Subaru 2001 Legacy Owner's Manual page 293

D The VDC warning light will also turn on when a problem occurs
with the ABS or VDC electronic control systems.
Because the VDC system controls each brake through the ABS,
whenever the ABS stops operating due to a malfunction in that electri-
cal system, the VDC will also become unable to control all four
brakes. Thus VDC system operation halts and the VDC warning light
turns on. Although both the VDC system and the ABS will be inoper-
able in this situation, it will still be possible to stop the vehicle using
normal braking. The VDC system and the ABS do not adversely affect
operation of the vehicle in any way when they are inoperable; how-
ever should such a situation occur, drive with care and have an autho-
rized SUBARU dealer carry out an inspection of those systems at the
first available opportunity.
NOTE
When the VDC warning light turns on and off in the following way,
it indicates that the VDC system is operating normally.
D Although turning on after the engine has been started, the
warning light quickly turns off and stays off.
D The warning light turns on after the engine is started and does
not turn off until the vehicle reaches a speed of 8 mph (12 km/h).
D The warning light turns on when the vehicle is being driven; it
then turns off and stays off.
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