I recently discovered in my 2015 that if you press any of the four buttons in the ceiling-mounted light pods to turn on the "reading lights", that none of them light up, and the blue-ish green ambient light that shines down on the center stack goes out (I presume that ambient light always goes out when you turn on a map light, but I'm not sure).
It doesn't matter which map/reading light button you press, or if you press all of them - if any one of them is "on" then the dim ambient light stays off, and none of the 4 (2 up front on either side of the door-actuated dome light, and 2 in the rear for back seat passengers) light up. Strange thing is, I know the lights work (at least in the back) because when you turn off the car and open the door, the rear 2 lights come on, as well as the middle light in the front light fixture (but not the 2 on the sides).
I checked for blown fuses, and didn't see any, but I also couldn't determine exactly which fuse operates that circuit - my guess is it's shared with something else and the abbreviations in the fuse panels are fairly cryptic.
If anyone has a detailed listing of the fuses, perhaps you can tell me exactly which fuse controls the "reading lights" (as opposed to the dome lights that come on when you open the door), so I can double check it, and perhaps swap it out for a known working fuse from another circuit.
Possibly related other observations - the DRL on the passenger side (the white-ish blue corner lamp next to the headlight) doesn't come on when the car is on and not in Park (i.e. normal driving) but the driver's side does. I know that bulb isn't burned out, so I can't determine why it isn't on either. Also, the reverse / backup light below the license plate comes on but it's quite dim, as if it's not getting correct voltage. All the other lights throughout the car seem to be fine, however, and no engine codes or driveability problems. Any ideas and suggestions are appreciated.