Lexus 2003 LS Owner's Manual page 293

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 skid control is in
the self–check mode and does not indicate a malfunction.
31L139a
You can turn off the vehicle skid 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 skid control failure warning
31L140d
If the vehicle skid control system or the traction control
system malfunctions, the master warning light and "VSC
OFF" indicator light come on. At this time the warning
message appears in the multi–information display. And
the warning tone sounds.
If the message appears, the vehicle skid control system and
traction control system do not work. Although it is no problem
to continue driving, have your vehicle checked by Lexus dealer
as soon as possible.
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