BWT, PATS is the anti theft system in the computer, inwhich my 99 has the PATSII system. I accidentally set mine off while changing out the CCRM or we did so somewhere along the way anyways. The only way to fix it is to have two keys, or take it to the dealer. I dont know if the PATS system is the same as the II but keep that in mind. I just let my car sit for like 3 days and we plugged everything in and it worked. WALLA Luck was with me.