All indicators on vehicles are designed to let other road users know that a vehicle is about to make a turn or change lanes. Some vehicles are fitted with indicators on the wing mirrors. Indicators on wing mirrors are positioned on the front-facing section of the mirror on the opposite side to the mirror itself. These give extra warning to other road users especially from a head-on or side viewpoint. The wing mirror indicator is located on the side of the vehicle and is usually attached to the door. Some vehicles have the option of wing mirrors that can be electrically folded flat against the vehicle when not required.
The wing mirror indicator, along with all other indicators, is operated by a lever or stalk on the steering column. When the stalk is pushed down or up either the left or right indicators will flash regularly until the stalk is pushed back to its middle position.
If a wing mirror indicator fails to operate it is most likely due to a blown bulb, poor connections between the bulb and the bulb-holder or an indicator relay malfunction.