You can not change the master code yourseft. Only the dealer can.
If you want to change the FACTORY code a new anti-theft control module or RAP module would have to be installed and you would have to get new remotes to go with the change
Under the dash
The factory keyless entry code can't be erased because you have to enter that code to make any changes to your personal code etc . The only way I can think of changing the factory code is to change the RAP module in the wheel jack storage compartment in your cargo area ( I'm not a mechanic / technician - just a guess )
first u need to know the original key code.. if u do not have it, u can go to a service center and they can put yer car on the computer and that wil tell them the factory code. once u have that then u will be able to change the code to anything u want..
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I assume that you are reffering to the Powertrain Control Module (12A650). This is located on the firewall down from the passenger side windshield wiper. You can see the 104 pin connector comming out of it. I think I need the location of the chassis computer. I bought the car used and it has the keyless entry number pad on the drivers door. The manual says that if I know the factory code I can use it to open the doors, or I can change the code. I have no idea what code is in the computer, but the manual says the factory code is taped to the "computer module". Any Help on where this module is located?
Change clock on 99 expedition
Simple just type in the factory 5 digit code, then press number 2, then type in your new 5 digit code. You are done
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