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Passive anti-theft system transceiver
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Powertrain control module (incorporating PATS)
Passive Anti-Theft System (PATS)
The Passive Anti-Theft System (PATS) is fully passive in operation and requires no special procedures by the driver to arm or disarm the system. It is invisible to normal scrutiny and is operated by a miniature transponder within the key body. This communicates with the module through a transceiver mounted around the ignition switch lock cylinder.
The PATS functionality is incorporated within the Powertrain Control Module (PCM).
PATS may be identified by a larger sized ignition key which indicates the presence of the transponder that controls the system.
The transponder code reading is carried out when the key (having been inserted into the ignition lock cylinder) is turned from position 0 to position III to crank the engine. If the PCM receives the correct code, the engine will start. If the PCM receives either no code or an incorrect code, the engine will not crank as the PATS is still armed.
Anti-Theft Indicator
Whenever the ignition is switched to position II the anti-theft indicator will remain on for three seconds while the system carries out an initial ignition key read.
The anti-theft indicator will flash every 2 seconds at ignition position 0 to indicate the PATS has immobilized the engine. This acts as a visual theft deterrent.
For additional information on the PATS principles of operation, refer to the Diagnosis and Testing procedure in this section.
Anti-Theft – SCP PATS (Vehicle with Petrol Engines built before 05/98)
