Subaru 2009 IMPREZA Service Manual page 2535

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 CHECK STOP LIGHT POWER SUPPLY.
Measure the voltage between stop light switch
terminal and chassis ground.
Connector & terminal
4 DOOR MODEL
(B65) No. 3 (+) — Chassis ground (–):
5 DOOR MODEL
(B65) No. 1 (+) — Chassis ground (–):
3 CHECK STOP LIGHT SWITCH HARNESS.
1) Disconnect the connector from the
VDCCM&H/U.
2) Measure the resistance between
VDCCM&H/U and stop light switch.
Connector & terminal
4 DOOR MODEL
(B65) No. 4 — (B310) No. 30:
5 DOOR MODEL
(B65) No. 2 — (B310) No. 30:
4 CHECK POOR CONTACT OF CONNEC-
TORS.
5 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.
6 CHECK OTHER DTC DETECTION.
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Check
Is the resistance 0.5 or less
when the switch is ON (when
pedal is depressed)?
Is the voltage 10 — 15 V?
Is the resistance less than 0.5 ? Go to step 4.
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)-73
Yes No
Go to step 2. Replace the stop
light switch.
Go to step 3. Repair the stop
light power supply
circuit.
Repair the stop
light switch circuit.
Repair the connec- Go to step 5.
tor.
Replace the Go to step 6.
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).>