Subaru 2009 IMPREZA Service Manual page 2561

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. <Ref. to
LAN(diag)-31, OPERATION, Read Diagnostic
Trouble Code (DTC).>
2 CHECK REVERSE SIGNAL USING SUBARU
SELECT MONITOR.
1) Select {Current Data Display & Save} in
Subaru Select Monitor.
2) Read the indication of reverse signal.
3 CHECK BACK-UP LIGHT ILLUMINATION.
1) Turn the ignition switch to ON.
2) Place the shift lever in reverse position.
4 CHECK HARNESS BETWEEN BODY INTE-
GRATED UNIT AND BACK-UP LIGHT
SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from body inte-
grated unit and back-up light switch.
3) Measure the resistance of harness between
body integrated unit and back-up light switch
connector.
Connector & terminal
Non-turbo model
(B280) No. 18 — (B24) No. 1:
Turbo model
(B280) No. 18 — (T13) No. 2:
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 there any fault in LAN sys-
tem?
Is OFF displayed when the shift
lever is placed in any position
other than reverse, and is ON
displayed in reverse position?
Does the back-up light illumi-
nate?
Is the resistance less than 0.5 ? Replace the back-
Is the same DTC displayed?
Is any other DTC displayed?
VDC(diag)-99
Yes No
Perform the diag- Go to step 2.
nosis according to
DTC for LAN sys-
tem.
Go to step 5. Go to step 3.
Go to step 4. Repair the back-up
light circuit.
Repair the harness
up light switch. between body inte-
<Ref. to 5MT-33, grated unit and
Switches and Har- back-up light
ness.> switch connector.
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).>