can someone check a switch please

[3gan]

I looked behind the stereo just now
I can remember fixing a pulled wire so have just taken
a pic
it's an orange wire than plugs into the USO black connector block
on the rear if the radio
anyone know what that wire would be for ?
just thinking prior to me having this car someone
could have linked this one up and caused a problem?
just clutching at straws before its booked in at peugeot ;-(