2014 Jeep Grand Cherokee
with Uconnect 8.4AN AM/FM/BT/NAV
The Messaging button is greyed out and incoming text are not being read aloud when Samsung Galaxy S4 phone is paired to the Uconnect.
Work around solution to get the messaging button to work:
Just download the fitbit app on your phone
Fitbit App Gallery
The fitbit app contains the technology that will allow both devices to communicate and allow the messaging button to work in your 2014 Jeep Grand Cherokee.