Principles of Operation

PASSIVE ANTI-THEFT SYSTEM (PATS) - PRINCIPLES OF OPERATION

The PATS is initiated by turning the ignition switch to the ON or START position. When a valid PATS key is turned to the ON or RUN position the powertrain control module (PCM) queries the PATS transceiver over circuit 1215 (WH/LG). The transceiver then reads the key code and sends the code to the PCM over circuit 1216 (GY/OG). The PCM then validates the read code against stored authorized keys. If the codes match, the PCM enables the starter motor through circuit 1419 (LG/YE). If the codes do not match, the starter remains disabled and the vehicle does not start. The PCM then flashes or turns on the anti-theft warning indicator lamp to indicate the fault.