The base does not come with a sub/amp/nav. The Limited generally does, and I believe our set-ups are identical. The issue you will have is that with the nav and rear speakers, the harness will not drive the rear speakers. You either have to wire the rear speakers in at the amp, or at the rear speakers, which the method describes. In talking with Crutchfield, they discovered that their "Master Sheet" was configured off of a base, which is where their plug-n-play instructions came from, and they will not apply to your car. Indeed, our conversations went so far that Crutchfield finally state that the D558BT will not work with the Crossfire HU with nav, and I should return the unit. As you research, you'll find that a few of us have figured out different ways around this (mine in my post), but step-by-step instructions are largely absent (unless you can follow my post). As to the correct harness, the 1786 might be adapted, but it was the tech's at Crutchfield, after a couple of hours on the phone and trying different applications, that finally sent me the 1784 which proved to be the one that best fit the application I used to get the speakers w/fade and balance working. Good luck.