When i Turn my ignition on my doors unlock???

i have a Vauxhall Corsa(96) and i was installing an aftermarket Remote Unit and it was working until i placed the Door card back on and heard a spark , which the cars Central locking now does not work via key OR remote however does work throught the ignition which it didint do before?! when i switch the ignition on the doors unlock, and when i turn the ignition off the doors lock, going back to not having central locking through the key........ can someone please help me !!!! its got me absoloutley baffalled!!!!

Chris Kendall
November 2006