How do you disarm the alarm on a 1999 ford explorer?

To disarm the alarm on a 1999 Ford Explorer, insert the key into the driver's door and turn it to unlock. This should deactivate the alarm system. If the alarm persists, you can also try starting the engine with the key, which may reset the system. If these methods don’t work, consult the owner's manual for additional instructions or check the vehicle's battery.