Subaru Legacy (2005 year). Manual - part 787

VDC(diag)-13

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Control Module I/O Signal

Content

Terminal 

No.

(+) — (

−)

Input/Output signal

Measured value and measuring conditions

Power supply

14 — 6

When the ignition switch is ON, 10 — 15 V.

ABS wheel speed sen-
sor

Front LH wheel

Power 
supply

41 — 6

4.5 — 16.5 V

Signal

25

5.9 — 16.8 mA: Rectangle waveform

Front RH wheel

Power 
supply

22 — 6

4.5 — 16.5 V

Signal

21

5.9 — 16.8 mA: Rectangle waveform

Rear LH wheel

Power 
supply

24 — 6

4.5 — 16.5 V

Signal

40

5.9 — 16.8 mA: Rectangle waveform

Rear RH wheel

Power 
supply

23 — 6

4.5 — 16.5 V

Signal

38

5.9 — 16.8 mA: Rectangle waveform

Yaw rate & lateral G 
sensor

Output (Lateral G sensor)

3 — 16

When the vehicle is on level, 2.35 — 2.65 V.

Power supply

30 — 16

When the ignition switch is ON, 8 — 16 V.

Output (Yaw rate sensor)

28 — 16

WAVEFORM <Ref. to VDC(diag)-15, WAVEFORM, 

MEASUREMENT, Control Module I/O Signal.>

Specification (Yaw rate sensor)

1 — 16

2.1 — 2.9 V

Test

2 — 16

5 — 1 V cycle for 40 ms pulse signal. <Ref. to 

VDC(diag)-15, WAVEFORM, MEASUREMENT, Control 

Module I/O Signal.>

Ground

16

—

CAN Communication Line (+)

13

2.5 — 1.5 V pulse signal

CAN Communication Line (

−)

29

3.5 — 2.5 V pulse signal

Valve relay power supply

5 — 6

When the ignition switch is ON, 10 — 15 V.

Motor relay power supply

9 — 10

When the ignition switch is ON, 10 — 15 V.

Pressure sensor

Power supply

27 — 12

When the ignition switch is ON, 4.75 — 5.25 V.

Output voltage

11 — 12

0.48 — 0.72 V (when releasing the brake pedal)

Ground

12

—

ABS warning light

35 — 6

After turning the ignition switch to ON, 10 — 15 V during 

1.5 seconds and less than 1.5 V after 1.5 seconds 

passed.

Brake warning light (EBD warning light)

20 — 6

After turning the ignition switch to ON, 10 — 15 V during 

1.5 seconds and less than 1.5 V after 1.5 seconds 

passed.

Stop light switch

37 — 6

Less than 1.5 V when the stop light is OFF; otherwise, 

10 — 15 V when the stop light is ON.

Subaru Select Monitor

26 — 6

0 

←→ 12 V pulse (in communication)

Vehicle speed output signal

36

0 

←→ 12 V pulse

Ground

6

—

VDC(diag)-14

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Control Module I/O Signal

B: WIRING DIAGRAM

(1)

Battery

(15)

Rear outlet solenoid valve RH

(29)

Stop light switch

(2)

Ignition switch

(16)

Primary cut solenoid valve

(30)

Stop light

(3)

VDC control module & hydraulic 
control unit (VDCCM&H/U)

(17)

Primary suction solenoid valve

(31)

Body integrated module

(18)

Secondary cut solenoid valve

(32)

Engine control module (ECM)

(4)

VDC control module

(19)

Secondary suction solenoid valve

(33)

Transmission control module 
(TCM)

(5)

Valve Relay

(20)

Data link connector

(6)

Motor relay

(21)

VDC OFF switch

(34)

Steering angle sensor

(7)

Motor

(22)

Combination meter

(35)

Yaw rate & lateral G sensor

(8)

Front inlet solenoid valve LH

(23)

VDC indicator light

(36)

Pressure sensor

(9)

Front outlet solenoid valve LH

(24)

