For a 99 it is behind the right rear quarter trim panel.
you have to unlock the passenger door from the outside with the key
To disable a factory installed alarm on a 1999 Mercury Cougar, place the key in the ignition. Turn the key only halfway and let it sit in that position for 10 minutes before starting the vehicle.
You can disarm your 1997 Mercury Cougar alarm system by removing the alarm system fuse. The alarm system fuse can be found in the fuse box.
Plug in your seatbelt.
Why, are you going to steal one?
put the key in the door and turn it to unlock
The factory alarm is part of the body and engine computers.
To disable the factory alarm on a 2000 Mercury Villager, put the key in the ignition and turn it halfway. Let it stay in the spot for 10 minutes and start the car.
The factory alarm is built in both the engine and body computers. There is no alarm box.
Insert your key into your door then turn and hold it for about 5 seconds. That should do it!
it could be something wrong with the ignition switch, and or alarm
Had the same problem. You can reset it by unlocking either door with the key.