You should turn on your turn signal before you need to brake for the turn.
100 feet
100 yards
300 feet.
200 feet before the turn according the the IL driving school test answer (1 city block)
the same as vehicles, about the length of two houses from where you are turning
100 ft.
500 feet
Motor vehicle laws differ from state to state. Some states do not have a law informing drivers as to how far in advance their turn signals need to be activated. A good rule of thumb is to signal in no less than 100 feet before your turn. This is also a courtesy to other drivers, so they are aware of your next move.
You should use your turn signal in far enough advance so the car behind you knows you are going to turn and has enough time to slow down. However, putting the turn signal on too far in advance can be confusing because the following car will not know exactly when you are going to turn.
100 ft
In the 2002 Hyundai Sonata the turn signal flasher is located on the driver side below the fuse box in the far left corner of the floor board