The abs and traction actuator turns off the solenoids and the ecm shuts off vsc control (traction control signal) from the skid control ecu accordingly, the result being that it is as if the abs, trc and vsc systems were not installed.
If it is impossible to control the systems, the warning light comes on to inform the driver of malfunctions in the systems (see page bc-44).
Hint:

Freeze frame data
Data list / active testSystem description
Driver seat belt warning light
When the driver seat belt is not fastened with the
ignition switch on, the driver seat belt warning light
on the combination meter comes on to inform the
driver. The center airbag sensor detects the driver
seat belt status and sends signals to the
co ...
Inside rear view mirror
The rear view mirror’s position can be adjusted to enable sufficient
confirmation of the rear view.
Adjusting the height of rear view mirror
The height of the rear view mirror can be adjusted to suit your driving
posture.
Adjust the height of the rear view
mirror by moving it up and down.
...
If you think something is
wrong
If you notice any of the following
symptoms, your
vehicle probably needs
adjustment or repair. Contact
your Toyota dealer as
soon as possible.
Visible symptoms
Fluid leaks under the vehicle
(Water dripping from the air
conditioning after use is normal.)
Flat-looking tires or uneven
tire wear
...