Car alarm won't shut off. - 2002 Mercury Villager

The explanation was great! Only I did not have to do all of the things state on the page. I only did the first part to unlocking doors from inside 3 times and the horn went off and then I tested the car cranking and Valla!!

Thanks For The Info.

Lot's of things can make it do it but with the drivers door window open. close and lock all the doors. ( said close the doors as in open them and close them back and make sure they close good ) Once all locked up unlock the drivers door with the key twiced once unlocks the door the second time it unlocks all the doors and the thrid time it'll unlock the hatch too. If it does'nt and the alarm is still going off open the hood and close and lock all the doors again. disconnect the battery, ( the alarm will certainly stop then), With the battery disconnected and all the doors closed and locked, put the key in the ingtion and turn it to run ( nothing will happen as the battery is disconnected ) This next part is important. The batterycables should be clean anyway but if their not they need to be clean for the next operation. With them clean put the positive on first and tighten it down now put the negiative onlike you mean it ( don't let it bounce and connect it. The alarm should'nt be going off as the car has the key on. Reach in and start the car ( I did'nt say open the door). with it running it should'nt be alarming either. Turn the key off and remove it them open the door and get in and restart the car itshould be back to normal.. Most of the time one of the door switches said to the computer that it was opened as it was supposed to be locked or it was opened after it was supposed to be locked and you left.