Just sharing this in case someone finds this thread while researching 2015.
I have a 2015 Silverado 1500 LT.
I'm adding a dashcam hardwire kit which allows for ACC and Constant power (for parking monitor)
Here's what I found in the left/driver's side fuse box:
- Fuses 2, 30, 31, and 32 appear to be ACC/switched
- The rest seem to be constant
- 9 was a spare, so I'm using that to tap for the constant
- 32 is heated steering wheel (which I don't have), so I'm tapping into that for ACC/Switched
- Line sides are highlighted with blue marker
Sorry for the crude labels. Hope this helps someone.