Jeep WRANGLER 2017 Owner's Manual page 490

488 MULTIMEDIA
Bluetooth Communication Link
Mobile phones have been found to lose connection to the
Uconnect Phone. When this happens, the connection can
generally be reestablished by switching the phone off/on.
Your mobile phone is recommended to remain in Bluetooth
ON mode.
Power-Up
After switching the ignition key from OFF to either the ON
or ACC position, or after a language change, you must wait
at least 15 seconds prior to using the system.