Key Programming Using Two Programmed Keys

NOTE: This procedure only works 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 section.

NOTE: The Instrument Panel Cluster (IPC) 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 section, 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 section to review the DTCs and carry out the appropriate pinpoint tests.

NOTE: A minimum of 2 PATS keys must be programmed into the IPC before the vehicle starts.

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 IPC PID SPAREKEY must be set to Enable.

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 IPC .

NOTE: A maximum of 8 ignition keys can be programmed to a PATS vehicle, of which up to 4 can be IKT keys. If an attempt to program more than 4 IKT keys occurs, the Smart Junction Box (SJB) sets a memory full DTC B1138 with the IPC setting a memory full DTC B109E:42, and the additional IKT keys do not have any Remote Keyless Entry (RKE) function capability. If the vehicle is equipped with a message center, the IPC 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.

1. 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.

2. Leave the key in the ON position for 3 seconds, but not longer than 10 seconds.

3. Turn the key to the OFF position and remove the first key.

4. 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.

5. Leave the key in the ON position for 3 seconds, but not longer than 10 seconds.

6. Turn the key to the OFF position and remove the second key.

7. Within 20 seconds of turning the key to the OFF position, insert the unprogrammed ignition key (new PATS or IKT 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).

8. 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.

   Start the vehicle with the new key.
   • If it is an IKT key, verify the RKE functions operate correctly.

9. If additional programmed keys are desired, repeat Steps 1-8.