HONDA 2012 Insight - Owner's Manual - Manual (Page 154)

The outside mirrors are heated to
remove fog and frost. With the
ignition switch in the ON (II)
position, turn on the heaters by
pressing the rear window defogger
button. The indicator in the button
comes on as a reminder. Press the
button again to turn the heaters and
the defogger off.
This heated mirror function has a
timer (see page
). 126
On U.S. EX models and all Canadian
models
Power Mirror Heaters
Mirrors
148
HEATED MIRROR BUTTON