Lexus RX300 2003 Owner's Manual page 227

In the following cases, contact your Lexus dealer:
D The indicator light does not come on when the ignition key
is turned to "ON".
D The indicator light remains on after the ignition is turned on.
D The indicator light comes on with the normal driving mode
while driving.
"VSC" warning light
31R055
This light warns that there is a problem somewhere in the
vehicle skid 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 skid control
system and traction control system do not work. However, as
conventional braking operates when applied, there is no
problem to continue your driving.
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.