Check operation by selecting the defrost mode and place the blower control on high speed. You should be able to feel the air directed against the windshield. See your authorized dealer for service if your defroster is inoperable.
See also:
Engine
...
7. Turn Signal Indicators
The arrows will flash in unison with the exterior turn signal, when using the
turn signal lever. ...
If an exterior light burns out
For the type of bulb and power rating, see “When needing to change a bulb”. ...