Hello, first off thanks for checking out the thread, I've been scouring the web for information and cannot find much to trust as information is in opposition to one another.

Onto the nitty gritty. I'm sticking with the stock headunit, adding an Kicker KEYLOC, amp, and two subs. The part I'm stuck at is that I can't find a wiring diagram for the rear deck speakers to tap into to run to the LOC. I just need the 200hz and below and the Kicker KEYLOC will help with any filters from the stock system. I've been waiting to finish the install due to not wanting to stuggle with wirong for hours on end, though of course that is my final option. I rather tap into the rear deck since those are the subwoofers of the JBL system and they're closest to the trunk. Please send help on my journey if researching this lol. I used to add amps, subs, and headunits, but this factory system is much more complex and I don't to goof up. I'm limited on tools, basically a multimeter and various other tools for installation.

EDIT: At the amps pin, i saw that the Woofer 1's negative is white with black stripe, positive is white with pink stripe. Woofer 2's negative ia white with red stripe, poaitive white with purple stripe. Is this true AT the woofers themselves? Also would the 12v wire be grey?

 

How many total speaker does this system have?

Your wiring colors don't match. See private message.