Maybe power connection? What does it do when it's in PC mode

The light just turns off. No longer is affected by any sort of motion.

Maybe Photovoltaic Cell?

I don't think so... I at least can't see any place that solar would be charging up on it.

I'm not sure literally what it stands for, but it activates the dusk to dawn sensor.

[deleted]

Mmm that may be the case, yeah

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I'm Thinking photo cell. Meaning it will turn on and off with sun/no sun instead of motion.

I bet this guy is right. Auto might make it a motion sensor light. PC makes it a dusk till dawn light.

The light switch it's connected to has to stay on