Subaru Legacy IV (2008 year). Service manual — part 928
VDC(diag)-27
Warning Light Illumination Pattern
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
C: ABS WARNING LIGHT DOES NOT COME ON
DETECTING CONDITION:
• Defective combination meter
• Defective harness
TROUBLE SYMPTOM:
When the ignition switch is turned to ON (engine OFF), ABS warning light does not illuminate.
WIRING DIAGRAM:
MAIN SBF
SBF-6
No.5
No.33
A:
i10
B:
i11
E
E
B310
28
25
32
VDCCM & H/U
A7
8
i3
B38
A3
i10
2
1
3 4
6 7 8 9 10
22
21
20
19
18
17
16
15
14
13
12
11
5
A:
*
*
i11
B:
2
1
3
4 5 6
14
13
12
11
10
9
8
7
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
VDC00657
20
9
B38
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
BATTERY
IGNITION
SWITCH
COMBINATION
METER
: NORMAL METER
METER WITH MID
BRAKE
W
ARNING
LIGHT
ABS
W
ARNING
LIGHT
: A5
: B5
REVERSE
CIRCUIT
REVERSE
CIRCUIT
VDC(diag)-28
Warning Light Illumination Pattern
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK OTHER LIGHTS TURN ON.
Turn the ignition switch to ON. (engine OFF)
Do other warning lights illumi-
nate?
Go to step 2.
Check the combi-
nation meter.
2
READ DTC.
Read the DTC. <Ref. to VDC(diag)-21, Read
Diagnostic Trouble Code (DTC).>
Is DTC displayed?
Perform the diag-
nosis according to
DTC.
Go to step 3.
3
CHECK GROUND SHORT CIRCUIT OF HAR-
NESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector (B310) from the
VDCCM&H/U.
3) Disconnect the connector (i10) or (i11) from
the combination meter.
4) Measure the resistance between
VDCCM&H/U connector and chassis ground.
Connector & terminal
(B310) No. 32 — Chassis ground:
Is the resistance 1 M
: or
more?
Go to step 4.
Repair the harness
connector between
VDCCM&H/U and
combination meter.
4
CHECK VDCCM.
1) Connect the connector (B310) to
VDCCM&H/U.
2) Turn the ignition switch to ON.
3) Measure the resistance between the combi-
nation meter connector and chassis ground
soon after the ignition switch is turned to ON
(within 2 seconds).
Connector & terminal
Normal meter model
(i10) No. 5 — Chassis ground:
Meter with MID model
(i11) No. 5 — Chassis ground:
Is the resistance 1 M
: or
more?
Check the combi-
nation meter.
Replace the
VDCCM only.
VDC(diag)-29
Warning Light Illumination Pattern
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
D: ABS WARNING LIGHT DOES NOT GO OFF
DETECTING CONDITION:
• Defective combination meter
• Open circuit of harness
TROUBLE SYMPTOM:
When starting the engine, the ABS warning light is kept ON.
WIRING DIAGRAM:
MAIN SBF
SBF-6
No.5
No.33
A:
i10
B:
i11
E
E
B310
28
25
32
VDCCM & H/U
A7
8
i3
B38
A3
i10
2
1
3 4
6 7 8 9 10
22
21
20
19
18
17
16
15
14
13
12
11
5
A:
*
*
i11
B:
2
1
3
4 5 6
14
13
12
11
10
9
8
7
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
VDC00657
20
9
B38
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
BATTERY
IGNITION
SWITCH
COMBINATION
METER
: NORMAL METER
METER WITH MID
BRAKE
W
ARNING
LIGHT
ABS
W
ARNING
LIGHT
: A5
: B5
REVERSE
CIRCUIT
REVERSE
CIRCUIT
VDC(diag)-30
Warning Light Illumination Pattern
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
E: VDC INDICATOR LIGHT DOES NOT GO OFF
DETECTING CONDITION:
• Defective combination meter
• Defective CAN communication
TROUBLE SYMPTOM:
When starting the engine, VDC indicator light is kept ON.
Step
Check
Yes
No
1
READ DTC.
Read the DTC. <Ref. to VDC(diag)-21, Read
Diagnostic Trouble Code (DTC).>
Is DTC displayed?
Perform the diag-
nosis according to
DTC.
Go to step 2.
2
CHECK WIRING HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector (B310) from the
VDCCM&H/U.
3) Disconnect the connector (i10) or (i11) from
the combination meter.
4) Measure the resistance between
VDCCM&H/U connector and combination
meter connector.
Connector & terminal
Normal meter model
(B310) No. 32 — (i10) No. 5:
Meter with MID model
(B310) No. 32 — (i11) No. 5:
Is the resistance less than 0.5
:? Go to step 3.
Repair the harness
connector between
VDCCM&H/U and
combination meter.
3
CHECK POOR CONTACT IN CONNECTOR.
Check for poor contact in all connectors.
Is there poor contact?
Repair the connec-
tor.
Go to step 4.
4
CHECK VDCCM.
1) Connect the connector (B310) to
VDCCM&H/U.
2) Turn the ignition switch to ON.
3) Measure the resistance between combina-
tion meter connector and chassis ground.
Connector & terminal
Normal meter model
(i10) No. 5 — Chassis ground:
Meter with MID model
(i11) No. 5 — Chassis ground:
Is the resistance less than 0.5
:? Check the combi-
nation meter.
Replace the
VDCCM only.
Step
Check
Yes
No
1
READ DTC.
Read the DTC. <Ref. to VDC(diag)-21, Read
Diagnostic Trouble Code (DTC).>
Is DTC displayed?
Perform the diag-
nosis according to
DTC.
Go to step 2.
2
CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. <Ref. to
LAN(diag)-27, OPERATION, Read Diagnostic
Trouble Code (DTC).>
Is there any fault in LAN sys-
tem?
Perform the diag-
nosis according to
DTC for LAN sys-
tem.
Go to step 3.
3
CHECK COMBINATION METER.
Check the combination meter.
Is combination meter OK?
Replace the
VDCCM only.
Repair the combi-
nation meter.
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