I own a 2000 Mustang and my keyless remote is no longer working properly. I push the 'lock' and the 'unlock' and it does not activate my command. The trunk button and the siren still work. When I sit inside of the car and press the lock button a couple times, the mustang horn beeps twice followed by a small beep coming from the inside of the car as if it were some type of an error message. Hope you can help out. Thank you .
              - just replaced the batteries.