Subaru Legacy III (2000-2003 year). Manual - part 735

VDC-8

VDC

VDC CONTROL MODULE (VDCCM)

2. VDC Control Module (VDC-

CM)

A: REMOVAL

1) Disconnect battery ground cable.

2) Remove lower cover of instrument panel and
disconnect connectors on the back side of the cov-
er.

3) Remove three bolts which secure the fuse box
onto body side, then move the fuse box aside.
LHD model

RHD model

4) Remove two bolts which install VDCCM onto
body side bracket.
LHD model

RHD model

5) Disconnect connector from VDCCM by pulling
up the securing holder.

6) Remove VDCCM.

FU-00009

VDC00074

VDC00075

VDC00159

VDC00076

VDC00160

VDC00077

VDC-9

VDC

VDC CONTROL MODULE (VDCCM)

B: INSTALLATION

Install in the reverse order of removal.

CAUTION:
After completion of installation procedure, the 
following two position settings must be made.
• Steering angle sensor center positioning
• Yaw rate and lateral G sensor 0 positioning
These procedures are necessary for VDCCM to
later recognize what position the vehicle is in.
For procedures for the above two settings,
<Ref. to VDC-9, ADJUSTMENT, VDC Control
Module (VDCCM).>.

C: INSPECTION

Check the VDCCM identification mark.

D: ADJUSTMENT

Always conduct steering angle sensor center posi-
tioning and yaw rate and lateral G sensor 0 posi-
tioning whenever you have replaced, removed or
installed the following items.
• VDCCM
• Combination base switch assembly (Steering
angle sensor)
• Yaw rate and lateral G sensor 
• Steering wheel parts (including airbag)
• Suspension parts
• Adjustment of wheel alignment

1. WITHOUT SUBARU SELECT MONITOR

1) Park the vehicle in a straight ahead position on a
horizontal surface.
2) Confirm the steering wheel center position. (If
the center position is not accurate, adjust wheel
alignment.)
3) Drive the vehicle approx. 10 km (6 MPH) prefer-
ably on a straight road, then turn ignition switch
OFF. Then drive the vehicle approx. 10 km (6
MPH) again confirming that ABS and VDC warning
lights do not go ON while vehicle is being driven.
Also make sure there are no abnormalities of the
VDC function or steering operation.

NOTE:
If it is not possible to drive the vehicle, use SUBA-
RU SELECT MONITOR.
<Ref. to VDC-9, WITH SUBARU SELECT MONI-
TOR, ADJUSTMENT, VDC Control Module (VDC-
CM).>
4) If there are any abnormalities found, conduct the
procedure over again.

2. WITH SUBARU SELECT MONITOR

1) Park the vehicle in a straight ahead position on a
horizontal surface. (Engine running in gear position
of P or N)
2) Confirm the steering wheel center position. (If
the center position is not accurate, adjust wheel
alignment.)
3) Set the SUBARU SELECT MONITOR on the ve-
hicle and select “Set Mode Str.A.Sen.N & Lat.Gs-
en.0p” in “Function Check Sequence” display
menu. (Follow the instructions in the display.)
4) Select “Current Data display & Save” in {Brake
Control System} display menu and confirm if the
steering angle sensor is indicated as “0 deg”.
5) If the display does not indicate {0 deg}, conduct
the procedure over again and make sure it indi-
cates “0 deg”.
6) Drive the vehicle approx. 10 minutes and con-
firm that ABS and VDC warning lights do not go ON
while vehicle is being driven.
7) If there are any abnormalities in VDC function or
steering operation found while vehicle is being driv-
en, conduct the procedure over again.

(1) Specification mark

Vehicle specifications

VDCCM identi-

fication mark

Except Austra-
lia spec.

Except OUTBACK

K

OUTBACK

Except 3.0 
L model

M

3.0 L model

N

Australia spec.

Except OUTBACK

J

OUTBACK

Y

VDC00161

2 7 5 2 6 A E 1 7 0

BOSCH BRAKING SYSTEMS Co.,Ltd.

( 1 )

VDC-10

VDC

HYDRAULIC CONTROL UNIT (H/U)

3. Hydraulic Control Unit (H/U)

A: REMOVAL

1. HYDRAULIC UNIT (H/U)

1) Disconnect ground cable from battery.

2) Remove air intake duct from engine compart-
ment to facilitate removal of hydraulic unit.
3) Disconnect connector from hydraulic unit.

CAUTION:
Be careful not to let water or other foreign mat-
ter contact the H/U terminal.
4) Unlock cable clip.
5) Disconnect brake pipes from hydraulic unit.

CAUTION:
Wrap brake pipes with vinyl bag to avoid spill-
ing brake fluid on vehicle body.
6) Remove nuts and bolt which secure hydraulic
unit bracket, and remove hydraulic unit from engine
compartment.

CAUTION:
• Hydraulic unit cannot be disassembled. Do
not attempt to loosen bolts and nuts.
• Do not drop or bump hydraulic unit.
• Do not turn the hydraulic unit upside down or
place it on its side.
• Be careful to prevent foreign particles from
getting into hydraulic unit.
• When a new hydraulic unit is installed, apply
a coat of rust-preventive wax (Nippeco LT or
GB) to bracket attaching bolt after tightening.
• Do not pull harness disconnecting harness
connector.

2. RELAY BOX

1) Disconnect ground cable from battery.
2) Remove air intake duct from engine compart-
ment to facilitate removal of relay box.
3) Disconnect connector from relay box.
4) Unlock cable clip.
5) Remove nuts which secure relay box, and re-
move relay box and connector bracket.

CAUTION:
Do not drop or bump relay box.

FU-00009

VDC00079

VDC00080

VDC-11

VDC

HYDRAULIC CONTROL UNIT (H/U)

B: INSTALLATION

1. HYDRAULIC UNIT (H/U)

1) Install hydraulic unit.

Tightening torque:

18 N·m (1.8 kgf-m, 13.0 ft-lb)

2) Connect hydraulic unit ground cable to body.

Tightening torque:

33 N·m (3.4 kgf-m, 25 ft-lb)

3) Connect brake pipes to their correct hydraulic
unit connections.
4) Secure hydraulic unit connector to connector
bracket.

CAUTION:
Align connector with mating receptacle.
5) Connect connector to hydraulic unit.

6) Install air intake duct.
7) Connect ground cable to battery.
8) Bleed air from the brake system.

2. RELAY BOX

1) Install relay box and connector bracket.

Tightening torque:

13 N·m (1.3 kgf-m, 9.4 ft-lb)

2) Secure relay box connector to connector brack-
et.

CAUTION:
Align connector with mating receptacle.
3) Connect connector to relay box.

4) Install air intake duct.
5) Connect ground cable to battery.

(1) Relay box connector

(2) Hydraulic unit connector

VDC00079

VDC00081

( 1 )

( 2 )

(1) Relay box connector

(2) Hydraulic unit connector

VDC00080

VDC00081

( 1 )

( 2 )