TOYOTA 2010 Prius - Manual (Page 208)

182
2-2. Instrument cluster
Touch tracer display (if equipped)
When the audio control switches,
climate control switches, “DISP”
switch or “TRIP” switch of the
steering wheel are touched, the
touch tracer display will appear
in front of the gauges, with the
touched switch highlighted to
allow the driver to identify the
switch that is being operated.
The switch can then be operated
by further presses.