Spare Key Programming - Using Diagnostic Equipment

Spare Key Programming - Using Diagnostic Equipment





NOTE: This procedure is used when a customer needs to have an additional key programmed into the vehicle without erasing stored key codes, but does not have 2 programmed keys available. This procedure is also useful when attempting to determine if an ignition key is damaged, as a new key can be programmed without erasing keys or without having 2 programmed keys available.

NOTE: Before programming, the new key must have the correct mechanical cut for the ignition lock cylinder.

NOTE: If 8 keys are already programmed, this procedure does not allow any more ignition keys to be programmed. The number of keys that are programmed into the Passive Anti-Theft System (PATS) can be determined by viewing the PCM PID N_KEYCODE.

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: 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. Turn the unprogrammed PATS key from the OFF position to the ON position.

2. From the scan tool, enter TOOLBOX. Select BODY - SECURITY - PATS Functions and follow the Integrated Diagnostic System (IDS) on-screen instructions to ENTER SECURITY ACCESS. For additional information, refer to Anti-Theft Security Access Component Tests and General Diagnostics.

3. NOTE: Make sure the selection made is "Program additional ignition key". If the "Ignition Key Code Erase" selection is made, all of the keys are erased from the system.

From the scan tool menu select "Program additional ignition key" and follow the IDS on-screen instructions.

4. NOTE: The 20-second delay is to allow the PCM to exit the service mode.

Turn the PATS key to the OFF position and disconnect the scan tool (wait 20 seconds).

5. Start the vehicle with the new PATS key. The vehicle can now start with the new PATS key and also with the original PATS keys.