You have fault with your unit,just had a new unit fitted by Citroen this seemes to be a fault with them,if no warranty on vehicle,beater to buy one off the shelf with mp3 player,to costly to get a repair on it done.You can buy a standard set and face panel,down side the controls on the colum have no use.Should you go down this route put in your own feed for the unit,and just conect the wires for the speakers
aughton.w
October 2007