Subaru Legacy IV (2008 year). Service manual — part 928

VDC(diag)-27

Warning Light Illumination Pattern

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

C: 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 illuminate.
WIRING DIAGRAM:

MAIN SBF

SBF-6

No.5

No.33

A:

i10

B:

i11

E

E

B310

28

25

32

VDCCM & H/U

A7

8

i3

B38

A3

i10

2

1

3 4

6 7 8 9 10

22

21

20

19

18

17

16

15

14

13

12

11

5

A:

*

*

i11

B:

2

1

3

4 5 6

14

13

12

11

10

9

8

7

B310

4 5 6 7 8 9

26 27 28 29 30

2 3

1

31 32 33 34 35 36

10 11

14 15 16 17 18 19

37 38 39 40

12 13

41 42 43 44 45 46

20 21

23

24

22

25

VDC00657

20

9

B38

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

BATTERY

IGNITION
SWITCH

COMBINATION
METER

: NORMAL METER
METER WITH MID

BRAKE

W

ARNING

LIGHT

ABS

W

ARNING

LIGHT

: A5
: B5

REVERSE

CIRCUIT

REVERSE

CIRCUIT

VDC(diag)-28

Warning Light Illumination Pattern

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK OTHER LIGHTS TURN ON.
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 VDC(diag)-21, Read
Diagnostic Trouble Code (DTC).>

Is DTC displayed?

Perform the diag-
nosis according to
DTC.

Go to step 3.

3

CHECK GROUND SHORT CIRCUIT OF HAR-
NESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector (B310) from the
VDCCM&H/U.
3) Disconnect the connector (i10) or (i11) from
the combination meter.
4) Measure the resistance between
VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 32 — Chassis ground:

Is the resistance 1 M

: or

more?

Go to step 4.

Repair the harness
connector between
VDCCM&H/U and
combination meter.

4

CHECK VDCCM.
1) Connect the connector (B310) to
VDCCM&H/U.
2) Turn the ignition switch to ON.
3) Measure the resistance between the combi-
nation meter connector and chassis ground
soon after the ignition switch is turned to ON
(within 2 seconds).

Connector & terminal

Normal meter model

(i10) No. 5 — Chassis ground:

Meter with MID model

(i11) No. 5 — Chassis ground:

Is the resistance 1 M

: or

more?

Check the combi-
nation meter.

Replace the
VDCCM only.

VDC(diag)-29

Warning Light Illumination Pattern

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

D: ABS WARNING LIGHT DOES NOT GO OFF

DETECTING CONDITION:
• Defective combination meter
• Open circuit of harness
TROUBLE SYMPTOM:
When starting the engine, the ABS warning light is kept ON.
WIRING DIAGRAM:

MAIN SBF

SBF-6

No.5

No.33

A:

i10

B:

i11

E

E

B310

28

25

32

VDCCM & H/U

A7

8

i3

B38

A3

i10

2

1

3 4

6 7 8 9 10

22

21

20

19

18

17

16

15

14

13

12

11

5

A:

*

*

i11

B:

2

1

3

4 5 6

14

13

12

11

10

9

8

7

B310

4 5 6 7 8 9

26 27 28 29 30

2 3

1

31 32 33 34 35 36

10 11

14 15 16 17 18 19

37 38 39 40

12 13

41 42 43 44 45 46

20 21

23

24

22

25

VDC00657

20

9

B38

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

BATTERY

IGNITION
SWITCH

COMBINATION
METER

: NORMAL METER
METER WITH MID

BRAKE

W

ARNING

LIGHT

ABS

W

ARNING

LIGHT

: A5
: B5

REVERSE

CIRCUIT

REVERSE

CIRCUIT

VDC(diag)-30

Warning Light Illumination Pattern

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

E: VDC INDICATOR LIGHT DOES NOT GO OFF

DETECTING CONDITION:
• Defective combination meter
• Defective CAN communication
TROUBLE SYMPTOM:
When starting the engine, VDC indicator light is kept ON.

Step

Check

Yes

No

1

READ DTC.
Read the DTC. <Ref. to VDC(diag)-21, Read
Diagnostic Trouble Code (DTC).>

Is DTC displayed?

Perform the diag-
nosis according to
DTC.

Go to step 2.

2

CHECK WIRING HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector (B310) from the
VDCCM&H/U.
3) Disconnect the connector (i10) or (i11) from
the combination meter.
4) Measure the resistance between
VDCCM&H/U connector and combination
meter connector.

Connector & terminal

Normal meter model

(B310) No. 32 — (i10) No. 5:

Meter with MID model

(B310) No. 32 — (i11) No. 5:

Is the resistance less than 0.5

:? Go to step 3.

Repair the harness
connector between
VDCCM&H/U and
combination meter.

3

CHECK POOR CONTACT IN CONNECTOR.
Check for poor contact in all connectors.

Is there poor contact?

Repair the connec-
tor.

Go to step 4.

4

CHECK VDCCM.
1) Connect the connector (B310) to
VDCCM&H/U.
2) Turn the ignition switch to ON.
3) Measure the resistance between combina-
tion meter connector and chassis ground.

Connector & terminal

Normal meter model

(i10) No. 5 — Chassis ground:

Meter with MID model

(i11) No. 5 — Chassis ground:

Is the resistance less than 0.5

:? Check the combi-

nation meter.

Replace the
VDCCM only.

Step

Check

Yes

No

1

READ DTC.
Read the DTC. <Ref. to VDC(diag)-21, Read
Diagnostic Trouble Code (DTC).>

Is DTC displayed?

Perform the diag-
nosis according to
DTC.

Go to step 2.

2

CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. <Ref. to
LAN(diag)-27, OPERATION, Read Diagnostic
Trouble Code (DTC).>

Is there any fault in LAN sys-
tem?

Perform the diag-
nosis according to
DTC for LAN sys-
tem.

Go to step 3.

3

CHECK COMBINATION METER.
Check the combination meter.

Is combination meter OK?

Replace the
VDCCM only.

Repair the combi-
nation meter.