A system to remotely configure an aftermarket interface module using a graphical user interface (“GUI”) is disclosed. The system includes a GUI adapted to display on a computer. The GUI permits a user to select a vehicle model, year and make to determine the functions of the OEM controls. In addition, the GUI permits a user to select an aftermarket electronics brand and model that the OEM controls will operate. The user selects a particular control signal configuration using the GUI for each of the OEM controls. An interface module is flash programmed with the particular control signal configuration. The interface module is connected to the OEM controls and the aftermarket electronics, where the interface module receives the OEM control signals and controls the aftermarket electronics using the particular control signal configuration.