Encoded Passive Anti-Theft System (PATS) Keys

PATS  uses a special ignition key, called an Integrated Keyhead Transmitter (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  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 IC  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 does not operate and the SJB sets a memory full DTC (B1138 - Memory Full). DTC B1138 will also be flagged in the IC  . The memory that is full is referring to the memory in the SJB  . These additional keys (more than 4 IKT  keys) will start the vehicle, but will not operate the RKE  system. If additional PATS  keys are desired (more than 4, up to 8 total, IKT  and PATS  ), a standard PATS  key (a non- IKT  key) can be used. There are special procedures 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 .