Problems With C3 With New Headunit

[connellyg]

I have just recently installed a alpine headunit in a c3 LX 2003.

 

i have a few problems with the unit and the central locking. Ill explain..

 

With the stock tape deck the button on the central locking worked...right...

 

so i installed my new headunit..all was fine switch car on tuned the presets in..put all settings in. everything was fine...made a cup of tea..came back to check (well play) with it..lost all settings key for central locking wont work..open drivers side door press button on the key fob the button works...

 

can someone please explain why this is happning.. how i can fix it...what adaptors i need. and from..

 

Thank You