Subaru Legacy (2005 year). Manual — part 899

AB(diag)-33

AIRBAG SYSTEM (DIAGNOSTICS)

Clear Memory Mode

10.Clear Memory Mode

A: OPERATION

1) Remove the instrument panel lower cover under.
2) Disconnect the ground terminal harness from
check connector harness on the side of heater unit.

NOTE:
The harness (black) of ground terminal is wrapped
by tapes with the harness of check connector.
3) Turn the ignition switch to ON.
4) Connect one of the ground terminals to the
check connector terminal No. 2.

CAUTION:
Do not connect the ground terminal to the con-
nector except for the check connector terminal
No. 2 and No. 3.
5) While the warning light blinks, connect another
ground terminal to the check connector terminal
No. 3.
6) Once the memory is erased, the warning light re-
turns the normal blink rate (0.6 sec. on). If normal
blink rate is not displayed, defective in parts still re-
main. Having repaired such parts, erase the mem-
ory again and confirm that the blink rate has
returned to normal.
7) After the memory has been cleared, disconnect
the ground terminal from the check connector.
8) Wind the tape around the ground terminal and
return it to its original position.

AB-01199

AB-00847

1

2 3

4 5

6 7

8

9 10

11 12

13 14

AB(diag)-34

AIRBAG SYSTEM (DIAGNOSTICS)

Airbag Warning Light Failure

11.Airbag Warning Light Failure

A: AIRBAG WARNING LIGHT REMAINS ON

DETECTING CONDITION:
• Airbag warning light is faulty.
• Airbag control module to airbag warning light circuit is shorted or open.
• Grounding circuit is faulty.
• Airbag control module is faulty.
• (AB1) and (B31) are not connected properly.
• (AB6) is not connected properly to airbag control module.

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.
WIRING DIAGRAM:

AB6

B31

AB1

No.5

3

A13

A3

A4

AB6

i10

3 4

1

2

5 6

AB1

i10

B36

i1

i1

1

14

AB-00661

IGNITION
SWITCH

AIRBAG

INDICATOR

LIGHT

AIRBAG

CIRCUIT

BATTERY

AIRBAG CONTROL MODULE

1 2

3 4

5 6 7 8 9 10

16

11

15

14

13

12

17

19

18

23

25

24

20

22

21

26

28

27

2

1

3 4

6 7 8 9 10

22

21

20

19

18

17

16

15

14

13

12

11

5

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

AB(diag)-35

AIRBAG SYSTEM (DIAGNOSTICS)

Airbag Warning Light Failure

Step

Check

Yes

No

1

CHECK POOR CONTACT.
1) Turn the ignition switch OFF, disconnect the
battery ground cable, and wait more than 20
seconds.
2) Confirm that the firm contact is secured
between the airbag control module and con-
nector (AB6).

Is there poor contact in con-
nector (AB6)?

Replace the airbag
main harness with
body harness or
replace the airbag
control module.
<Ref. to AB-22,
Airbag Control
Module.>

Go to step 2.

2

CHECK AIRBAG MAIN HARNESS.
1) Remove the instrument panel lower cover
and disconnect the connectors (AB7) and
(AB2).
2) Remove the instrument panel side cover on
passenger’s side and disconnect the connec-
tors (AB10) and (AB9).
3) Disconnect the connector (AB6) from air-
bag control module, and connect the connector
(1U) in the test harness U.
4) Connect the battery ground cable and turn
the ignition switch to ON.
5) Connect the connectors (7U) and (8U) in
the test harness U.

NOTE:

After defective has been eliminated, disconnect
the connectors (7U) and (8U).

Does the airbag warning light
go off?

Go to step 3.

Go to step 4.

3

CHECK GROUND CIRCUIT.
1) Turn the ignition switch OFF, disconnect the
battery ground cable, and wait more than 20
seconds.
2) Disconnect the connector (AB6) from air-
bag control module.
3) Connect the connector (1U) in the test har-
ness U to body harness connector (AB6).
4) Measure the resistance between connector
(2U) in the test harness U and chassis ground.

Connector & terminal

(2U) No. 10 — Chassis ground:
(2U) No. 11 — Chassis ground:

Is the resistance less than 10
Ω?

Replace the airbag
control module.
<Ref. to AB-22,
Airbag Control
Module.>

Repair the chas-
sis ground circuit.

4

CHECK AIRBAG MAIN HARNESS AND
BODY HARNESS.
1) Disconnect the connectors (7U) and (8U).
2) Remove the combination meter.
3) Measure the resistance between connector
(i10) and connector (2U) in the test harness U.

Connector & terminal

(2U) No. 7 — (i10) No. 13:

Is the resistance less than 10
Ω?

Replace the com-
bination meter
printed circuit.
<Ref. to IDI-15,
Combination
Meter.>

Go to step 5.

5

CHECK POOR CONTACT IN CONNECTORS
(AB1) AND (B31).
1) Turn the ignition switch OFF, disconnect the
battery ground terminal, and wait more than 20
seconds.
2) Confirm that firm contact is secured
between connectors (AB1) and (B31).

Is there poor contact in con-
nectors (AB1) and (B31)?

Repair the body
harness or replace
the airbag main
harness with body
harness.

Go to step 6.

6

CHECK AIRBAG MAIN HARNESS.
Check the airbag main harness for abnormali-
ties.

Is anything unusual to airbag
main harness?

Replace the airbag
main harness with
body harness.

Repair the body
harness.

AB(diag)-36

AIRBAG SYSTEM (DIAGNOSTICS)

Airbag Warning Light Failure

B: AIRBAG WARNING LIGHT REMAINS OFF

DETECTING CONDITION:
• Fuse No. 5 (in fuse box) is blown.
• Body harness circuit is open.
• Airbag warning light is faulty.
• Airbag main 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 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.
WIRING DIAGRAM:

AB6

B31

AB1

No.5

3

A13

A3

A4

AB6

i10

3 4

1

2

5 6

AB1

i10

B36

i1

i1

1

14

AB-00661

IGNITION
SWITCH

AIRBAG

INDICATOR

LIGHT

AIRBAG

CIRCUIT

BATTERY

AIRBAG CONTROL MODULE

1 2

3 4

5 6 7 8 9 10

16

11

15

14

13

12

17

19

18

23

25

24

20

22

21

26

28

27

2

1

3 4

6 7 8 9 10

22

21

20

19

18

17

16

15

14

13

12

11

5

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