Principles of Operation

PRINCIPLES OF OPERATION

The passive anti-theft system (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 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 (OG/LB). The PCM then validates the read code against stored authorized keys. If the codes match, the PCM then enables the starter using 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.