Paul, links may help answer your question, does not look all that simple of a task.
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How Do Disarm Mountaineer Alarm
https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwj-2bawqZvLAhVrx4MKHan1DBwQFggbMAA&url=http%3A%2F%2Fwestpacparts.com%2F2000-mercury-mountaineer-how-disable-anti-theft&usg=AFQjCNGQcyfTyOqsYeOUB-0xMhHPo2DyGQ
https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=7&cad=rja&uact=8&ved=0ahUKEwir8b_TqZvLAhWGvYMKHYmuDxwQFgg_MAY&url=https%3A%2F%2Fwww.explorerforum.com%2Fforums%2Fshowthread.php%3Ft%3D240136&usg=AFQjCNHRUFD3Wn9ESEytulRqAjcSJUlIGg
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