Antitheft and Alarm Systems: Description and Operation

Anti-Theft

NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).

The Passive Anti-Theft System (PATS) on the hybrid version consists of the following components:

- Anti-theft indicator (located in the Instrument Cluster (IC))
- Encoded ignition Integrated Keyhead Transmitter (IKT) PATS key(s) (the key contains a transponder and a Remote Keyless Entry (RKE) transmitter)
- Encoded (the key contains a transponder) ignition PATS keys (not factory equipped, but can be used in place of IKT keys)
- PATS transceiver
- IC
- Transmission Control Module (TCM)

PATS uses radio frequency identification technology to deter a drive-away theft. Passive means that it does not require any activity by the user.

The vehicle is equipped with 2 IKT PATS keys. The IKTs operate as a standard PATS key with an RKE transmitter incorporated into the keyhead. The IKTs require batteries for the RKE transmitter to operate. A maximum of 4 IKT keys can be programmed to operate the vehicle. If more than 4 IKT keys are programmed, the RKE portion of the additional keys do not operate and the Smart Junction Box (SJB) (and the IC) sets a memory full DTC (B1138 - Memory Full). These additional keys start the vehicle, but do not operate the RKE system. If additional PATS keys are desired, a standard PATS key (a non-IKT key) can be used. For the purposes, the PATS portion of the IKT key is referred to as a PATS key.

Passive Anti-Theft System (PATS) Function

NOTE: If the IC or the TCM (or both) is replaced, the parameters must be reset in both modules or the vehicle experiences a PATS no-start. Refer to Passive Anti-Theft System (PATS) Parameter Reset Passive Anti-Theft System (PATS).

NOTE: When using the Integrated Diagnostic System (IDS), the IC and the TCM parameters are reset at the same time.

The PATS function is controlled by the IC. The IC is used to carry out all of the PATS functions such as receiving the identification code from the PATS key, controlling the Electronically Controlled Continuously Variable Transmission (eCVT) and fuel injector(s) enable, and initiating 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 TCM, there are parameters that must be set if the IC or the TCM (or both) is replaced. Refer to Passive Anti-Theft System (PATS) Parameter Reset Passive Anti-Theft System (PATS). If any of the components are not working correctly, the vehicle does 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 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 does not disable a running vehicle.

When operating properly, the Hybrid normally shuts down the engine after it has been idling for approximately 2 minutes, and the anti-theft indicator does not illuminate. As soon as the driver presses the accelerator, the Hybrid either starts the engine and accelerate the vehicle, or the traction motor in the eCVT causes the Hybrid to accelerate. Depending on how much pressure is applied to the accelerator pedal, the TCM determines if only the traction motor engages, or the engine starts, or both the traction motor and the engine causes the Hybrid to accelerate. If the engine shuts down, it can be due to normal Hybrid operation. At this time, always check to see if the anti-theft indicator is flashing or glowing (PATS concern) or if it is not illuminated. PATS always affects the starting of the vehicle, whether the traction motor or the engine (or both) cause the Hybrid to start and accelerate. PATS does not cause a running vehicle to stall.

PATS can cause a vehicle no start due to either the fuel injectors not operating or the TCM not cranking the engine, or both. Always check for PATS DTCs from the IC and the TCM when a no-crank or no-start condition exists. A low state of charge in the vehicle battery can cause the PATS to allow the TCM 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 can be due to a PATS concern. If the anti-theft indicator proves out, it cannot be a PATS concern. If the anti-theft indicator does not illuminate at all, it can be an IC concern. Refer to the Symptom Chart. Symptom Related Diagnostic Procedures

The PATS function uses the IC and the TCM 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 does not start. If there is a PATS concern present, the IC sends a message to the PCM to not allow fuel injector operation and should send a message to the TCM to not start the engine. If the vehicle starts and stalls, or the engine does not start at all, check the anti-theft indicator operation and if flashing or glowing, retrieve DTCs from the IC and the PCM and follow the PATS diagnostics.

PATS is not compatible with aftermarket remote start systems, which allow the vehicle to be started from the exterior of the vehicle. These systems can reduce the security of the vehicle, and also can 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 disables the vehicle from starting if there is:

- a damaged PATS key.
- an unprogrammed PATS key.
- a non-encoded key (a conventional key or one that does not have any electronics).
- damaged wiring.
- a damaged transceiver.
- a damaged IC.
- a damaged TCM.

Unlimited Key Mode

This system contains a feature called unlimited key mode. This feature allows a customer to program more than 8 vehicle keys, if requested. Each vehicle in unlimited key mode is set up with a special unlimited transponder security key code. This allows all the customer vehicles to share the same mechanically cut keys. For an individual customer, any randomly selected security key that has been previously mechanically cut and electronically programmed to the vehicle is acceptable. Refer to Spare Key Programming - Unlimited Key Mode Unlimited Key Mode.