extra wire in back of Kangoo: what is it?

I discovered an extra set of cables in the rear of my 2002 Kangoo 4x4 dci, next to the rear speaker on the driver's side. Does anyone know what these are for? Two wires with a connector. The connector is almost the same as the one that goes to the speaker, but not quite.
I appreciate your help.
Bert

extra wire in back of Kangoo: what is it?