Cruise Control Problem on Citroen Xsara Picasso?

[meeeee]

Hi, I have recently brought a Citroen Xsara Picasso and have been trying to use the cruise control. To avoid any confusion, mine has a special stalk unit that sticks out under the indicator stalk to operate cruise control. It has a on/off switch on the middle front, a button on the end and two buttons (top and bottom) on the back. I have tried using it when in 5th at about 70-75MPH. I flick the switch and it displays on the screen:

cc ------
OFF

I try to set the speed by pressing one of the back buttons. The display flashes but doesn't set a speed. I have tried all the buttons and combinations of buttons with little luck, I got it to work once, but i don't know how. Can anyone advise on how this is meant to work. I have been advised by a friend that I may have 'confused' it and i need to reset it. Can anyone advise on how this is done, something to do with the battery? t.
Thanks in advance.

[Unregistered]

mine has the same problem ... did you sort it? how?

[Unregistered]

Ive the same problem. did you sort it; how?