GM Genuine Parts Combination Switches are designed, engineered, and tested to rigorous standards, and are backed by General Motors. It is a complex switch that controls multiple functions such as the headlights, turn signals, cruise control, and windshield wipers on your vehicle. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).