I have a 99 grand caravan and the anti theft alarm went off and I can't get it to stop. Don't have a remote but have tried the key in the drivers door. It used to work when we set the alarm off before. I have tried disconnecting the battery then using the key but still don't work. Could it be the drivers door lock or would it be the BCM? The drivers door hasn't been locking with the power lock for a while. Any help would be great.