Lexus SC 430 2004 Manual page 232

You may hear a sound in the engine compartment for a few
seconds when the engine is started or just after the vehicle
begins to move. This means that the vehicle stability control
is in the self-check mode and does not indicate a malfunction.
31sa17b
You can turn off the vehicle stability control system by
pushing the "VSC OFF" switch. The "VSC OFF" indicator
comes on. At this time, the traction control system also
turns off. You cannot turn off either one of them. Pushing
the "VSC OFF" switch a second time turns the system
back on and extinguishes the "VSC OFF" indicator light.
When you turn the ignition switch on, this system always turns
on.
STARTING AND DRIVING
Vehicle stability control system failure
warning
31sa18a
These lights warn when there is a problem somewhere in the
vehicle stability control system or traction control system.
If the "VSC" warning light and "VSC OFF" indicator light come
on, have your vehicle checked by Lexus dealer as soon as
possible.
The lights will come on when the ignition switch is turned to
"ON", and will go off after about a few seconds.
The lights may stay on for 60 seconds after the ignition switch
is turned to the "ON" position. It is normal if they go out after
a while.
Depressing the brake pedal repeatedly may turn on the lights.
It is normal if they go out after a few seconds.
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