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Passive Anti-Theft System (PATS) Function

NOTE: If the IC  or the PCM (or both) is replaced, the parameters must be reset in both modules or the vehicle will experience a PATS  no-start. Refer to PASSIVE ANTI-THEFT SYSTEM (PATS) PARAMETER RESET .
NOTE: When using the Integrated Diagnostic System (IDS), the IC  and the PCM parameters are reset at the same time.

The PATS  function is controlled by the IC  . PATS  uses the IC  to carry out all of the PATS  functions such as receiving the identification code from the PATS  key, sending a signal to the PCM to control the starter and fuel injectors enable, and initiates the key interrogation sequence when the ignition key is turned to the ON or START position. Because of the interaction between the IC and the PCM, there are parameters that must be set if the IC  or the PCM (or both) is replaced. Refer to PASSIVE ANTI-THEFT SYSTEM (PATS) PARAMETER RESET . All elements of PATS  must be functional before the vehicle will start. If any of the components are not working correctly, the vehicle will not start. If the IC  must be replaced for any reason (PATS  concerns or IC  concerns), the PATS  keys must be programmed into the new IC  . Refer to INTEGRATED KEYHEAD TRANSMITTER (IKT) KEY PROGRAMMING USING DIAGNOSTIC EQUIPMENT .

PATS  is active only for a few seconds when the vehicle is starting. It is not a PATS  concern if the vehicle stalls after it has been running for a minimum of 3 seconds. PATS  will not disable a running vehicle.

PATS  may cause a vehicle no start due to either the fuel injectors or the starter not operating, or both. Always check for PATS  DTCs from the IC  and the PCM when a no-crank or no-start condition exists. A low state of charge in the vehicle battery may cause the PATS  to allow the starter to crank the engine, but prevent the fuel injectors from operating. If the anti-theft indicator does not prove out (it may be either flashing or glowing steadily) and one (or both) of the previous conditions (fuel injectors and/or engine won't crank) are present, it may be due to a PATS  concern. If the anti-theft indicator proves out, it may not be a PATS  concern. If the antitheft indicator does not illuminate at all, it may be an IC  concern. GO to SYMPTOM CHART .

The PATS  function uses the IC  and the PCM to enable or disable the engine. All elements of PATS  must be functional before the engine is allowed to start. If any of the components are not working correctly, the vehicle will not start. If there is a PATS  concern present, the IC  will send a message to the PCM to not allow fuel injector operation and also not allow starter operation. If the vehicle starts and stalls, or the engine will not start at all, check the anti-theft indicator operation and if flashing or glowing, retrieve the DTCs from the IC  and the PCM and follow the PATS  .

PATS  is not compatible with aftermarket remote start systems, which allow the vehicle to be started from the exterior of the vehicle. These systems may reduce the security of the vehicle, and also may be the cause of no-start concerns. Remote start systems must be removed from the vehicle before any PATS  -related no-start concerns are investigated.

PATS  will disable the vehicle from starting if there is:

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