Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 544
VDC(diag)-75
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AD:DTC C0052 MOTOR AND MOTOR RELAY ON FAILURE
DTC DETECTING CONDITION:
• Defective motor relay
• Defective harness connector
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
• EBD may not operate.
WIRING DIAGRAM:
Vehicle Dynamics Control System <Ref. to WI-67, Vehicle Dynamics Control System.>
B310
E
23
25
VDCCM & H/U
2
8
PUMP MO
T
OR
M
FL INLET
MAIN SBF
SBF-6
No.33
E
BATTERY
IGNITION
SWITCH
SOLENOID
V
AL
VE
MO
T
OR RELA
Y
VALVE RELAY
FR INLET
RL INLET
RR INLET
FL OUTLET
FR OUTLET
RL OUTLET
RR OUTLET
P
R
IM
A
RY
C
U
T
S
E
C
O
N
D
A
RY
C
U
T
P
R
IM
A
RY
S
U
C
T
IO
N
SBF-1
E
22
S
E
C
O
N
D
A
RY
S
U
C
T
IO
N
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
VDC00467
VDC(diag)-76
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AE:DTC C0052 MOTOR MALFUNCTION
DTC DETECTING CONDITION:
• Defective motor
• Defective motor relay
• Defective harness connector
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
• EBD may not operate.
NOTE:
For the diagnostic procedure, refer to “DTC C0052 MOTOR AND MOTOR RELAY OFF FAILURE”. <Ref. to
VDC(diag)-73, DTC C0052 MOTOR AND MOTOR RELAY OFF FAILURE, Diagnostic Procedure with Diag-
Step
Check
Yes
No
1
CHECK INSTALLATION OF MOTOR
GROUND.
Is the motor ground terminal
installation bolt tightened 33
N·m (3.4 kgf-m, 24.3 ft-lb)?
Tighten the motor
ground terminal
installation bolt.
2
CHECK VDCCM&H/U MOTOR RELAY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the
VDCCM&H/U.
3) Measure the resistance between
VDCCM&H/U terminals.
Terminals
No. 23 — No. 22:
Is the resistance 1 MΩ or
more?
Replace the
VDCCM&H/U.
<Ref. to VDC-8,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
3
CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-27,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-26, Inspection Mode.>
4) Read the DTC.
Is the same DTC displayed?
4
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Temporary poor
contact occurs.
NOTE:
Though the ABS
warning light re-
mains on at this
time, this is normal.
Drive the vehicle at
12 km/h (7 MPH)
or more in order to
turn ABS warning
light off. Be sure to
drive the vehicle
and check that the
warning light goes
off.
VDC(diag)-77
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AF:DTC C0054 BLS CIRCUIT OPEN
DTC DETECTING CONDITION:
Defective stop light switch
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:
Vehicle dynamics control system <Ref. to WI-67, Vehicle Dynamics Control System.>
B225
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
22
9
15
1 2
3 4
B225
21
5Dr
4Dr
7
4Dr
4Dr
6
7
9
4
7
6
2
1
5
3
8
B65
1 2
3 4
1 2 3 4 5
B65
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
1 2
3 4 5
6 7 8 9 10 11 12
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
B310
30
B65
B434
B159
R168
B99
R3
B99
R3
B435
*
1
*
2
5Dr
5Dr
*
1
*
2
B159
R168
B99
B434
B435
5Dr
4Dr
VDC00819
VDCCM & H/U
E
:
:
SBF-2
: 4 DOOR MODEL : 4
5 DOOR MODEL : 2
: 4 DOOR MODEL : 3
5 DOOR MODEL : 1
BATTERY
No. 8
MAIN SBF
STOP LIGHT &
BRAKE SWITCH
: 4 DOOR MODEL
: 5 DOOR MODEL
FUSE & RELAY BOX
(F/B)
FUSE
(RELA
Y BLOCK)
7.5A
VDC(diag)-78
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK OUTPUT OF STOP LIGHT SWITCH
WITH SUBARU SELECT MONITOR.
1) Select “Current Data Display & Save” on the
Subaru Select Monitor. <Ref. to VDC(diag)-19,
READ CURRENT DATA, OPERATION, Subaru
Select Monitor.>
2) Release the brake pedal.
3) Read the «Brake Switch» using the Subaru
Select Monitor.
Is “OFF” displayed on the
screen?
2
CHECK OUTPUT OF STOP LIGHT SWITCH
WITH SUBARU SELECT MONITOR.
1) Depress the brake pedal.
2) Read the «Brake Switch» using the Subaru
Select Monitor.
Is “ON” displayed on the
screen?
3
CHECK IF STOP LIGHTS ILLUMINATE.
Depress the brake pedal.
Does the stop light illuminate? Go to step
Repair the stop
light circuit.
4
CHECK FUSE.
Check the fuse (B225) in the relay block.
Is the fuse OK?
Replace the fuse.
5
CHECK OPEN CIRCUIT OF HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the
VDCCM&H/U.
3) Depress the brake pedal.
4) Measure the voltage between VDCCM&H/U
connector and chassis ground.
Connector & terminal
(B310) No. 30 (+) — Chassis ground (–):
Is the voltage 10 — 15 V?
Repair the harness
between stop light
switch and
VDCCM&H/U con-
nector.
6
CHECK POOR CONTACT OF CONNEC-
TORS.
Is there poor contact of connec-
tor between stop light switch
and VDCCM&H/U?
Repair the connec-
tor.
7
CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-27,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-26, Inspection Mode.>
4) Read the DTC.
Is the same DTC displayed?
8
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Temporary poor
contact occurs.
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