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.
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NOT-REQ8 Unit has plugs to suit Toyota for power and speakers
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