1. Turn signal switch is in the off working position. Since the left or right turn signal contact is not connected, no working current is transmitted to the left or right turn signal circuit, and no working current passes through the left or right turn signal, the left or right turn signal cannot be put into operation. Although the contact of the position lamp is on, no working electricity is transmitted through the contact of the position lamp to the position lamp because the lighting switch is not on, and no working current passes through the position lamp. So the position light doesn't work.

2. The turn signal switch is in the working position of left or right steering. Due to the left or right turn signals contact has been switched on, the working current to the left or right turn signals, and the working current flasher relay, a turn signal switch, a left or right turn signals a grounding, communication, left or right turn signals circuit working current through the left or right turn signals, to work, left or right turn signals with rhythm, the flashing, left or right turn signal.