Id look back there and see what it has for wiring. I dont think the non-tow package ones had provisions for a 7 pin connector w/brakes etc. My factory tow package 04 has a quick connect behind the 7 pin plug in, and it could be electrical taped out of the way somewhere back there. Mine also had a quick connect up by the brake pedal for the controller. I can send pictures if you want. Finally, theres a dummy fuse in the underhood panel that powers trailer acc power through the 7 pin, you may see if it has any terminals in the back of the fuse box or not. Hope this helps.
At the very least, if it doesnt have any provisions for factory wiring, you could always wire in your own 7 pin connector but youd have to get an adapter since it has separate turn and brake lights. And run your blue wire all the way up to the controller and wire in the controller manually as well. Its do-able.