Lighting Systems
Typical vehicle lighting system (external).

Lighting systems improve visibility at night and make a vehicle visible to other road users Figure 39-2. A lighting switch activates taillights, park lights, and headlights to allow the driver to see ahead and be seen from the side and rear. A beam selector switch allows the driver to change the beams from high to low, or vice versa, as required. Brake lights operate when the brake pedal is depressed or when a vehicle control module is automatically applying the brakes. Red or amber turn signals alert other drivers of a change in direction and are mounted so they can be seen from the front, the rear, and sometimes the sides of the automobile. The emergency flasher system operates both front and rear turn signals at the same time as a warning to others. Other circuits operate courtesy, or convenience, lights, back-up (reverse) lights, fog lights, and fault indicators.