Toyota SCION XB 2005 Owner's Manual page 128

When the "ABS" warning light is on (and the
brake system warning light is off), the anti−
lock brake system 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 oc-
curs, this indicates a malfunction some-
where in the components monitored by
the warning light system. Contact your
Scion 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" posi-
tion, or remains on.
D
The light comes on while you are driv-
ing.
A warning light turning on briefly during
operation does not indicate a problem.
122
CAUTION
If the "ABS" warning light remains on
together with the brake system warn-
ing light, immediately stop your ve-
hicle at a safe place and contact your
Scion dealer.
In this case, not only the anti−lock
brake system will fail but also the
vehicle will become extremely unsta-
ble during braking.
BRAKE ASSIST SYSTEM
When you slam the brakes on, the
brake assist system judges as an emer-
gency stop and provides more powerful
braking for a driver who cannot hold
down the brake pedal firmly.
When you slam the brakes on, more pow-
erful braking will be applied. At this time,
you may hear a sound in the engine
compartment and feel the vibrations of the
brake pedal. This does not indicate a mal-
function.
The brake assist system becomes opera-
tive after the vehicle has accelerated to a
speed in excess of approximately 10 km/h
(6 mph). It stops operating when the ve-
hicle decelerates to a speed
approximately 5 km/h (3 mph).
For an explanation of this system's warn-
ing light, see "Service reminder indicators
and warning buzzers" on page 77.
below