Subaru Legacy IV (2008 year). Service manual — part 929

VDC(diag)-31

Warning Light Illumination Pattern

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

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 10 seconds or more, the VDC OFF indicator light goes off and cannot
operate any more. When turning the ignition switch from OFF to ON, the OFF operation enabled status is re-
stored.

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 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. <Ref. to
VDC-24, VDC OFF Switch.>

Is the 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)-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 6.

6

CHECK COMBINATION METER.
Check the combination meter.

Is combination meter OK?

Replace the
VDCCM only.

Repair the combi-
nation meter.

VDC(diag)-32

Warning Light Illumination Pattern

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

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 remains lit though the parking lever is released.
WIRING DIAGRAM:

B16

1
2

i10

2

1

3 4

6 7 8 9 10

22

21

20

19

18

17

16

15

14

13

12

11

5

A:

B:

E

MAIN SBF

SBF-6

E

No.5

8

B310

B36

B16

i1

B38

i3

B404

i10

A:

i11

B:

VDCCM & H/U

A3

A7

20

16

15

1
2

1

*

2

*

2

*

B38

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

i1

5 6 7 8

2

1

9

4

3

10

24

22

23

25

27

26

28

11 12 13

14 15 16

17 18 19 20 21

VDC00658

1

*

1 2 3

4 5 6

7 8 9 10 11 12 13 14

i11

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

BATTERY

IGNITION
SWITCH

COMBINATION
METER

PARKING BRAKE
FLUID LEVEL
WARNING LIGHT

BRAKE FLUID
LEVEL SWITCH

PARKING

SWITCH

: NORMAL METER
METER WITH MID

: A8
: A4

: NORMAL METER
METER WITH MID

: B10
: A8

REVERSE

CIRCUIT

VDC(diag)-33

Warning Light Illumination Pattern

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK INSTALLATION OF VDCCM&H/U
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Check that the VDCCM&H/U connector is
inserted until it is locked by clamp.

Is the connector firmly
inserted?

Go to step 2.

Insert the
VDCCM&H/U con-
nector until it is
locked by clamp.

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 BRAKE FLUID AMOUNT.
Check the amount of brake fluid in the reservoir
tank of master cylinder.

Is the amount of brake fluid
between the lines of “MAX” and
“MIN”?

Go to step 4.

Replenish brake
fluid to the speci-
fied value.

4

CHECK BRAKE FLUID LEVEL SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the level switch connector (B16)
from master cylinder.
3) Measure the resistance of master cylinder
terminals.

Terminals

No. 1 — No. 2:

Is the resistance 1 M

: or

more?

Go to step 5.

Replace the mas-
ter cylinder.

5

CHECK PARKING BRAKE SWITCH.
1) Disconnect the connector (B404) from park-
ing brake switch.
2) Release the parking brake.
3) Measure the resistance between parking
brake switch terminal and chassis ground.

Is the resistance 1 M

: or

more?

Go to step 6.

Replace the park-
ing brake switch.

6

CHECK GROUND SHORT OF HARNESS.
1) Disconnect the connectors (i10 and i11)
from the combination meter.
2) Measure the resistance between combina-
tion meter connector and chassis ground.

Connector & terminal

Normal meter model

(i10) No. 8 — Chassis ground:
(i11) No. 10 — Chassis ground:

Meter with MID model

(i10) No. 8 — Chassis ground:
(i10) No. 4 — Chassis ground:

Is the resistance 1 M

: or

more?

Go to step 7.

Repair the harness
connector between
combination meter
and brake fluid
level switch or
parking brake
switch.

7

CHECK HARNESS CONNECTOR.
1) Disconnect the connector (B310) from the
VDCCM&H/U.
2) Disconnect the connector (i10) from combi-
nation meter.
3) Measure the resistance between
VDCCM&H/U connector and combination
meter connector.

