So today I left my 1997 c280 and locked the doors with the transmitter and it worked fine. When I came back, the transmitter would not work, and neither would the key in the manual lock on the passenger side door. The Lock button on the dash is blinking but I am not sure if that means the transmitter or manual locks are disabled. I tried changing the batteries in both of my transmitters but that didn't work. I know one of the transmitters is functioning because the red light will light up when I hold down the button. Does anyone have any ideas about how to unlock the doors?? Any help is greatly appreciated.