Subaru Legacy IV (2008 year). Manual - part 939

 

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Subaru Legacy IV (2008 year). Manual - part 939

 

 

VDC(diag)-71

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

AI: DTC C0054 BLS ON MALFUNCTION

DTC DETECTING CONDITION:
Defective stop light switch
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:

1 2
3 4

9

4

7

6

2

1
5

3
8

B65

B159

B310

30

VDCCM & H/U

59

B159

B225

B65

3

2

E

MAIN SBF

SBF-2

No.8

7.5A

3

4

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

VDC00502

B225

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

BATTERY

STOP LIGHT 
SWITCH

FUSE
(RELAY BLOCK)

VDC(diag)-72

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK STOP LIGHT SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the stop light switch connector.
3) Measure the resistance of stop light switch 
terminals.

Is the resistance 1 M

: or more 

when switch is OFF (when 
pedal is not depressed)?

Go to step 2.

Replace the stop 
light switch.

2

INTERVIEWING CUSTOMERS.
Make sure that the operation was performed in 
which accelerator pedal and brake pedal were 
depressed simultaneously (with depressing 
brake pedal with left foot).

Were the acceleration pedal 
and brake pedal depressed 
simultaneously?

System is normal. 
(DTC may be 
recorded while 
brake is applied 
during driving.)

Go to step 3.

3

CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-23, 
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to 
VDC(diag)-22, Inspection Mode.>
4) Read the DTC. 

Is the same DTC displayed?

Replace the 
VDCCM only. 
<Ref. to VDC-10, 
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)-34, List 
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor 
contact occurs.

VDC(diag)-73

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

AJ:DTC C0054 BLS OFF MALFUNCTION

DTC DETECTING CONDITION:
Defective stop light switch
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:

1 2
3 4

9

4

7

6

2

1
5

3
8

B65

B159

B310

30

VDCCM & H/U

59

B159

B225

B65

3

2

E

MAIN SBF

SBF-2

No.8

7.5A

3

4

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

VDC00502

B225

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

BATTERY

STOP LIGHT 
SWITCH

FUSE
(RELAY BLOCK)

VDC(diag)-74

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK STOP LIGHT SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the stop light switch connector.
3) Measure the resistance of stop light switch 
terminals.

Is the resistance 0.5 

: or less 

when the switch is ON (when 
pedal is depressed)?

Go to step 2.

Replace the stop 
light switch.

2

CHECK POWER SUPPLY OF STOP LIGHT 
SWITCH.
Measure the voltage between the stop light 
switch terminal and chassis ground.

Connector & terminal

(B65) No. 2 (+) — Chassis ground (–):

Is the voltage 10 — 15 V?

Go to step 3.

Repair the power 
supply circuit of 
stop light.

3

CHECK STOP LIGHT SWITCH HARNESS.
1) Disconnect the connector from the 
VDCCM&H/U.
2) Measure the resistance between 
VDCCM&H/U and stop light switch.

Connector & terminal

(B65) No. 3 — (B310) No. 30:

Is the resistance less than 0.5 

:? Go to step 4.

Repair the stop 
light switch circuit.

4

CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in connec-

tor between stop light switch 
and VDCCM&H/U?

Repair the connec-
tor.

Go to step 5.

5

CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-23, 
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to 
VDC(diag)-22, Inspection Mode.>
4) Read the DTC. 

Is the same DTC displayed?

Replace the 
VDCCM only. 
<Ref. to VDC-10, 
REPLACEMENT, 
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)-34, List 
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor 
contact occurs.

 

 

 

 

 

 

 

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