Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 536
VDC(diag)-43
Warning Light Illumination Pattern
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
WIRING DIAGRAM:
Vehicle Dynamics Control System <Ref. to WI-67, Vehicle Dynamics Control System.>
Step
Check
Yes
No
1
READ DTC.
Read the DTC. <Ref. to VDC(diag)-25, Read
Diagnostic Trouble Code (DTC).>
Is DTC displayed?
2
CHECK HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the
VDCCM&H/U and VDC OFF switch.
3) Measure the resistance of harness between
the VDCCM&H/U and VDC OFF switch con-
nectors.
Connector & terminal
(B310) No. 31 — (B318) No. 2:
Is the resistance less than 1 Ω? Go to step
Repair the harness
between the
VDCCM&H/U and
VDC OFF switch
connectors.
B318
1 2 3 4
32
B318
VDC00994
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
31
B310
E
VDCCM & H/U
VDC OFF
SWITCH
VDC(diag)-44
Warning Light Illumination Pattern
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
3
CHECK GROUND SHORT OF HARNESS.
Measure the resistance between VDCCM&H/U
connector and chassis ground.
Connector & terminal
(B310) No. 31 — Chassis ground:
Is the resistance 1 MΩ or
more?
Repair the harness
between the
VDCCM&H/U and
VDC OFF switch
connectors.
4
CHECK HARNESS.
Measure the resistance of harness between
VDC OFF switch connector and chassis
ground.
Connector & terminal
(B318) No. 3 — Chassis ground:
Is the resistance less than 10
Ω?
Repair the harness
between the VDC
OFF switch con-
nector and chassis
ground.
5
CHECK VDC OFF SWITCH.
Check the VDC OFF switch. <Ref. to VDC-29,
INSPECTION, VDC OFF Switch.>
Is the VDC OFF switch normal? Go to step
Replace the VDC
OFF switch. <Ref.
to VDC-29, VDC
OFF Switch.>
6
CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. <Ref. to
LAN(diag)-2, Basic Diagnostic Procedure.>
Is there any fault in LAN sys-
tem?
7
CHECK COMBINATION METER.
Check the combination meter. <Ref. to IDI-5,
INSPECTION, Combination Meter System.>
Is combination meter OK?
Replace the com-
bination meter.
<Ref. to IDI-16,
Combination
Meter.>
Step
Check
Yes
No
VDC(diag)-45
Warning Light Illumination Pattern
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
2. HILL START ASSIST ON/OFF MODE
DETECTING CONDITION
• Defective combination meter
• Defective CAN communication
• Defective VDC OFF switch
TROUBLE SYMPTOM:
Hill start assist warning light does not illuminate or go off when hill start assist function ON/OFF is changed.
(Hill start assist mode does not change.)
NOTE:
• When the VDC OFF switch is kept pressed, the VDC traction mode indicator light illuminates in green at
first, then turns yellow, and then goes off in approx. 8 seconds. If the switch is released in 5 seconds after the
light goes off then pressed again in 2 seconds, hill start assist warning light illuminates then mode is changed
to hill start assist OFF mode.
• Hill start assist warning light always illuminates to inform that the hill start assist does not operate during
hill start assist OFF mode.
• When the VDC OFF switch is held down for 10 seconds or more and the VDC traction mode indicator light
goes off, if the switch is not pressed again within 5 seconds, subsequent switch operations will not be ac-
cepted. When turning the ignition switch from OFF to ON, the operation enabled status is restored.
VDC(diag)-46
Warning Light Illumination Pattern
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
WIRING DIAGRAM:
Vehicle Dynamics Control System <Ref. to WI-67, Vehicle Dynamics Control System.>
Step
Check
Yes
No
1
READ DTC.
Read the DTC. <Ref. to VDC(diag)-25, Read
Diagnostic Trouble Code (DTC).>
Is DTC displayed?
2
CHECK HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the
VDCCM&H/U and VDC OFF switch.
3) Measure the resistance of harness between
the VDCCM&H/U and VDC OFF switch con-
nectors.
Connector & terminal
(B310) No. 31 — (B318) No. 2:
Is the resistance less than 1 Ω? Go to step
Repair the harness
between the
VDCCM&H/U and
VDC OFF switch
connectors.
B318
1 2 3 4
32
B318
VDC00994
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
31
B310
E
VDCCM & H/U
VDC OFF
SWITCH
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