Uconnect 6.5A Owner's Manual Supplement page 28

26 RADIO MODE
When AUX Volume is On, the radio volume is adjusted to
compensate for the AUX device volume.
Auto-On Radio
Press the "On" button to activate the Auto-On Radio
feature. Press "Off" button to deactivate this feature.
Press the "Recall Last" button to recall the last radio
setting, whether the radio was on or off at the last
ignition OFF.