GM Genuine Parts Ignition Switch Actuators are designed, engineered, and tested to rigorous standards, and are backed by General Motors.. These actuators trigger an electrical signal to the vehicle's engine starter, allowing the vehicle to start. It also helps keep the key secure in the ignition. 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).