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Radios on vehicles this new are most likely "power moded" via the vehicle communication bus. In other words, there is no wire that is "hot" when the ignition is on, and "low" when the ignition is off. Most things in the vehicle are connected directly to the vehicle battery and are told to turn on or off by the vehicle computer these days.
The good news is, there still should be several relays that are powered up when the ignition comes on, and power down with the ignition going off. Find one and tap in for your "ignition power."
Good Luck!
Mike
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