J250 connector wires radio

I've got a Nissan Micra k12 2008 with a double DIN pp-3001m radio.
The headunit has got three connectors. One for the antenna and one for the main connector. But there's also a third connector called J250 (audio-bus)
When I plug in the attend a connector and the main connector everything works also my steering controls.I want to connect a sub woofer to my radio but I think the wires from the third connector lead somewhere in the car.but I can't find it anywhere.

does anybody know where those wires are leading up so I can connect the sub speakers to it?
 

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