VDC warning light and VDC OFF 
indicator light

(37)

Front ABS wheel speed sensor LH

(10)

Front inlet solenoid valve RH

(38)

Front ABS wheel speed sensor 
RH

(11)

Front outlet solenoid valve RH

(25)

ABS warning light

(12)

Rear inlet solenoid valve LH

(26)

Brake warning light

(39)

Rear ABS wheel speed sensor LH

(13)

Rear outlet solenoid valve LH

(27)

Parking brake switch

(40)

Rear ABS wheel speed sensor 
RH

(14)

Rear inlet solenoid valve RH

(28)

Brake fluid level switch

VDC00296

(3)

(7)

(6)

(5)

(11)

M

(12)

(13)

(20)

(2)

(24)

(23)

(22)

(4)

(28)

(1)

(29)

(30)

(37)

(36)

(14)

(8)

(9)

(10)

(15)

(16)

(17)

(18)

(21)

(33)

(32)

(31)

(34)

(35)

(38)

(39)

(40)

(27)

(26)

(25)

(19)

VDC(diag)-15

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Control Module I/O Signal

C: MEASUREMENT

Measure input and output signal voltage.

1. WAVEFORM

(1)

Yaw rate sensor

(2)

Terminal No.

(3)

Vehicle is at a standstill.

VDC00212

 28 – 16

20 ms

(V)

3

2

1

0

5.0 V

2.1 – 2.9 V

0

5

10

(1)

(2)

  2 – 16

(2)

(3)

VDC(diag)-16

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Subaru Select Monitor

6. Subaru Select Monitor

A: OPERATION

CAUTION:
When the Subaru Select Monitor is communi-
cating (except when displaying the data), the 
ABS warning light flashes and VDC warning 
light illuminates in the combination meter. Do 
not communicate with the Subaru Select Moni-
tor while driving, because the ABS and VDC 
functions are disabled. Carefully drive the vehi-
cle, when you have to communicate with the 
Subaru Select Monitor. When the data is dis-
played by the {Current Data Display & Save} 
menu, both the ABS and VDC warning lights are 
turned off and ABS and VDC functions are en-
abled.

1. READ DIAGNOSTIC TROUBLE CODE 
(DTC)

1) Prepare the Subaru Select Monitor kit. <Ref. to
VDC(diag)-9, SPECIAL TOOL, PREPARATION
TOOL, General Description.>

2) Connect the diagnosis cable to Subaru Select
Monitor.
3) Insert the cartridge to Subaru Select Monitor.
<Ref. to VDC(diag)-9, SPECIAL TOOL, PREPA-
RATION TOOL, General Description.>

4) Connect the Subaru Select Monitor to data link
connector.

(1) Data link connector is located in the lower
portion of instrument panel (on the driver’s side).

(2) Connect the diagnosis cable to data link
connector.

CAUTION:
Do not connect the scan tools except Subaru 
Select Monitor.
5) Turn the ignition switch to ON (engine OFF), and
the Subaru Select Monitor power switch to ON.

6) On the «Main Menu» display screen, select the
{Each System Check} and press the [YES] key.
7) On the «System Selection Menu» display
screen, select the {Brake Control} and press the
[YES] key.
8) Press the [YES] key after the {VDC} is displayed.
9) On the «VDC Diagnosis» display screen, select
the {Diagnostic Code(s) Display}, and then press
the [YES] key.

NOTE:
• For details concerning operation procedure, re-
fer to the SUBARU SELECT MONITOR OPERA-
TION MANUAL.
• For details concerning DTCs, refer to the “List of
Diagnostic Trouble Code (DTC)”. <Ref. to VDC(di-
ag)-38, List of Diagnostic Trouble Code (DTC).>
• DTCs are displayed up to three in detected or-
der.
• If a particular DTC is not properly stored in mem-
ory (due to a drop in VDCCM&H/U power supply,

ABS00111

ABS00112

(1) Data link connector

(1) Power switch

ABS00465

(1)

ABS00114

(1)