Subaru Legacy (2005 year). Manual - part 804

VDC(diag)-81

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AK:DTC C0052 MOTOR/MOTOR RELAY MALFUNCTION

DTC DETECTING CONDITION:
• Defective motor and motor relay
• Defective harness connector
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
• EBD may not operate.
WIRING DIAGRAM:

VDC00321

B310

E

9

6

VDCCM & H/U

14

M

MAIN SBF

SBF-6

No.33

E

SBF-1

B310

22 23 24 25 26

21

20

19

16

15

14

13

12

11

4

5

6

7

8

9

10

3

2

1

17 18

38 39 40 41 42

37

36

35

32

31

30

29

28

27

33 34

E

10

BATTERY

IGNITION
SWITCH

SOLENOID

   VALVE

PUMP  MOTOR

FL INLET

RL INLET

FR INLET

RR INLET

FL OUTLET

RL OUTLET

FR OUTLET

RR OUTLET

MOTOR RELAY

PRIMARY SUCTION

PRIMARY CUT

SECONDARY CUT

VALVE RELAY

SECONDARY SUCTION

VDC(diag)-82

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK INPUT VOLTAGE FOR VDCCM&H/
U.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from VDCCM&H/
U.
3) Turn the ignition switch to ON.
4) Measure the voltage between VDCCM&H/
U connector and chassis ground.

Connector & terminal

(B310) No. 9 (+) — Chassis ground (

−

):

(B310) No. 14 (+) — Chassis ground (

−

):

Is the voltage 10 — 15 V?

Go to step 2.

Repair the power 
supply circuit in 
VDCCM&H/U.

2

CHECK GROUND CIRCUIT OF VDCCM&H/U.
1) Turn the ignition switch to OFF.
2) Measure the resistance between 
VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 6 — Chassis ground:
(B310) No. 10 — Chassis ground:

Is the resistance less than 0.5 
Ω?

Go to step 3.

Repair the 
VDCCM&H/U 
ground harness.

3

CHECK MOTOR RELAY FOR VDCCM&H/U.
Measure the resistance between VDCCM&H/U 
connector terminals.

Terminals

No. 9 — No. 10:

Is the resistance more than 1 
M

Ω?

Go to step 4.

Replace the 
VDCCM&H/U.

4

CHECK POOR CONTACT IN CONNECTORS.
Turn the ignition switch to OFF.

Is there poor contact in con-
nector between generator, bat-
tery and VDCCM&H/U?

Repair the con-
nector.

Go to step 5.

5

CHECK VDCCM&H/U.
1) Connect all the connectors.
2) Perform the clear memory mode.
3) Perform the inspection mode.
4) Read the DTC.

Is the same DTC displayed?

Replace the 
VDCCM&H/U. 
<Ref. to VDC-7, 
VDC Control Mod-
ule and Hydraulic 
Control Unit 
(VDCCM&H/U).>

Go to step 6.

6

CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diag-
nosis according to 
DTC. <Ref. to 
VDC(diag)-38, List 
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor 
contact occurs.

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

VDC(diag)-83

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AL:DTC C0052 MOTOR/MOTOR RELAY OFF MALFUNCTION

DTC DETECTING CONDITION:
• 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 / MOTOR RELAY MALFUNCTION” <Ref. to
VDC(diag)-81, DTC C0052 MOTOR/MOTOR RELAY MALFUNCTION, Diagnostic Procedure with Diagnos-
tic Trouble Code (DTC).>

VDC(diag)-84

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AM:DTC C0052 MOTOR/MOTOR RELAY ON MALFUNCTION

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:

VDC00321

B310

E

9

6

VDCCM & H/U

14

M

MAIN SBF

SBF-6

No.33

E

SBF-1

B310

22 23 24 25 26

21

20

19

16

15

14

13

12

11

4

5

6

7

8

9

10

3

2

1

17 18

38 39 40 41 42

37

36

35

32

31

30

29

28

27

33 34

E

10

BATTERY

IGNITION
SWITCH

SOLENOID

   VALVE

PUMP  MOTOR

FL INLET

RL INLET

FR INLET

RR INLET

FL OUTLET

RL OUTLET

FR OUTLET

RR OUTLET

MOTOR RELAY

PRIMARY SUCTION

PRIMARY CUT

SECONDARY CUT

VALVE RELAY

SECONDARY SUCTION