I had a similar problem, when something in the circuit would blow the fuse. My key remotes wouldn't lock the doors, however the button on the dash would unlock. You might try that just to see. My problem was the security alarm is on the same circuit and something fried it and burns the fuse once the key is turned on. Cutting the wire was my only solution for now. Anyway, try the button as it is on a different circuit as the key remote system. otherwise emergency latch is only option.