Subaru Legacy (2005 year). Manual - part 553

4AT(diag)-49

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

E: DTC P0719 TORQUE CONVERTER/BRAKE SWITCH “B” CIRCUIT LOW

DTC DETECTING CONDITION:
Brake switch malfunction, open input signal circuit
TROUBLE SYMPTOM:
• Gear is not shifted down when driving a down hill.
• The neutralizing control does not operate.
WIRING DIAGRAM:
• LHD model

AT-03158

B159

2

1

3 4
8 9

7

6

5

B280

8

7

6

5

4

3

2

1

22

23

21

20

19

16

15

14

13

12

11

10

9

17

30

18

29

28

27

26

25

24

B281

8

7

6

5

4

3

2

1

21

22

20

19

16

15

14

13

12

11

10

9

17 18

28

27

26

25

24

23

B64

2

1

B54

8

3

4

5

6

7

2

1

18 19 20

17

16

15

14

13

12

11

10

9

24

23

22

21

C:

B:

B159

B280

B:

B281

C:

C23

B20

B30

3

5

9

MAIN SBF

SBF-2

No.8

E

B

A

TTER

Y

STOP LIGHT
SWITCH

JOINT
CONNECTOR

BODY INTEGRATED
MODULE

3

12

TCM

B54

2

4

5

7

B352

JOINT
CONNECTOR

B355

JOINT
CONNECTOR

2

WC

WC

1

OC

2

OC

: WITHOUT CRUISE CONTROL

: WITH CRUISE CONTROL

OC

WC

OC

WC

: 

: 

B64

B65

1

2

3

4

B65

1 2 3 4
5 6 7 8

B54

B355

B352

OC

WC

: 

: 

1

*

: TERMINAL No. RANDOM ARRANGEMENT
  AMONG 1,2,5, AND 6

2

*

: TERMINAL No. RANDOM ARRANGEMENT
  AMONG 3,4,7, AND 8

2

*

2

*

1

*

1

*

4AT(diag)-50

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

• RHD model

Step

Check

Yes

No

1

CHECK DTC.

Does the DTC of CAN commu-
nication appear in the on-board 
diagnostics test mode?

Perform the diag-
nosis according to 
DTC.

Go to step 2.

AT-03159

B64

B159

B280

B:

B281

C:

C23

B20

B30

8

B352

2

4

B53

B352

B53

10

9

8

7

6

5

4

3

2

1

20

19

18

17

16

15

14

13

12

11

B54

8

3

4

5

6

7

2

1

18 19 20

17

16

15

14

13

12

11

10

9

24

23

22

21

2

5

1

9

3

12

TCM

B54

MAIN SBF

SBF-2

No.8

E

B

A

TTER

Y

STOP LIGHT
SWITCH

JOINT
CONNECTOR

JOINT
CONNECTOR

JOINT
CONNECTOR

BODY INTEGRATED
MODULE

2

1

3 4

8

7

6

5

B159

2

1

3 4
8 9

7

6

5

B280

8

7

6

5

4

3

2

1

22

23

21

20

19

16

15

14

13

12

11

10

9

17

30

18

29

28

27

26

25

24

B281

8

7

6

5

4

3

2

1

21

22

20

19

16

15

14

13

12

11

10

9

17 18

28

27

26

25

24

23

B64

2

1

C:

B:

6

2

*

2

*

1

*

1

*

1

*

: TERMINAL No. RANDOM ARRANGEMENT
  AMONG 8,18, AND 19

2

*

 : TERMINAL No. RANDOM ARRANGEMENT
   AMONG 9,10, AND 20

4AT(diag)-51

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

2

CHECK FUSE.
1) Turn the ignition switch to OFF.
2) Remove the fuse (No. 8).

Is the fuse (No. 8) blown out?

Replace the fuse 
(No. 8). If the 
replaced fuse (No. 
8) has blown out 
easily, repair the 
short circuit of har-
ness between fuse 
(No. 8) and stop 
light switch.

Go to step 3.

3

CHECK BODY INTEGRATED MODULE.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor to data 
link connector.
3) Turn the ignition switch to ON. (engine 
OFF)
4) Turn the Subaru Select Monitor power 
switch to ON.
5) Depress the brake pedal.
6) Read the data of brake pedal switch using 
Subaru Select Monitor. <Ref. to LAN(diag)-14, 
OPERATION, Subaru Select Monitor.>

Is ON displayed?

Go to step 4.

Go to step 5.

4

CHECK TCM.
Read the data of brake pedal switch using 
Subaru Select Monitor. <Ref. to 4AT(diag)-16, 
OPERATION, Subaru Select Monitor.>

Is ON displayed?

A temporary poor 
contact of connec-
tor or harness may 
be the cause. 
Check the poor 
contact.

Replace the TCM. 
<Ref. to 4AT-66, 
Transmission Con-
trol Module 
(TCM).>

5

CHECK BODY INTEGRATED MODULE IN-
PUT SIGNAL.
1) Depress the brake pedal.
2) Disconnect the connector from body inte-
grated module.
3) Measure the voltage of harness between 
body integrated module and stop light switch.

Connector & terminal

LHD model (With cruise control)

(B281) No. 23 (+) — (B65) No. 3 (

−

):

LHD model (Without cruise control)

(B281) No. 23 (+) — (B64) No. 2 (

−

):

RHD model

(B281) No. 23 (+) — (B64) No. 2 (

−

):

Is the voltage more than 10 V? Go to step 8.

Go to step 6.

6

CHECK HARNESS CONNECTOR BETWEEN 
BODY INTEGRATED MODULE AND STOP 
LIGHT SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from stop light 
switch.
3) Measure the resistance of harness 
between body integrated module and stop light 
switch.

Connector & terminal

LHD model (With cruise control)

(B281) No. 23 — (B65) No. 3:

LHD model (Without cruise control)

(B281) No. 23 — (B64) No. 2:

RHD model

(B281) No. 23 — (B64) No. 2:

Is the resistance less than 1 
Ω?

Go to step 7.

Repair the open 
circuit of harness 
between body inte-
grated module and 
stop light switch.

Step

Check

Yes

No

4AT(diag)-52

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

7

CHECK HARNESS CONNECTOR BETWEEN 
BODY INTEGRATED MODULE AND STOP 
LIGHT SWITCH.
Measure the resistance of harness between 
body integrated module and stop light switch.

Connector & terminal

(B281) No. 23 — Chassis ground:

Is the resistance more than 1 
M

Ω?

Go to step 8.

Repair the short 
circuit of harness 
between body inte-
grated module and 
stop light switch.

8

CHECK POOR CONTACT.

Is there poor contact in input 
signal of brake switch?

Repair the poor 
contact.

Check the body 
integrated module.

Step

Check

Yes

No