Pioneer has been a solid brand for decades shouldn't cause a problem.
I would bet you fixed your problem already, weird why someone would need to unhook and rehook a battery a 100 times like you said, I would think that in one of those times someone forgot to hook something and bang you got a service light. If it happens again you may have a poor connection on one of the components that was unhooked in the process of installing that new HU. Good luck with that, I hope you don't have to go to the dealer for a code reset at $150 a pop.
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