Citroen c5 data link power supply ?

Hi all, I have a 2008 Citroen c5 1.6l diesel car and I had to have some codes erased with a up to date code reader but when the mechanic hooked up the reader there was no power to the data link socket in the glove box. The fuse that is linked to the socket was not blown and was wondering if anyone could heap solve this problem.
Thanks
jp