The Aerpro APP0141 is a Primary Harness designed to suit various Daihatsu, Holden, Lexus, Subaru & Toyota vehicles with small two plug connectors. It allows for the installation of an aftermarket headunit without the need to remove the factory wiring plug from the vehicle. APP0141 converts the factory headunit plug in the vehicle into a universal double ISO connector system. For simple plug and play headunit installation, add an Aerpro APP8 Secondary Headunit harness to suit your new aftermarket headunit and the two looms will connect together via the ISO connector system.