Does anyone know whether or not an '09 XL regular cab would be wired for rear speakers?

I replaced the stock AM/FM (non-integrated) radio with a Pioneer DEH-X5500HD, and I thought I'd cut holes in the rear trim panels (where the other trim levels have speakers) and pop some round speakers in there if there's wiring for them.

Thanks!

 

I'd be surprised if there was wiring for speakers back there considering you'd be cutting holes for said speakers. I don't see why you couldn't wire said speakers to your new Pioneer deck though.

 

I have a 2013 F150XL standard cab. Installed a Pioneer radio and noticed that there are wires for rear speakers. I installed rear surface mount speakers and was able to tap into the wiring under each sill plate. Ford color code is LR+ W/G, LR- Brown/ Y, RR+ Brown/W, RR- Brown/Blue.

 

Oh, interesting. This is kinda low on my to-do list these days, but that's exactly the info I was looking for. Thanks!