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Enabling Unlimited Key Mode

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
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.
  1. The customer must choose an 8-digit number (except for 00000000 or 00000001) to be programmed to all of their vehicles. All customer vehicles need to use the same number. Valid digits are 0-9 and the letters A-F.
    2. NOTE: If the PID UNL_KEY 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/change the stored code, follow the procedure for disabling the unlimited key mode below.
  2. Monitor the PID UNL_KEY and compare its value against the code chosen in Step 1. It should not be the same key code.
  3. From the scan tool, follow the on-screen instructions to ENTER SECURITY ACCESS. For additional information, refer to Anti-Theft Security Access  in this article.
  4. Once in security access, if the unlimited transponder security key PID is 00000000 or 00000001, select: "program unlimited key code" and press the tick mark. Enter the 8-digit code chosen by the customer in Step 1 of this procedure and press the tick mark.
  5. Select: "unlimited key mode ON" and press the tick mark.
  6. Select: "Ignition Key Code Erase" and press the tick mark.
  7. Disconnect the scan tool and turn the ignition switch to OFF.
  8. Insert the first PATS key into the ignition lock cylinder and turn the key to the ON position for 3 seconds.
  9. Remove the first PATS key from the ignition lock cylinder.
  10. Insert the next PATS key into the ignition lock cylinder and turn the key to the ON position for 3 seconds.
  11. If it is desired to program an additional key(s), refer to Key Programming Using Two Programmed Keys  in this article for each additional key that needs to be programmed.
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