Toyota 2005 Prius Owner's Manual page 141

The slip indicator light comes on when the
"IG−ON" mode is enabled and will go off
after the "READY" light comes on. If the
indicator light does not come on when the
ignition is turned on, contact your Toyota
dealer.
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"VSC" warning light
This light warns that there is a problem
somewhere in the vehicle stability control
system.
The light will come on when the "IG−ON"
mode is enabled and will go off after the
"READY" light comes on.
If the light comes on while driving, the
system does not work. However, because
the conventional braking still operates, you
can drive your vehicle without damaging
it. Contact your Toyota dealer.
In the following cases, contact your Toyota
dealer:
D
The warning light does not come on
after the "IG−ON" mode is enabled.
D
The warning light remains on after the
"READY" light comes on.
D
The warning light comes on while driv-
ing.
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