I purchased a couple of different cables to find the best head unit install option. Most searches pull up simple adapters but if you want steering controls and
don't want to cut into the factory wiring there is a better option.
A company called Auto Harness House specializes in Subaru wiring and makes a 20-pin that works with our 370z cars. It has the four additional wires to connect a
Metra Axxess ASWC-1.
