hi all im new to forum. i have a 2001 e430 i have been using tape conversion kit to play i-phone i recently noticed an 3.5mm aux port on the driver side of my center console i was wondering if any one happens to know what this is for i tried to plug my i-phone into it and then realized i have no idea how to turn aux on dont see button or switch does anyone know it wht this port is for and how do i turn on any aux function? please and thank you all very much