How to access the high mount brake light wiring on a 2013 Honda Accord?

I'm wanting to install a 3rd brake light flasher module on a 2013 Honda Accord Sedan. I installed one on my 1999 Tacoma relatively easily, but I'm having trouble finding the wiring going to the 3rd brake light on this Honda. Anyone know exactly how the wiring is routed and the easiest way to find the main power wire going to the 3rd brake LED lights. All I need to do is spice into that wire and then ground the unit.

It's behind the rear seat. And runs under the rear deck hooked to it in several places. There was no slack in mine so go easy on it. It has a plug on the driver side about half way up maybe a little higher. I don't have pictures I was just replacing speakers/sub and sound deading.

The following procedure is for removing the rear seat if you have not done it before, it can be a little tricky.

1.) Pop up the rear seat bottom. There are two tabs on you just press with your fingers and pull then the seat bottom comes up.

2.) The driver side seat back cushion needs to come out which will reveal the brake light wire. I believe it is just a simple 10mm screw. Then to pop off the top you want to get a flathead and pry out the tab holding it into the metal chassis. Be careful cause this can break if you pull it the wrong way. In fact you probably shouldn't pull. Just use the flat head to pry/pop it out.

Hope it help. E mail if you need more help or have more questions. HTH