The primary harness is the harness that plugs into your cars main entertainment system connector and converts it into a double ISO connector system (Universal).
After selecting your primary harness you then select a secondary harness to connect between the ISO connectors and the aftermarket head unit that you have ( this is selected based on what brand and type of head unit you have.
We carry both non-steering wheel control type primary harnesses and steering wheel control type.
ISO Connector to Lexus IS200 for factory AMP bypass