Subaru 2009 IMPREZA Service Manual page 2533

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
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.
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).
3 CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-24,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-23, Inspection Mode.>
4) Read the DTC.
4 CHECK OTHER DTC DETECTION.
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Check
Is the resistance 1 M or more
when switch is OFF (when
pedal is not depressed)?
Were the acceleration pedal
and brake pedal depressed
simultaneously?
Is the same DTC displayed?
Is any other DTC displayed?
VDC(diag)-71
Yes No
Go to step 2. Replace the stop
light switch.
System is normal. Go to step 3.
(DTC may be
recorded while
brake is applied
during driving.)
Replace the Go to step 4.
VDCCM only.
<Ref. to VDC-9,
REPLACEMENT,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
Perform the diag- Temporary poor
nosis according to contact occurs.
DTC. <Ref. to
VDC(diag)-33, List
of Diagnostic Trou-
ble Code (DTC).>