Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 525
VDC-29
VDC OFF Switch
VEHICLE DYNAMICS CONTROL (VDC)
12.VDC OFF Switch
A: REMOVAL
1) Remove the instrument panel lower cover. <Ref.
to EI-49, REMOVAL, Instrument Panel Lower Cov-
2) Remove the screws, and then remove the VDC
OFF switch.
B: INSTALLATION
Install each part in the reverse order of removal.
C: INSPECTION
1) Check the resistance between the VDC OFF
switch terminals.
2) Replace the VDC OFF switch if the inspection
result is not within the standard value.
Switch position
Terminal No.
Standard
OFF
2 — 3
1 MΩ or more
ON
2 — 3
Less than 1 Ω
VDC00541
4 3 2 1
VDC-30
VDC OFF Switch
VEHICLE DYNAMICS CONTROL (VDC)
VEHICLE DYNAMICS CONTROL (VDC) (DI-
AGNOSTICS)
VDC(diag)
Page
Basic Diagnostic Procedure . . . . . . . . . . . . . . . . . ...2
Check List for Interview . . . . . . . . . . . . . . . . . . . ..4
General Description . . . . . . . . . . . . . . . . . . . . .10
Electrical Component Location . . . . . . . . . . . . . . . . 12
Control Module I/O Signal . . . . . . . . . . . . . . . . . . 14
Subaru Select Monitor . . . . . . . . . . . . . . . . . . . ..18
Read Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . .25
Inspection Mode . . . . . . . . . . . . . . . . . . . . . ...26
Clear Memory Mode . . . . . . . . . . . . . . . . . . . . .27
Warning Light Illumination Pattern . . . . . . . . . . . . . . ...28
List of Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . 48
Diagnostic Procedure with Diagnostic Trouble Code (DTC) . . . . . 53
General Diagnostic Table . . . . . . . . . . . . . . . . . ...110
VDC(diag)-2
Basic Diagnostic Procedure
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
1. Basic Diagnostic Procedure
A: PROCEDURE
CAUTION:
Remove foreign matter (dust, water, oil etc.) from the VDCCM&H/U connector during removal and in-
stallation.
NOTE:
• To check the harness for open or short circuits, shake problem spot or connector.
• Refer to “Check List for Interview”. <Ref. to VDC(diag)-4, Check List for Interview.>
Step
Check
Yes
No
1
Is the component that might
influence the VDC problem nor-
mal?
Repair or replace
each component.
2
CHECK INDICATION OF DTC.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor to data
link connector.
3) Turn the ignition switch to ON and run the
Subaru Select Monitor.
4) Read the DTC using the Subaru Select
Monitor. <Ref. to VDC(diag)-25, OPERATION,
Read Diagnostic Trouble Code (DTC).>
NOTE:
Is DTC displayed on Subaru
Select Monitor?
3
PERFORM GENERAL DIAGNOSTICS.
1) Perform the inspection by referring to “Gen-
eral Diagnostic Table”. <Ref. to VDC(diag)-110,
INSPECTION, General Diagnostic Table.>
2) Perform the Clear Memory Mode. <Ref. to
VDC(diag)-27, OPERATION, Clear Memory
Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-26, PROCEDURE, Inspection
Mode.>
4) Read the DTC. <Ref. to VDC(diag)-25,
OPERATION, Read Diagnostic Trouble Code
(DTC).>
5) Check the DTC is not displayed.
Do the VDC warning light and
ABS warning light go off after
starting the engine?
Finish the diagno-
sis.
4
CHECK FREEZE FRAME DATA.
Using the Subaru Select Monitor, check the
freeze frame data of the VDC control module.
Are freeze frame data
recorded?
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