Connector on Back side of Center Arm Rest
 

All,
I own a 2004 S80 AWD. I a trying to find an expensive way to hook up an iPod to the system. Volvo has discontinued the adapter and what I've been able to find online have been $250+.
I have found a connector on the bottom of the center arm-rest facing the back seat. It is right beside of the cigarette lighter but is not hooked up to anything. I have downloaded the wiring diagrams for the car but am not sure where to look. Does anyone know what this connector is and what it can be used for? Thank you.