Do I need a PAC to use with aftermaket stereo on Wrangler JKU with NO SWC?

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Hello,

I want to replace my factory pos with a Joyiung HU and my own amp and own speaker wires. Also, I already have a switched power with a 40a relay to use.

Since I have no problem supplying switched power and I have my own amp \ speaker wire runs . . . what would a PAC actually still do for me?

Will my 2009 Wrangler throw codes? What's the down sides?

Reverse wiring? Lights on - dimming?

Supposing the answer boils down to YES, I would still need a PAC to simplify additional wiring or to not throw codes, what is the least PAC style I need for my rig that does not have SWC to use?

Thanks in advance.

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