The Delphi 4G0907397J LED power module is responsible for the daytime running lights and turn signal indicators on certain Audi, VW, and Lamborghini vehicles. It fails when the daytime running lights stop working and an error is displayed, and needs to be replaced. Once replaced, the vehicle does not need to visit a dealer to code the new part. It controls the front left and right turn signals and daytime running lights on compatible Audi, VW, and Lamborghini models from 2010 to 2017.