1999 concorde car alarm malfunction. If I lock doors alarm will eventually go off. I just purchased car so I don't know what was previously done to car. but they driver side door does not automatically lock and unlock with the other 3 doors, I have to lock it manually. Also the whole unit above the rear view mirror does not work, no light or readout, like NO power running to it. I don't know if this is related to doors, has anyone experienced this and what were your troubleshooting procedures, thank you