Deadlock system

If the issue is that the remote buttons on the key no longer unlock the doors, then the problem can be addressed at the key. But if you mean that the doors will not unlock even if you put the key in the keyhole in the driver's door, that's a much larger problem. The so-called deadbolt system prevents the doors from being opened from the inside or the outside until deadbolt is released, which happens when the doors are unlocked. So, need more information about the specifics of the issue before I can give you a real answer.