GM Genuine Parts 13498958 Automatic Headlamp Control Ambient Light Sensor;

An ACDelco GM Original Equipment Ambient Light Sensor is a GM-recommended replacement for your vehicle’s original component. It measures the amount of ambient light available to the driver so that vehicle displays can adjust their brightness settings automatically. It helps conserve energy and enhances the visual quality of electronic devices. This original equipment ambient light sensor has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.