Unlimited Key Mode
Spare Key Programming - Unlimited Key Mode
Enabling Unlimited Key Mode
NOTE: Unlimited key mode is intended for use by those customers who need more than 8 keys for their vehicle.
NOTE: Before programming, the new key(s) must have the correct mechanical cut for the ignition lock cylinder.
NOTE: The unlimited key mode is set up by creating a special, unique unlimited transponder security key code and programming this key code into all of the vehicle keys so they contain the same key code.
NOTE: When in the unlimited key mode, the N_KEYCODE PID in the Instrument Cluster (IC) will always read 2, no matter how many keys are programmed to the vehicle (after the first 2 keys have been programmed to the vehicle).
1. The customer must choose an 8-digit number (except for 00000000 or 00000001) to be programmed to all of their vehicles (or, to all of the keys for one vehicle). All customer vehicles need to use the same number. Valid digits are 0-9 and the letters A-F.
2. NOTE: If the IC PID UNL_KEY_ID is not available, unlimited key mode is turned on, and must be turned off before viewing the stored code. At this time, unlimited keys may be programmed to the vehicle. To view/disable/change the stored code, follow the procedure for disabling the unlimited key mode below.
Monitor the IC PID UNL_KEY_ID and compare its value against the code chosen in Step 1. It should not be the same key code.
3. 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 Anti-Theft Security Access.
4. Once in security access, select: "program unlimited key code" and follow the IDS on-screen instructions. Enter the 8-digit code chosen by the customer in Step 1 of this procedure and follow the IDS on-screen instructions.
5. Select: "unlimited key mode ON" and follow the IDS on-screen instructions.
6. Select: "Ignition Key Code Erase" and follow the IDS on-screen instructions.
7. Disconnect the scan tool and turn the ignition switch to the off position (the key does not need to be removed at this time).
8. Turn the first Passive Anti-Theft System (PATS) key in the ignition lock cylinder to the ON position for 3 seconds.
9. Turn the first PATS key to the OFF position and remove the key from the ignition lock cylinder.
10. Insert the second PATS key into the ignition lock cylinder and turn the key to the ON position for 3 seconds.
11. Start the vehicle with both PATS keys. The vehicle now starts with both PATS keys.
12. If it is desired to program additional key(s), refer to Key Programming Using Two Programmed Keys Using Two Programmed Keys for each additional key that needs to be programmed.
Disabling Unlimited Key Mode
NOTE: By disabling the unlimited key mode, the previous access code no longer operates the vehicle.
1. From the scan tool, enter TOOLBOX. Select BODY - SECURITY - PATS Functions and follow the IDS on-screen instructions to ENTER SECURITY ACCESS. For additional information, refer to Anti-Theft Security Access Anti-Theft Security Access.
2. Select: "unlimited key mode OFF" and follow the IDS on-screen instructions.
3. Select: "Ignition Key Code Erase" and follow the IDS on-screen instructions.
4. Disconnect the scan tool and turn the ignition switch to the off position (the key does not need to be removed at this time).
5. Turn the first PATS key in the ignition lock cylinder to the ON position for 3 seconds.
6. Turn the first PATS key to the OFF position and remove the key from the ignition lock cylinder.
7. Insert the second PATS key into the ignition lock cylinder and turn the key to the ON position for 3 seconds.
8. Start the vehicle with both PATS keys. The vehicle now starts with both PATS keys.
9. NOTE: With the unlimited key mode turned off, a maximum of 8 keys can be programmed into the IC using the Key Programming Using Two Programmed Keys Using Two Programmed Keys procedure. The IC PID SPAREKEY must be enabled.
If it is desired to program additional key(s), refer to Key Programming Using Two Programmed Keys Using Two Programmed Keys for each additional key that needs to be programmed. The IC PID SPAREKEY must be enabled.