Toyota Lexus IS300 Manual page 265

STARTING AND DRIVING
"ABS" warning light
SV31014
" U.S.A.
SV31031
" CANADA
252
The light comes on when the ignition key is turned to the "ON"
position. If the anti–lock brake system and the brake assist
work properly, the light turns off after a few seconds.
Thereafter, if either of the systems malfunctions, the light
comes on again.
When the "ABS" warning light is on (and the brake system
warning light is off), the anti–lock brake system, the brake
assist system, the traction control system and/or the vehicle
skid control system do not operate, but the brake system still
operates conventionally.
When the "ABS" warning light is on (and the brake system
warning light is off), the anti–lock brake system and/or the
traction control system do/does not operate so that the wheels
could lock up during a sudden braking or braking on slippery
road surfaces.
If either of the following conditions occurs, this indicates
a malfunction somewhere in the parts monitored by the
warning light system. Contact your Lexus dealer as soon
as possible to service the vehicle.
D The light does not come on when the ignition key is turned
to the "ON" position, or remains on.
D The light comes on while you are driving.
A warning light turning on briefly during operation does not
indicate a problem.
2003 IS300 from Aug. '02 Prod. (OM53439U)