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!!!!