I wondered the same thing, so I pressed away - nothing seemed to happen.I thought the Emergency / Roadside assistance button was on the upper middle console on both the US and European versions. If so then that button is a mystery. There is nothing in the US or Spain manuals that indicate what that button could be.
If pressing it and it flashing blue I would think it is trying to establish a Bluetooth signal from a phone (thus the phone icon on the button) but then it again it could be for something else.
TS