Toyota Lexusc Owner's Handbook Manual page 521

STARTING AND DRIVING
"VSC" warning light
This light warns that there is a problem somewhere in the
vehicle stability control system or traction control system.
The light will come on when the ignition key is turned to "ON"
and will go off after a few seconds.
If the light comes on while driving, the vehicle stability control
system and traction control system do not work. However, as
conventional braking operates when applied, there is no
problem to continue your driving.
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In the following cases, contact your Lexus dealer:
D The warning light does not come on after the ignition key is
turned to "ON".
D The warning light remains on after the ignition key is turned
to "ON".
D The warning light comes on while driving.
The "TRAC OFF" indicator light will come on when the "VSC"
warning light comes on even if the "TRAC OFF" switch is not
pushed.