You need to go to your carvariations file and edit the sirensettings and lightsettings line for the Flatbed model. For instance: I set mine to lightsettings value="23" and sirensettings value="1" The carvariations file is located in this path way in your open IV. OpenIV>GTAV>mods>update>update.rpf>x64>data Just jumped in my game and tested it and responds with ELS activated!