Many car stereos actually send the play signal when they connect to a device. My Alpine unit did this, as does my Pioneer AVH-4100NEX. Also guilty: 2014 Ford F

Many car stereos actually send the play signal when they connect to a device. My Alpine unit did this, as does my Pioneer AVH-4100NEX. Also guilty: 2014 Ford Focus ST and Ford Fiesta ST I tried, as well as a late model Mercedes ML500.