Section 15 (Anti-Theft System - Passive): Description

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.

Passive Anti-Theft System (PATS) vehicle protection system is designed to prevent driveaway thefts. The system is passive in that it does not require any activity from the user. System uses radio frequency identification technology to verify if proper key is being used to attempt to start the vehicle.

During each starting sequence, the encoded ignition key is interrogated by vehicle anti-theft electronics. If the key's identification code is programmed into anti-theft system, vehicle is capable of starting. If key's identification code is incorrect or missing, vehicle is prevented from starting.

PATS module communicates with the Powertrain Control Module (PCM) via Module Communication Network (MCN). PCM then determines if engine will be enabled to start. PATS varies from anti-theft system in that the passive vehicle protection system enables or disables vehicle from starting and only operates with ignition switch in RUN or START position. Anti-theft system operates only when ignition is off.

PATS vehicle protection system consists of these components: PATS module, anti-theft indicator (THEFT) light, transceiver module, encoded ignition key, module communications network and Data Link Connector (DLC).