You can not program anything with a scanner, second, if you unhook or take the power away from a pats system for how ever long it will retain it's memory, it is just like a computer. Because you replaced the harness it was a disconnect to the theft system and it probably needs reset, not just the keys. Here is a guide to help
https://www.2carpros.com/articles/how-to-reset-a-security-system
Please let us know if you need anything else to get the problem fixed.
It is not recommended to disable the Passive Anti-Theft System (PATS) on your 2005 Ford Excursion as it is an important security feature designed to prevent unauthorized use of the vehicle. However, if you need to reset the PATS system due to a fault or issue, you can try the following steps:
Insert the first programmed key into the ignition and turn it to the "on" position for at least 3 seconds, then turn it off and remove the key.
Repeat step 1 with the second programmed key.
Insert the new, unprogrammed key into the ignition and turn it to the "on" position for at least 6 seconds. The security light on the dashboard should stop flashing and remain on for at least 3 seconds.
Turn the key to the "off" position and remove it from the ignition.
Insert the new key again and start the vehicle. If the engine starts and runs normally, the PATS system has been reset.
If this process does not work or you continue to have issues with the PATS system, it is recommended to have a qualified Ford mechanic or dealership diagnose and repair the issue. Disabling the PATS system can compromise the security of your vehicle and may also cause other electrical issues.
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Thursday, October 8th, 2015 AT 12:02 PM
