Antitheft and Alarm Systems: Description and Operation

Anti-Theft

Passive Anti-Theft System (PATS) consists of the following components:

- Anti-theft indicator
- PATS key
- PATS transceiver
- Instrument Cluster (IC)
- PCM

PATS protects the vehicle from theft by preventing the engine from starting unless a programmed key is used.

Passive Anti-Theft System (PATS) Operation

PATS prevents the engine from starting by disabling the starter relay and fuel injector operation. If an unprogrammed key is used or if there is a PATS system concern, the anti-theft indicator in the IC flashes rapidly and the engine does not start. PATS cannot disable an already running engine.

Passive Anti-Theft System (PATS) Keys

Depending upon option content, the vehicle comes from the factory with one of three different key options.

Integrated Keyhead Transmitter (IKT)





For vehicles equipped with Remote Keyless Entry (RKE), the vehicle comes equipped from the factory with two programmed IKTs. The IKT incorporates both the PATS and RKE transmitter functions in a single device. The key programming is a two step procedure. PATS information is programmed into the IC and then the RKE transmitter is programmed into the Generic Electronic Module (GEM). The vehicle accepts the programming of up to 8 keys. Refer to the key programming procedures for PATS programming, and then refer to RKE Transmitter Programming in Handles, Locks, Latches and Entry Systems Remote Keyless Entry (RKE) Transmitter Programming to program the RKE transmitter.

Conventional Passive Anti-Theft System (PATS) Key

NOTE: The conventional PATS key can be identified by a blue cap with "W1" stamped in it.





The vehicle can also come equipped from the factory with two programmed conventional PATS keys (Canadian vehicles only). The vehicle accepts the programming of up to 8 keys. Refer to the key programming procedures for PATS programming. If requested by the customer this conventional key can be programmed to a vehicle equipped with IKTs. Testing and Inspection

Conventional Non-Passive Anti-Theft System (PATS) Key

NOTE: The conventional non-PATS key can be identified by a black cap.

NOTE: If this key is used on a vehicle equipped with PATS, the vehicle will experience a PATS no start.





For vehicles without PATS, the vehicle comes equipped from the factory with a conventional non-PATS key (U.S. vehicles only).