TOYOTA 2011 Tundra - Manual (Page 268)

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2-4. Using other driving systems
When VSC/Trailer Sway Control/TRAC/A-TRAC are operating
Vehicles with multi-information display
If the vehicle is in danger of slip-
ping, or if the rear wheels (2WD
models and 2WD mode on 4WD
models) or all wheels (4WD
mode on 4WD models) spin, the
slip indicator flashes to indicate
that VSC/Trailer Sway Control/
TRAC/A-TRAC have been
engaged.
Vehicles without multi-information display