Electrical connecting for trailer hitch 2019 CX-9

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Mazda CX9 Signature 2016
I know how to connect a standard 4-wire trailer connection. My trailer also requires a 5th wire connected into the reverse light circuit. Where can I find the reverse wire on the car?
 
I know how to connect a standard 4-wire trailer connection. My trailer also requires a 5th wire connected into the reverse light circuit. Where can I find the reverse wire on the car?

At the reverse light bulb socket? (shrug)
 
Mazdadude, the socket is in the rear hatch, I need the reverse circuit wire before it goes into the hatch. I don't think you understood my question.
 
Mazdadude, the socket is in the rear hatch, I need the reverse circuit wire before it goes into the hatch. I don't think you understood my question.

Yes I understood, however sm1ke gave a better more complete answer than mine.;)
 
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