Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 535

VDC(diag)-39

Warning Light Illumination Pattern

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

K: BRAKE WARNING LIGHT DOES NOT GO OFF

DETECTING CONDITION:

• Brake warning light circuit is shorted.

• Defective sensor/connector

• Defective CAN communication

TROUBLE SYMPTOM:

After starting the engine, the brake warning light remains lit though the parking lever is released.

VDC(diag)-40

Warning Light Illumination Pattern

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

WIRING DIAGRAM:

Parking brake / brake fluid level warning light system <Ref. to WI-151, Parking Brake / Brake Fluid Level

Warning Light System.>

5

2

46

45

44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

15

14

13

12

11

i77

1 2 3 4 5 6 7 8 9 10

i77

*

2

*

2

*

1

*

1

*

2

*

1

3

3

B438

B437

1 2 3 4 5

R3

R4

B437

B438

B99

10

B99

1 2

3 4 5

6 7 8 9 10 11 12

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

C: B281

5 6 7

8

2

1

9

4

3

10

24

22 23

25

11 12 13 14 15

26

27 28

16 17 18 19

20 21

B: B280

1 2 3

4 5 6

7 8 9 10 11 12 13 14 15 16 17

18 19 20

21 22 23 24

25 26

A:

i84

1 2

3 4

5 6

7 8

9 10 11 12

14 15 16 17 18 19 20 21 22 23

24 25

26 27 28 29

30 31 32 33

34 35

13

1
2

C: B281

B: B280

A:

i84

2

1

24

8

26

27

C15

A9

A1

B9

B3

i10

i3

B16

B38

B310

10

35

i10

9

8

7

6

5

4

3

2

1

27 28

26

21 22

20

24 25

23

18 19

17

12 13

14 15

11

16

5 6 7 8 9 10

4

3

2

1

B16

i3

B310

VDC01085

E

SBF-6

I/F

MAIN SBF

No.

5

BODY INTEGRATED UNIT

BATTERY

COMBINATION

METER

MICRO COMPUTER

CAN TRANSCEIVER &

RECEIVER

BRAKE FLUID

LEVEL SWITCH

PARKING BRAKE/

BRAKE FLUID LEVEL

W

ARNING LIGHT

IGNITION

SWITCH

PARKING

BRAKE

SWITCH

: TERMINAL No. OPTIONAL

ARRANGEMENT AMONG 1, 2, 3, 4 AND 5

: TERMINAL No. OPTIONAL

ARRANGEMENT AMONG 6, 7, 8, 9 AND 10

VDCCM & H/U

VDC(diag)-41

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)-25, Read
Diagnostic Trouble Code (DTC).>

Is DTC displayed?

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

Go to step

3.

3

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

Does the level of the brake fluid
amount fall 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 MΩ or
more?

Go to step

5.

Replace the mas-
ter cylinder. <Ref.
to BR-33, Master
Cylinder.>

5

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

Connector & terminal

(i10) No. 8 — Chassis ground:

Is the resistance 1 MΩ or
more?

Go to step

6.

Repair the harness
between combina-
tion meter and
brake fluid level
switch.

6

CHECK PARKING BRAKE SWITCH.
1) Disconnect the connector (R4) from parking
brake switch.
2) Release the parking brake.
3) Measure the resistance between parking
brake switch terminal and chassis ground.

Is the resistance 1 MΩ or
more?

Go to step

7.

Replace the park-
ing brake switch.

7

CHECK GROUND SHORT OF HARNESS.
1) Disconnect the connector (B281) from body
integrated unit.
2) Measure the resistance between body inte-
grated unit connector and chassis ground.

Connector & terminal

(B281) No. 15 — Chassis ground:

Is the resistance 1 MΩ or
more?

Go to step

8.

Repair the harness
between body inte-
grated unit and
parking brake
switch.

8

CHECK POOR CONTACT OF CONNECTOR.
Check for poor contact of all connectors.

Is there poor contact?

Repair the connec-
tor.

Go to step

9.

9

CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. <Ref. to
LAN(diag)-2, Basic Diagnostic Procedure.>

Is there any fault in LAN sys-
tem?

Perform the diag-
nosis according to
DTC for LAN sys-
tem. <Ref. to
LAN(diag)-32, List
of Diagnostic Trou-
ble Code (DTC).>

Go to step

10.

10

CHECK COMBINATION METER.
Check the combination meter. <Ref. to IDI-5,
INSPECTION, Combination Meter System.>

Is combination meter OK?

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

Replace the com-
bination meter.
<Ref. to IDI-16,
Combination
Meter.>

VDC(diag)-42

Warning Light Illumination Pattern

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

L: VDC MODE DOES NOT CHANGE

1. VDC TRACTION MODE

NOTE:

This diagnosis is applied to 6MT model.

DETECTING CONDITION

• Defective combination meter

• Defective CAN communication

• Defective VDC OFF switch

TROUBLE SYMPTOM:

Even when the VDC OFF switch is operated, the VDC traction mode indicator light does not illuminate, or the

illumination color does not change. (The VDC mode does not change)
NOTE:

• When the VDC OFF switch is pressed (2 seconds or less), the VDC traction mode indicator light illumi-

nates in green. (Traction mode)

• When the VDC OFF switch is held down (2 seconds or more, 10 seconds or less), the VDC OFF indicator

light illuminates in yellow. (VDC OFF mode)

• When the VDC OFF switch is pressed for 10 seconds or more, the VDC traction mode indicator light goes

off, and subsequent switch operations are not accepted. When turning the ignition switch from OFF to ON,

the OFF operation enabled status is restored.