When the switch lever is moved downwards from the middle position, the left turn signals are turned on, and when the lever is moved upwards, the right turn signals are turned on. After the turn is completed, the switch lever automatically returns to the middle position and the turn signals are turned off. If one of the turn signal indicator lights flashes at an increased rate or lights up but does not flash, or does not light up at all, this indicates a malfunction in the turn signal circuit. Check the condition of the fuses and bulbs.