If you haven't tried this yet, set it with the radio volume dial, while the lady in the dash is speaking. That was suggested a long time ago and worked for me on a '14
Works for me too.
2013 Jeep Grand Cherokee Overland
5.7L V8, 2WD, AFE Dry drop in air filter, Quadratec mats, Sprint Booster, and Blastinbob's axleback exhaust
Build date: 9/4/12
Bought 01/27/15 with 47,200 miles