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You guys have good ideas, however, there is only 4 wires which could cause that. One of which is illumination which he said was not hooked up. Feel free to test yellow, red and black, but I am sticking by my theory of a bad head unit.
You did leave the aftermarket harness connected when I asked if you can reproduce the problem with the head unit disconnected right? If not try that, could be a bad harness.
Good luck
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