK FRONT SUB-SENSOR HARNESS
(RH).
Measure the resistance between connector
(3F) in test harness F and the chassis ground.

Connector & terminal

(3F) No. 3 — Chassis ground:
(3F) No. 4 — Chassis ground:

Does the measured value exceed the specified
value?

1 M

Ω

Go to step 9.

Replace the front
sub-sensor har-
ness (RH) <Ref. to
AB-21, Front Sub
Sensor Harness.>

9

CHECK FRONT SUB-SENSOR (RH).
1) Connect connector (2H) in test harness H

to front sub-sensor (RH).

2) Measure the resistance of the connector

(3H) in test harness H.

Connector & terminal

(3H) No. 3 — No. 4:

Is the measured value within the specified
range?

750

Ω

— 1 K

Ω

Go to step 10.

Replace the front
sub-sensor (RH)
<Ref. to AB-20,
Front Sub Sen-
sor.>

Step

Value

Yes

No

AB-51

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

10

CHECK FRONT SUB-SENSOR (RH).
Measure the resistance between connector
(3H) in test harness H and the chassis ground.

Connector & terminal

(3H) No. 3 — Chassis ground:
(3H) No. 4 — Chassis ground:

Does the measured value exceed the specified
value?

1 M

Ω

Finish the diagno-
sis.

Replace the front
sub-sensor (RH)
<Ref. to AB-20,
Front Sub Sen-
sor.>

Step

Value

Yes

No

AB-52

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

K: DTC 32

DIAGNOSIS:
• Front sub-sensor harness (LH) circuit is shorted.
• Front sub-sensor harness (LH) circuit is open.
• Front sub-sensor (LH) 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 airbag main harness, disconnect the driver's airbag module and passenger's
airbag module connectors for safety reasons.
WIRING DIAGRAM:

AB-00298

26

15

FRONT SUB SENSOR LH

2

1

1

2

AIRBAG CONTROL MODULE

AB6

AB11

AB12

AB13

AB12

AB13

1 2

AB6

1 2 3

4 5 6

7 8 9 10 11 12 13 14 15 16 17

18 19 20 21 22 23 24 25 26 27 28

2

1

AB-53

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK FRONT SUB-SENSOR (LH) AND
FRONT SUB-SENSOR HARNESS (RH).
1) Turn the ignition switch OFF, disconnect

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

2) Disconnect connector (AB6) from the air-

bag control module, and connect connector
(1I) in the test harness I2 to connector
(AB6). <Ref. to AB-17, Airbag Control
Module.>

3) Measure the resistance of the connector

(3I) in the test harness I2.

Connector & terminal

(3I) No. 1 — No. 3:

Is the measured value within the specified
range?

750

Ω

— 1 K

Ω

Go to step 2.

Go to step 3.

2

CHECK FRONT SUB-SENSOR (LH) AND
FRONT SUB-SENSOR HARNESS (RH).
Measure the resistance between connector
(3I) in test harness I2 and the chassis ground.

Connector & terminal

(3I) No. 1 — Chassis ground:
(3I) No. 3 — Chassis ground:

Does the measured value exceed the specified
value?

1 M

Ω

Replace the air-
bag control mod-
ule. <Ref. to AB-
17, Airbag Control
Module.>

Go to step 3.

3

CHECK AIRBAG MAIN HARNESS AND
FRONT SUB-SENSOR HARNESS (LH).
1) Disconnect the connector (AB13) from the

front sub-sensor. <Ref. to AB-20, Front
Sub Sensor.>

2) Connect connector (1H) in test harness H

to connector (AB13).

3) Measure the resistance between connector

(3I) in test harness I2 and connector (3H) in
test harness H.

Connector & terminal

(3I) No. 3 — (3H) No. 5:
(3I) No. 1 — (3H) No. 6:

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

10

Ω

Go to step 4.

Go to step 5.

4

CHECK AIRBAG MAIN HARNESS AND
FRONT SUB-SENSOR HARNESS (LH).
Measure the resistance between connector
(3I) in test harness I2 and the chassis ground.

Connector & terminal

(3I) No. 3 — Chassis ground:
(3I) No. 1 — Chassis ground:

Does the measured value exceed the specified
value?

1 M

Ω

Go to step 9.

Go to step 5.