Passive Anti-Theft System (PATS) Module
WARNING: This page is about a different car, the 1997 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
PATS module contains circuitry to interface to vehicle electrical system, transceiver module, Module Communications Network (MCN) system and THEFT indicator light. PATS module stores ignition key codes in non-volatile memory. PATS module can be diagnosed through Data Link Connector (DLC).