Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 544

VDC(diag)-75

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

AD:DTC C0052 MOTOR AND MOTOR RELAY ON FAILURE

DTC DETECTING CONDITION:

• Defective motor relay

• Defective harness connector

TROUBLE SYMPTOM:

• ABS does not operate.

• VDC does not operate.

• EBD may not operate.

WIRING DIAGRAM:

Vehicle Dynamics Control System <Ref. to WI-67, Vehicle Dynamics Control System.>

B310

E

23

25

VDCCM & H/U

2

8

PUMP MO

T

OR

M

FL INLET

MAIN SBF

SBF-6

No.33

E

BATTERY

IGNITION

SWITCH

SOLENOID

V

AL

VE

MO

T

OR RELA

Y

VALVE RELAY

FR INLET

RL INLET

RR INLET

FL OUTLET

FR OUTLET

RL OUTLET

RR OUTLET

P

R

IM

A

RY

C

U

T

S

E

C

O

N

D

A

RY

C

U

T

P

R

IM

A

RY

S

U

C

T

IO

N

SBF-1

E

22

S

E

C

O

N

D

A

RY

S

U

C

T

IO

N

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

VDC00467

VDC(diag)-76

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

AE:DTC C0052 MOTOR MALFUNCTION

DTC DETECTING CONDITION:

• Defective motor

• Defective motor relay

• Defective harness connector

TROUBLE SYMPTOM:

• ABS does not operate.

• VDC does not operate.

• EBD may not operate.
NOTE:

For the diagnostic procedure, refer to “DTC C0052 MOTOR AND MOTOR RELAY OFF FAILURE”. <Ref. to

VDC(diag)-73, DTC C0052 MOTOR AND MOTOR RELAY OFF FAILURE, Diagnostic Procedure with Diag-

nostic Trouble Code (DTC).>

Step

Check

Yes

No

1

CHECK INSTALLATION OF MOTOR
GROUND.

Is the motor ground terminal
installation bolt tightened 33
N·m (3.4 kgf-m, 24.3 ft-lb)?

Go to step

2.

Tighten the motor
ground terminal
installation bolt.

2

CHECK VDCCM&H/U MOTOR RELAY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the
VDCCM&H/U.
3) Measure the resistance between
VDCCM&H/U terminals.

Terminals

No. 23 — No. 22:

Is the resistance 1 MΩ or
more?

Go to step

3.

Replace the
VDCCM&H/U.
<Ref. to VDC-8,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>

3

CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-27,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-26, Inspection Mode.>
4) Read the DTC.

Is the same DTC displayed?

Replace the
VDCCM only.
<Ref. to VDC-12,
REPLACEMENT,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>

Go to step

4.

4

CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diag-
nosis according to
DTC. <Ref. to
VDC(diag)-48, List
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor
contact occurs.
NOTE:

Though the ABS
warning light re-
mains on at this
time, this is normal.
Drive the vehicle at
12 km/h (7 MPH)
or more in order to
turn ABS warning
light off. Be sure to
drive the vehicle
and check that the
warning light goes
off.

VDC(diag)-77

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

AF:DTC C0054 BLS CIRCUIT OPEN

DTC DETECTING CONDITION:

Defective stop light switch

TROUBLE SYMPTOM:

• ABS does not operate.

• VDC does not operate.

WIRING DIAGRAM:

Vehicle dynamics control system <Ref. to WI-67, Vehicle Dynamics Control System.>

B225

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

22

9

15

1 2
3 4

B225

21

5Dr

4Dr

7

4Dr

4Dr

6

7

9

4

7

6

2

1
5

3
8

B65

1 2
3 4

1 2 3 4 5

B65

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

1 2

3 4 5

6 7 8 9 10 11 12

13
14

15 16

17

27

24

25
26

20

21
22

23

29
30

31

28

32 35

33
34

37
38

39

36

40

8

9

10

11 12

1

2

5

3

4

7

6

19

18

B310

30

B65

B434

B159

R168

B99

R3

B99

R3

B435

*

1

*

2

5Dr

5Dr

*

1

*

2

B159

R168

B99

B434

B435

5Dr

4Dr

VDC00819

VDCCM & H/U

E

:

:

SBF-2

: 4 DOOR MODEL : 4

5 DOOR MODEL : 2

: 4 DOOR MODEL : 3

5 DOOR MODEL : 1

BATTERY

No. 8

MAIN SBF

STOP LIGHT &

BRAKE SWITCH

: 4 DOOR MODEL

: 5 DOOR MODEL

FUSE & RELAY BOX

(F/B)

FUSE

(RELA

Y BLOCK)

7.5A

VDC(diag)-78

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK OUTPUT OF STOP LIGHT SWITCH
WITH SUBARU SELECT MONITOR.
1) Select “Current Data Display & Save” on the
Subaru Select Monitor. <Ref. to VDC(diag)-19,
READ CURRENT DATA, OPERATION, Subaru
Select Monitor.>
2) Release the brake pedal.
3) Read the «Brake Switch» using the Subaru
Select Monitor.

Is “OFF” displayed on the
screen?

Go to step

2.

Go to step

3.

2

CHECK OUTPUT OF STOP LIGHT SWITCH
WITH SUBARU SELECT MONITOR.
1) Depress the brake pedal.
2) Read the «Brake Switch» using the Subaru
Select Monitor.

Is “ON” displayed on the
screen?

Go to step

6.

Go to step

3.

3

CHECK IF STOP LIGHTS ILLUMINATE.
Depress the brake pedal.

Does the stop light illuminate? Go to step

4.

Repair the stop
light circuit.

4

CHECK FUSE.
Check the fuse (B225) in the relay block.

Is the fuse OK?

Go to step

5.

Replace the fuse.

5

CHECK OPEN CIRCUIT OF HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the
VDCCM&H/U.
3) Depress the brake pedal.
4) Measure the voltage between VDCCM&H/U
connector and chassis ground.

Connector & terminal

(B310) No. 30 (+) — Chassis ground (–):

Is the voltage 10 — 15 V?

Go to step

6.

Repair the harness
between stop light
switch and
VDCCM&H/U con-
nector.

6

CHECK POOR CONTACT OF CONNEC-
TORS.

Is there poor contact of connec-
tor between stop light switch
and VDCCM&H/U?

Repair the connec-
tor.

Go to step

7.

7

CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-27,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-26, Inspection Mode.>
4) Read the DTC.

Is the same DTC displayed?

Replace the
VDCCM only.
<Ref. to VDC-12,
REPLACEMENT,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>

Go to step

8.

8

CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diag-
nosis according to
DTC. <Ref. to
VDC(diag)-48, List
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor
contact occurs.