I dont know this car well but a bit of research suggests that the satnav disc is located in the boot.
I guess you will see a facia panel (looks abit like a front load CD player) should be an eject button - just pop in new dics and system should run
Maurice
March 2011
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.