Subaru Legacy (2005 year). Service manual — part 766

ABS(diag)-29

ABS (DIAGNOSTICS)

ABS Warning Light / Brake Warning Light Illumination Pattern

B: ABS WARNING LIGHT DOES NOT COME ON

DETECTING CONDITION:
• Defective combination meter
• Defective harness
TROUBLE SYMPTOM:
When the ignition switch is turned to ON (engine OFF), ABS warning light does not come on.
WIRING DIAGRAM:
• LHD model

ABS00593

BATTERY

IGNITION
SWITCH

MAIN SBF

SBF-6

No.5

No.33

A:

i10

COMBINATION
METER

E

E

B301

4

5

18

15

22

ABSCM & H/U

7

8

ABS

WARNING

LIGHT

BRAKE

WARNING

LIGHT

i3

B38

3

1 2 3 4 5 6 7 8 9 10 11

16 17 18 19 20 21 22 23 24 25 26

13

12

15

14

i10

2

1

3 4

6 7 8 9 10

22

21

20

19

18

17

16

15

14

13

12

11

5

A:

B301

20

9

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

B38

ABS(diag)-30

ABS (DIAGNOSTICS)

ABS Warning Light / Brake Warning Light Illumination Pattern

• RHD model

ABS00684

BATTERY

IGNITION
SWITCH

MAIN SBF

SBF-6

No.5

No.33

A:

i10

COMBINATION
METER

E

E

B301

4

5

18

15

22

ABSCM & H/U

7

8

ABS

WARNING

LIGHT

BRAKE

WARNING

LIGHT

i1

B36

3

1 2 3 4 5 6 7 8 9 10 11

16 17 18 19 20 21 22 23 24 25 26

13

12

15

14

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

i10

2

1

3 4

6 7 8 9 10

22

21

20

19

18

17

16

15

14

13

12

11

5

A:

B301

i1

4

3

ABS(diag)-31

ABS (DIAGNOSTICS)

ABS Warning Light / Brake Warning Light Illumination Pattern

Step

Check

Yes

No

1

CHECK ILLUMINATION OF OTHER LIGHTS.
Turn the ignition switch to ON. (engine OFF)

Do other warning lights illumi-
nate?

Go to step 2.

Check the combi-
nation meter.

2

READ DTC.
Read the DTC. <Ref. to ABS(diag)-24, Read
Diagnostic Trouble Code (DTC).>

Is DTC displayed?

Perform the diag-
nosis according to
DTC.

Go to step 3.

3

CHECK GROUND SHORT OF HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector (B301) from
ABSCM&H/U.
3) Disconnect the connector (i10) from the
combination meter.
4) Measure the resistance between
ABSCM&H/U connector and chassis ground.

Connector & terminal

(B301) No. 22 — Chassis ground:

Is the resistance more than 1
M

Ω?

Go to step 4.

Repair the har-
ness and connec-
tor between
ABSCM&H/U and
combination
meter.

4

CHECK ABSCM.
1) Connect the connector (B301) to the
ABSCM&H/U.
2) Turn the ignition to ON.
3) Immediately after turning ignition switch to
ON (within 1.5 seconds), measure the resis-
tance between the combination meter connec-
tor and chassis ground.

Connector & terminal

(i10) No. 5 — Chassis ground:

Is the resistance more than 1
M

Ω?

Check the combi-
nation meter.

Replace the
ABSCM only.
<Ref. to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>

ABS(diag)-32

ABS (DIAGNOSTICS)

ABS Warning Light / Brake Warning Light Illumination Pattern

C: ABS WARNING LIGHT DOES NOT GO OFF

DETECTING CONDITION:
• Defective combination meter
• Open in harness
TROUBLE SYMPTOM:
When starting the engine, the ABS warning light is kept on.
WIRING DIAGRAM:
• LHD model

ABS00593

BATTERY

IGNITION
SWITCH

MAIN SBF

SBF-6

No.5

No.33

A:

i10

COMBINATION
METER

E

E

B301

4

5

18

15

22

ABSCM & H/U

7

8

ABS

WARNING

LIGHT

BRAKE

WARNING

LIGHT

i3

B38

3

1 2 3 4 5 6 7 8 9 10 11

16 17 18 19 20 21 22 23 24 25 26

13

12

15

14

i10

2

1

3 4

6 7 8 9 10

22

21

20

19

18

17

16

15

14

13

12

11

5

A:

B301

20

9

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

B38