Key Programming Using Two Programmed Keys

NOTE: This procedure works only if 2 or more programmed ignition keys (they do not have to be Integrated Keyhead Transmitter (IKT) keys) are present. If 2 programmed Passive Anti-Theft System (PATS) keys are not available, refer to INTEGRATED KEYHEAD TRANSMITTER (IKT) KEY PROGRAMMING USING DIAGNOSTIC EQUIPMENT in this information.

NOTE: The Instrument Cluster (IC) PID SPAREKEY must be enabled for this procedure to operate. If this PID is not enabled, refer to KEY PROGRAMMING SWITCH STATE CONTROL in this information, in order to enable the customer spare key programming PID. The PID SPAREKEY is set to ENABLE when the vehicle is built.

NOTE: If the programming procedure is successful, the new key(s) starts the vehicle and the anti-theft indicator proves-out for approximately 3 seconds. If the programming procedure is not successful and the new key(s) does not start the engine, leave the key in the ON position for at least 3 seconds, then turn the key off. Repeat the key programming procedure from Step 1. If the failure repeats, refer to ANTI-THEFT in the Diagnosis and Testing portion of this information to review the DTCs and carry out the appropriate pinpoint tests.

NOTE: A minimum of 2 PATS keys must be programmed into the IC before the vehicle starts. If the MyKey™ function is enabled, one or both of the keys must be administrator (admin) keys.

NOTE: If the vehicle is in unlimited key mode, this spare key programming procedure still functions. Any 2 keys that can start the vehicle can be used to program an additional unlimited key.

NOTE: If additional keys are to be programmed, and the remaining keys are with the customer, or are not available, instruct the customer to refer to the Owner's Literature for instructions on programming the remaining keys. In this case, the IC PID SPAREKEY must be enabled.

NOTE: If the steps are not carried out as outlined, the programming procedure ends.

NOTE: Ignition keys must have a correct mechanical key cut for the vehicle and must be PATS encoded keys (contain a transponder). The key does not have to be an IKT key.

NOTE: This procedure is not necessary if only the PATS transceiver was replaced. Replacement of the transceiver does not erase the PATS key codes in the IC .

NOTE: A maximum of 8 ignition keys can be programmed to a PATS vehicle, of which up to 4 can be IKTs . If an attempt to program more than 4 IKTs occurs, the Smart Junction Box (SJB) and the Instrument Cluster (IC) set a memory full DTC B1138, and the additional IKTs will not have any Remote Keyless Entry (RKE) function capability. If the vehicle is equipped with a message center, the IC displays the message INT KEY COULD NOT PROGRAM. The PATS portion of the additional key functions, but the RKE transmitter function is inoperative.

NOTE: When in the unlimited key mode (after the first 2 keys have been programmed to the vehicle), the N_KEYCODE PID always reads 2, no matter how many keys are programmed to the vehicle.

Insert a programmed ignition key (can be an IKT or a standard PATS key) into the ignition lock cylinder and turn the key from the OFF position to the ON position (maintain the key in the ON position for a minimum of 3 seconds and less than 10 seconds).
Turn the key to the OFF position and remove the first key from the ignition lock cylinder.
Within 10 seconds of turning the key to the OFF position, insert a second programmed ignition key (can be an IKT or a standard PATS key) into the ignition lock cylinder and turn the key from the OFF position to the ON position (maintain the key in the ON position for a minimum of 3 seconds and less than 10 seconds).
Turn the second key to the OFF position and remove the key from the ignition lock cylinder.
Within 10 seconds of turning the key to the OFF position, insert the unprogrammed ignition key (the new IKT or PATS key) into the ignition lock cylinder and turn the key from the OFF position to the ON position. Leave the key in the ON position for a minimum of 6 seconds (this additional 3 second time frame allows for the RKE data transfer to take place, if programming an IKT key).
NOTE: The new key now starts the vehicle and also operates the RKE functions, if there are 4 or fewer IKT keys programmed to the vehicle (if it is an IKT key).

NOTE: The number of programmed IKT keys can be determined by viewing the SJB PID #_REMOTES. This PID can be used to determine if there are 4 or fewer IKT keys programmed into the vehicle. If any conventional fobs have been programmed, this PID is not able to determine the difference between a conventional fob and an IKT , though. If the IC PID N_KEYCODE displays 2 and the SJB PID #_REMOTES displays 3, there is probably one conventional fob programmed to the vehicle.

Start the vehicle with the new key.
- If it is an IKT key, verify the RKE functions operate correctly.
If it is desired to program additional key(s) (only up to 8 keys total can be programmed into the IC ), repeat Steps 1 - 6 for each additional key that needs to be programmed.