Vdc Warning Light - Subaru Legacy 2003 Service Manual

VDC (DIAGNOSTICS)
11.Warning Light Illumination Pattern
A: INSPECTION
Ignition key switch
ABS warning light

VDC warning light

VDC operating
indicator light
VDC OFF
indicator light
1) When the warning and/or indicator lights do not
illuminate in accordance with this illumination pat-
tern, there must be an electrical malfunction.
2) When the warning and/or indicator lights remain
constantly OFF, repair the warning and/or indicator
lights circuit or diagnosis circuit. <Ref. to VDC-33,
ABS WARNING LIGHT, VDC WARNING LIGHT,
VDC OPERATING INDICATOR LIGHT OR VDC
OFF INDICATOR LIGHT DOES NOT COME ON.,
Diagnostics Chart with Diagnosis Connector.>
NOTE:
• Even though the ABS warning light does not go
out 1.5 seconds after it illuminates, the VDC sys-
tem operates normally when the warning light goes
out while driving at approximately 12 km/h (7
MPH). However, the Anti-lock brakes do not work
while the ABS warning light is illuminated.
• It may take a few minutes for the VDC OFF indi-
cator light to go out when the vehicle is exposed for
some time in a low temperature area. This is not a
problem because of low engine coolant tempera-
tures.
• If a vehicle wheel is stuck or free-spinning for ap-
proximately 1 minute, power transfer fluctuation to
the remaining wheels will occur. Power transfer
conditions will differ from those occurring during
WARNING LIGHT ILLUMINATION PATTERN
ON
OFF
Goes out.
Goes out.
Goes out.
Goes out.
START
Illuminates.
1.5 s
Illuminates.
Illuminates.
Illuminates.
Some seconds (Depends the water temp.)
normal vehicle operation. The ABS sensor will de-
tect this condition. The ABS and VDC warning
lights will illuminate. If the vehicle is operated with
the four wheels lifted off the ground or with the four
wheels placed on rollers, the VDCCM will detect a
problem with the speed sensor and the ABS and
VDC warning lights may illuminate. In this case,
there is no abnormality. Clear the diagnostic code
from memory.
• When the engine is started and vehicle move-
ment begins, the VDCH/U motor pump and sole-
noid valve will operate for a few seconds. This
permits checking of VDC function. Normal motor
pump and solenoid valve operational noise will be
heard. Normal brake pedal kick back will be felt
when the brake pedal is depressed. In this case,
there is no abnormality.
VDC-26
Engine runs.
ON
Goes out.
Goes out.
Goes out.
Goes out.
VDC00139