Subaru Legacy 2004 Service Manual page 3106

F: VDC WARNING LIGHT AND VDC OFF INDICATOR LIGHT DO NOT GO OFF
DETECTING CONDITION:
• Defective combination meter
• Defective CAN communication
• Defective engine
• VDC OFF switch is shorted.
TROUBLE SYMPTOM:
When starting the engine, VDC OFF indicator light is kept ON.
NOTE:
When pressing the VDC OFF switch for more than 10 seconds, the VDC OFF indicator light goes off and can-
not operate any more. When turning the ignition switch from OFF to ON, the OFF operation enabled status
is restored.
Step
1 READ DTC.
Read the DTC. <Ref. to VDC(diag)-22, Read
Diagnostic Trouble Code (DTC).>
2 CHECK ENGINE.
3 CHECK ENGINE COOLANT.
Warm up the engine and check if VDC warning
light and VDC OFF indicator light illumination
condition changes.
4 CHECK VDC OFF SWITCH.
Remove and check VDC OFF switch.
5 CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. <Ref. to
LAN(diag)-24, OPERATION, Read Diagnostic
Trouble Code (DTC).>
6 CHECK COMBINATION METER.
Check the combination meter.
Warning Light Illumination Pattern
Is DTC displayed?
Does the malfunction indicator
light illuminate?
When the engine coolant tem-
perature is too low, VDC warn-
ing light and VDC OFF
indicator light illuminate. Does
the lights go off when the
engine is warmed-up?
Is VDC OFF switch normal?
Is there any fault in LAN sys-
tem?
Is combination meter OK?
VDC(diag)-33
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Check
Perform the diag-
nosis according to
DTC.
Repair the engine. Go to step 3.
Normal Operation Go to step 4.
Go to step 5.
Perform the diag-
nosis according to
DTC for LAN sys-
tem.
Replace the
VDCCM&H/U.
Yes No
Go to step 2.
Replace the VDC
OFF switch.
Go to step 6.
Repair the combi-
nation meter.