Hello all, I recently bought a 2016 LS, which according to the brochure has a "4 speakers". Well, I finally found out that this meant the two front door speakers + the 2 tweeters in the front pillars. I looked in the speaker grills in the back doors and they're empty! Also, when I go to adjust the balance/fade, I only have a slider for the front of the car. My question is: do you guys know if the wiring is still there despite not having the rear speakers or I'd have to run new wiring? Thanks