Back in 2009 when I took delivery of my new truck it had a wiring fault, an intermittant short causing a fuse to blow. Long story, a steel clip had sliced the wire but only made contact occasionally when I hit a bump or closed the rear door hard enough, took them a month to find it.
There is a point to my story, and here it is:
When that fuse blew it took out my dome lights, steering wheel controls, and a few of the buttons on the center stack. I want to say the tow/haul button and maybe the inverter... Can't remember exactly, and I don't recall how the fuse was labelled but I know it did not say "Steering Wheel Controls"
It may have been labelled "Dome Light" or something like that.
Point I am making is the steering wheel controls were definitely tied in to something else electrically.
Is there anything else not working in your truck? I would check any and all fuses that have anything to do with the interior of the truck. Maybe you'll find it.
Good luck!