Subaru Legacy (2005 year). Manual - part 792

VDC(diag)-33

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Warning Light Illumination Pattern

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)-23, 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 
VDCCM&H/U.
3) Disconnect the connector (i10) from combi-
nation meter.
4) Measure the resistance between 
VDCCM&H/U connector and combination 
meter connector.

Connector & terminal

(B310) No. 35 — (i10) No. 5:

Is the resistance less than 0.5 
Ω?

Go to step 3.

Repair the har-
ness connector 
between 
VDCCM&H/U and 
combination 
meter.

3

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

Is there poor contact?

Repair the con-
nector.

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

(i10) No. 5 — Chassis ground:

Is the resistance less than 0.5 
Ω?

Check the combi-
nation meter.

Replace the 
VDCCM&H/U.

Step

Check

Yes

No

1

READ DTC.
Read the DTC. <Ref. to VDC(diag)-23, 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)-24, 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&H/U.

Repair the combi-
nation meter.

VDC(diag)-34

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Warning Light Illumination Pattern

F: VDC WARNING LIGHT AND VDC OFF INDICATOR LIGHT DO NOT GO OFF

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

NOTE:
When pressing the VDC OFF switch for more than 10 seconds, the VDC OFF indicator light goes off and can-
not operate any more. When turning the ignition switch from OFF to ON, the OFF operation enabled status
is restored.

Step

Check

Yes

No

1

READ DTC.
Read the DTC. <Ref. to VDC(diag)-23, Read 
Diagnostic Trouble Code (DTC).>

Is DTC displayed?

Perform the diag-
nosis according to 
DTC.

Go to step 2.

2

CHECK ENGINE.

Does the malfunction indicator 
light illuminate?

Repair the engine. Go to step 3.

3

CHECK ENGINE COOLANT TEMPERA-
TURE.
Warm up the engine and check if VDC warning 
light and VDC OFF indicator light illumination 
condition changes.

When the engine coolant tem-
perature is too low, VDC warn-
ing light and VDC OFF 
indicator light illuminate. Do 
the lights go off when the 
engine is warmed-up?

Normal Operation Go to step 4.

4

CHECK VDC OFF SWITCH.
Remove and check VDC OFF switch.

Is VDC OFF switch normal?

Go to step 5.

Replace the VDC 
OFF switch.

5

CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. <Ref. to 
LAN(diag)-24, 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 6.

6

CHECK COMBINATION METER.
Check the combination meter.

Is combination meter OK?

Replace the 
VDCCM&H/U.

Repair the combi-
nation meter.

VDC(diag)-35

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Warning Light Illumination Pattern

G: BRAKE WARNING LIGHT DOES NOT GO OFF

DETECTING CONDITION:
• Brake warning light circuit is shorted.
• Defective sensor/connector
TROUBLE SYMPTOM:
After starting the engine, the brake warning light is kept on though the parking lever is released.
WIRING DIAGRAM:
• LHD model

B310

i1

B16

1
2

B38

E

MAIN SBF

SBF-6

E

No.5

B16

B97

R1

R4

A3

A4

5

1
2

1

2

B229

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

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

B229

1 2

A:

BATTERY

IGNITION
SWITCH

BRAKE FLUID
LEVEL SWITCH

PARKING
BRAKE
SWITCH

BRAKE

WARNING

LIGHT

ABS

WARNING

LIGHT

20

35

B310

B38

i3

i10

A:

VDCCM & H/U

A7

1 2 3 4

11 12 13 14
27 28 29 30

15 16 17 18
31 32 33 34

19 20 21 22
35 36 37 38

23 24 25 26
39 40 41 42

5

6

7

8

9

10

20

9

16

B36

i1

A8

A5

B97

1 2 3

4 5 6 7

8 9 10 11 12 13 14 15 16

VDC00298

VDC(diag)-36

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Warning Light Illumination Pattern

• RHD model

B310

i1

B16

1
2

B97

E

MAIN SBF

SBF-6

E

No.5

B16

B97

R1

R4

A3

A4

5

A8

16

1
2

1

2

B229

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

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

B229

1 2

A:

BATTERY

IGNITION
SWITCH

BRAKE FLUID
LEVEL SWITCH

PARKING
BRAKE
SWITCH

BRAKE

WARNING

LIGHT

ABS

WARNING

LIGHT

20

35

B310

B36

i1

i10

A:

VDCCM & H/U

A8

A5

16

3

A7

4

1 2 3 4

11 12 13 14
27 28 29 30

15 16 17 18
31 32 33 34

19 20 21 22
35 36 37 38

23 24 25 26
39 40 41 42

5

6

7

8

9

10

VDC00318