Connector & terminal

(B310) No. 8 — (i10) No. 7:

Is the resistance less than 0.5

:? Go to step 8.

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

8

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

Is there poor contact?

Repair the connec-
tor.

Go to step 9.

9

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

Connector & terminal

(i10) No. 7 — Chassis ground:

Is the resistance less than 0.5

:? Check the combi-

nation meter.

Replace the
VDCCM only.

VDC(diag)-34

List of Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

11.List of Diagnostic Trouble Code (DTC)

A: LIST

DTC

Detailed

code

Display

Content of diagnosis

Reference target

C0021

07B0H

Front Right ABS Sensor
Circuit Open or Shorted
Battery

Open/high input of front
ABS wheel speed sen-
sor RH

<Ref. to VDC(diag)-39, DTC C0021 FRONT
RIGHT ABS SENSOR CIRCUIT OPEN OR
SHORT, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>

C0022

072FH
0736H
0737H
0738H
073AH

073CH

Front Right ABS Sensor
Signal

Front ABS wheel speed
sensor RH signal mal-
function

<Ref. to VDC(diag)-42, DTC C0022 FRONT
RIGHT ABS SENSOR SIGNAL, Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>

C0023

06B0H

Front Left ABS Sensor
Circuit Open or Shorted
Battery

Open/high input of front
ABS wheel speed sen-
sor LH

<Ref. to VDC(diag)-39, DTC C0023 FRONT LEFT
ABS SENSOR CIRCUIT OPEN OR SHORT,
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>

C0024

062FH
0636H
0637H
0638H
063AH

063CH

Front Left ABS Sensor
Signal

Front ABS wheel speed
sensor LH signal mal-
function

<Ref. to VDC(diag)-42, DTC C0024 FRONT LEFT
ABS SENSOR SIGNAL, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>

C0025

09B0H

Rear Right ABS Sensor
Circuit Open or Shorted
Battery

Open/high input of rear
ABS wheel speed sen-
sor RH

<Ref. to VDC(diag)-39, DTC C0025 REAR RIGHT
ABS SENSOR CIRCUIT OPEN OR SHORT,
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>

C0026

092FH
0936H
0937H
0938H
093AH

093CH

Rear Right ABS Sensor
Signal

Rear ABS wheel speed
sensor RH signal mal-
function

<Ref. to VDC(diag)-42, DTC C0026 REAR RIGHT
ABS SENSOR SIGNAL, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>

C0027

08B0H

Rear Left ABS Sensor
Circuit Open or Shorted
Battery

Open/high input of rear
ABS wheel speed sen-
sor LH

<Ref. to VDC(diag)-40, DTC C0027 REAR LEFT
ABS SENSOR CIRCUIT OPEN OR SHORT,
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>

C0028

082FH
0836H
0837H
0838H
083AH

083CH

Rear Left ABS Sensor
Signal

Rear ABS wheel speed
sensor LH signal mal-
function

<Ref. to VDC(diag)-43, DTC C0028 REAR LEFT
ABS SENSOR SIGNAL, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>

C0029

0A11H
0A21H
0A42H
0A46H
0A50H

Any One of Four ABS
Sensors Signal

ABS wheel speed sen-
sor signal malfunction
in one of four wheels

<Ref. to VDC(diag)-46, DTC C0029 ANY OF
WHEEL SENSORS SIGNAL, Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>

C0031

0DB8H
0DC0H

FR Hold Valve malfunc-
tion

Front inlet solenoid
valve RH malfunction in
VDCCM&H/U

<Ref. to VDC(diag)-48, DTC C0031 FR HOLD
VALVE MALFUNCTION, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>

C0032

0EB8H
0EC0H

FR Pressure Reducing
Valve malfunction

Front outlet solenoid
valve RH malfunction in
VDCCM&H/U

<Ref. to VDC(diag)-48, DTC C0032 FR PRES-
SURE REDUCING VALVE MALFUNCTION,
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>