Toyota 2006 Tundra Owner's Manual page 211

The brake actuator temperature increases
during the traction control system, vehicle
stability control system or "AUTO LSD"
system operating. If the brake actuator
temperature becomes too high while any
of the systems is operating, a buzzer will
start to sound intermittently to indicate
that the traction control system can no
longer operate. In this case, immediately
stop your vehicle at a safe place.
If the system continues to operate, the
buzzer sound changes from intermittent to
continuous. (The continuous
sounds for about 3 seconds.)
At the time, the slip indicator light will
come on and the traction control system
temporarily stops operating in order to
protect the brake actuator. (Although the
traction control system does not operate,
it is no problem to continue driving.) The
system will be automatically restored after
a short time and the slip indicator light
goes off.
200
buzzer
Without tachometer
With tachometer
'06 TUNDRA_U (L/O 0508)
"VSC TRAC" warning light
This light warns that there is a problem
somewhere in the following.
Traction control system
D
Vehicle stability control system
D
"AUTO LSD" system
D
When the system is normal and the igni-
tion key is turned to "ON", the light will
come on and will go off after a few sec-
onds.
It is not a malfunction that the warning
light may stay on for 60 seconds after the
ignition key is turned to "ON".
Depressing the brake pedal repeatedly
may turn on the light. It is normal if it
goes out after a few seconds.
If the "VSC TRAC" warning light and slip
indicator light comes on while driving, the
traction control system does not work.
However, as the brakes operate normally
when applied, it is no problem to continue
your driving.
2006 TUNDRA from Oct. '06 Prod. (OM34458U)