Subaru Legacy IV (2008 year). Service manual — part 939
VDC(diag)-71
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AI: DTC C0054 BLS ON MALFUNCTION
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)-72
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK STOP LIGHT SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the stop light switch connector.
3) Measure the resistance of stop light switch
terminals.
Is the resistance 1 M
: or more
when switch is OFF (when
pedal is not depressed)?
Go to step 2.
Replace the stop
light switch.
2
INTERVIEWING CUSTOMERS.
Make sure that the operation was performed in
which accelerator pedal and brake pedal were
depressed simultaneously (with depressing
brake pedal with left foot).
Were the acceleration pedal
and brake pedal depressed
simultaneously?
System is normal.
(DTC may be
recorded while
brake is applied
during driving.)
Go to step 3.
3
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 4.
4
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.
VDC(diag)-73
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AJ:DTC C0054 BLS OFF MALFUNCTION
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)-74
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK STOP LIGHT SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the stop light switch connector.
3) Measure the resistance of stop light switch
terminals.
Is the resistance 0.5
: or less
when the switch is ON (when
pedal is depressed)?
Go to step 2.
Replace the stop
light switch.
2
CHECK POWER SUPPLY OF STOP LIGHT
SWITCH.
Measure the voltage between the stop light
switch terminal and chassis ground.
Connector & terminal
(B65) No. 2 (+) — Chassis ground (–):
Is the voltage 10 — 15 V?
Go to step 3.
Repair the power
supply circuit of
stop light.
3
CHECK STOP LIGHT SWITCH HARNESS.
1) Disconnect the connector from the
VDCCM&H/U.
2) Measure the resistance between
VDCCM&H/U and stop light switch.
Connector & terminal
(B65) No. 3 — (B310) No. 30:
Is the resistance less than 0.5
:? Go to step 4.
Repair the stop
light switch circuit.
4
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 5.
5
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 6.
6
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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