Encoded Passive Anti-Theft System (PATS) Keys

PATS  uses a special ignition key, called an IKT  key that is larger than a conventional ignition key. It contains a permanently installed electronic device called a transponder and also has the Remote Keyless Entry (RKE) transmitter integrated into the keyhead. Each transponder contains a unique encrypted identification code which is one of a very large number of combinations. The addition of this transponder to the key makes it an "encoded" key. The PATS  portion of the IKT  key does not require batteries and should last the lifetime of the vehicle. The transmitter portion of the IKT  key has a battery. Each PATS  key must be programmed into the IPC  before it can be used to start the vehicle. A maximum of 4 IKT  keys can be programmed to start the vehicle and also operate the RKE  functions. If more than 4 IKT  keys are programmed, the RKE  portion of the additional IKT  keys do not operate and the SJB  sets DTC B1138, and the IPC  sets DTC B109E:42 (both DTCs indicate a memory full condition). These additional keys start the vehicle, but cannot operate the RKE  system, as only the first 4 IKT  keys programmed have that RKE  functionality. If additional PATS  keys are desired, a standard PATS  key (a non-IKT  key) can be used. There are specific general procedures described in this service information that must be carried out if a new PATS  key is necessary. Refer to INTEGRATED KEYHEAD TRANSMITTER (IKT) KEY PROGRAMMING USING DIAGNOSTIC EQUIPMENT  or KEY PROGRAMMING USING TWO PROGRAMMED KEYS  .