Anti-Theft - Passive: Notes

The best method to confirm the correct operation of PATS is to check the LED (located in the center of the instrument panel). The LED should illuminate solid for 3 seconds when the key is turned to the run position and then extinguish. This validates the PATS functions (the key transponder matches the key code stored, the challenge/response sequence between the instrument cluster (IC) and the engine control module (ECM) was successful resulting in the ECM being enabled).

The ECM will disable the fuel injectors, ignition coils, fuel pump drive and starter if any of the following conditions apply, a theft signal has been received from the IC (the key has not been authenticated), a challenge code has been transmitted to the IC but no response code has been received, a challenge code has been transmitted to the IC and an incorrect response received.

If any of the above cases apply, the ECM will log DTC P1260. This DTC is further defined by sub-codes. The sub-codes are accessed through mode 12 (freeze frame data). Additionally the IC will log DTC's if the failure was a result of the key read.