Subaru Legacy IV (2008 year). Service manual — part 938
VDC(diag)-67
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AF: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:
B310
E
23
25
VDCCM & H/U
28
PUMP MOTOR
M
FL INLET
MAIN SBF
SBF-6
No.33
E
BATTERY
IGNITION
SWITCH
SOLENOID VALVE
MOTOR RELAY
VALVE RELAY
FR INLET
RL INLET
RR INLET
FL OUTLET
FR OUTLET
RL OUTLET
RR OUTLET
PRIMARY CUT
SECONDARY CUT
PRIMARY SUCTION
SBF-1
E
22
SECONDARY SUCTION
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)-68
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AG: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/MOTOR RELAY OFF FAILURE”. <Ref. to
VDC(diag)-65, DTC C0052 MOTOR AND MOTOR RELAY OFF FAILURE, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
Step
Check
Yes
No
1
CHECK VDCCM&H/U MOTOR RELAY.
1) Disconnect the connector from the
VDCCM&H/U.
2) Measure the resistance between
VDCCM&H/U connector terminals.
Terminals
No. 23 — No. 22:
Is the resistance 1 M
: or
more?
Go to step 2.
Replace the
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
2
CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-23,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-22, Inspection Mode.>
4) Read the DTC.
Is the same DTC displayed?
Replace the
VDCCM only.
<Ref. to VDC-10,
REPLACEMENT,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
Go to step 3.
3
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Perform the diag-
nosis according to
DTC. <Ref. to
VDC(diag)-34, List
of Diagnostic Trou-
ble Code (DTC).>
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)-69
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AH:DTC C0054 BLS CIRCUIT OPEN
DTC DETECTING CONDITION:
Defective stop light switch
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:
1 2
3 4
9
4
7
6
2
1
5
3
8
B65
B159
B310
30
VDCCM & H/U
59
B159
B225
B65
3
2
E
MAIN SBF
SBF-2
No.8
7.5A
3
4
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
VDC00502
B225
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
BATTERY
STOP LIGHT
SWITCH
FUSE
(RELAY BLOCK)
VDC(diag)-70
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} in the
Subaru Select Monitor.
2) Release the brake pedal.
3) Read the stop light switch output in Subaru
Select Monitor.
Is OFF displayed on the display
screen?
Go to step 2.
Go to step 3.
2
CHECK OUTPUT OF STOP LIGHT SWITCH
WITH SUBARU SELECT MONITOR.
1) Depress the brake pedal.
2) Read the stop light switch output in Subaru
Select Monitor.
Is ON displayed on the display
screen?
Go to step 6.
Go to step 3.
3
CHECK IF STOP LIGHTS ILLUMINATE.
Depress the brake pedal.
Does the stop light illuminate?
Go to step 4.
Repair the stop
light circuit.
4
CHECK FUSE.
Check the fuse (B225) in the relay block.
Is the fuse OK?
Go to step 5.
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?
Go to step 6.
Repair the harness
between stop light
switch and
VDCCM&H/U con-
nector.
6
CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in connec-
tor between stop light switch
and VDCCM&H/U?
Repair the connec-
tor.
Go to step 7.
7
CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-23,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-22, Inspection Mode.>
4) Read the DTC.
Is the same DTC displayed?
Replace the
VDCCM only.
<Ref. to VDC-10,
REPLACEMENT,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
Go to step 8.
8
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Perform the diag-
nosis according to
DTC. <Ref. to
VDC(diag)-34, List
of Diagnostic Trou-
ble Code (DTC).>
Temporary poor
contact occurs.
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