When installing an aftermarket radio, the 70-8114 will allow the user to retain their factory-installed steering wheel controls without having to splice into factory wiring (Axxess SWC required and sold separately). In addition, we included RCAs to allow the user to retain their factory-installed 3.5mm jack. Aftermarket radio must have an AUX-In. This is an optional harness. The main power harness is still required.