If PATS is malfunctioning, theft light will flash rapidly or glow steadily
NOTE:All elements of passive anti-theft system must be functional or vehicle will not start.
Passive Anti-Theft System (PATS) contains a theft indicator, encoded ignition key, transceiver module, instrument cluster, Powertrain Control Module (PCM), Standard Corporate Protocol (SCP) communication network and starter relay. PATS uses radio frequency identification technology to deter driveaway theft. Passive means it does not require any activity from user. PATS uses specially encoded keys containing permanently installed transponders. Each transponder contains an identification code. Each replacement encoded ignition key must be programmed into instrument cluster before it is able to start engine. Encoded keys are larger than traditional keys, do not require batteries and should last lifetime of vehicle.
Transceiver module communicates with encoded ignition key and is located behind steering column cover. Transceiver module reads encoded key and sends data to instrument cluster during each vehicle start sequence. Instrument cluster initiates key interrogation sequence when vehicle ignition switch is turned to RUN or START position. PATS uses PCM to enable or disable engine. Instrument cluster and PCM have shared security data, making them a matched pair.
PATS also disables starter motor. If instrument cluster is removed from vehicle, engine will not start. Theft indicator will prove out for 3 seconds when ignition switch is turned to RUN or START position. If PATS is malfunctioning, theft light will flash rapidly or glow steadily. PATS theft indicator flashes every 2 seconds after ignition switch is turned to OFF to act as a visual theft deterrent. PATS will not store DTC or flash theft indicator if valid encoded ignition key is used and a failure occurs in starter relay circuit.
Friday, March 6th, 2009 AT 12:23 PM