Subaru 2009 IMPREZA Service Manual page 2531

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK OUTPUT OF STOP LIGHT SWITCH
WITH SUBARU SELECT MONITOR.
1) Select {Current Data Display & Save} in
Subaru Select Monitor.
2) Release the brake pedal.
3) Read the stop light switch output in Subaru
Select Monitor.
2 CHECK OUTPUT OF STOP LIGHT SWITCH
WITH SUBARU SELECT MONITOR.
1) Depress the brake pedal.
2) Read the stop light switch output in Subaru
Select Monitor.
3 CHECK IF STOP LIGHTS ILLUMINATE.
Depress the brake pedal.
4 CHECK FUSE.
Check the fuse (B225) in the relay block.
5 CHECK OPEN CIRCUIT OF HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the
VDCCM&H/U.
3) Depress the brake pedal.
4) Measure the voltage between VDCCM&H/U
connector and chassis ground.
Connector & terminal
(B310) No. 30 (+) — Chassis ground (–):
6 CHECK POOR CONTACT OF CONNEC-
TORS.
7 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.
8 CHECK OTHER DTC DETECTION.
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Check
Is OFF displayed on the display
screen?
Is ON displayed on the display
screen?
Does the stop light illuminate? Go to step 4.
Is the fuse OK?
Is the voltage 10 — 15 V?
Is there poor contact of connec-
tor between stop light switch
and VDCCM&H/U?
Is the same DTC displayed?
Is any other DTC displayed?
VDC(diag)-69
Yes No
Go to step 2. Go to step 3.
Go to step 6. Go to step 3.
Repair the stop
light circuit.
Go to step 5. Replace the fuse.
Go to step 6. Repair the harness
between stop light
switch and
VDCCM&H/U con-
nector.
Repair the connec- Go to step 7.
tor.
Replace the Go to step 8.
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).>