Courtesy light overhead will not go off

[Lonn]

I just received a 2013 RAM from my son. An interior courtesy light (Overhead up front) will not go out, ever. Driving, sitting, etc. I press it, to no effect. It's only the left one. I've read the book and have no idea what is going on. Scoured the forum and this appears to be an anomaly. Suggestions?

 

[mrack]

Have you checked the dimmer dial under the headlight switch?