Re: No radio signal
To reset UConnect, press and hold at the same time for six or more seconds the round volume knob and the round browse-enter knob. Doing so is an alternative to turning off and then restarting the engine. Your UConnect is RA4.
2014 Jeep Grand Cherokee Overland 3.6L 4x4; Quadra-Lift II; Off-Road Adventure II; Advanced Technology Group. Built April 2013. At 41,000 miles transmission valve body assembly under warranty. At 43,000 miles (70 000 km) transmission replaced under warranty.