I don't understand why every time this comes up nobody has the answer to this? It should be pretty common knowledge here by now that the harness is useless. There is no true constant or switched power source. You have to tap fuses from the fuse box to get your power sources.
I had issues installing my head unit as well, because from what I read I thought I only needed constant power tapped from somewhere else. Unit still didn't work and I ended up having to tap both power sources from fuse box. Search around and you will find what you need.
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