RE: Door Keypad Code
Several years ago, I saw online at a Taurus SHO site, instructions for changing the factory code for the keyless entry and among the instructions were details to find the original code.
Not sure if this would still work on the latter model FoMoCo cars but it might be worth a try. Especially if it will save you $100 and only want to find out the factory code..
Changing Keyless Entry Factory Code
It used to bug me that I had to reprogram my SHO's keyless entry code every time I got the car back from the shop. This is annoying because I don't remember the factory code, and I never remember how to reprogram the darn thing. So, I decided to change the factory code to my personal code.
NOTE: This procedure was done on a 92 SHO, but it probably works on any Ford with keyless entry. And, undertake this procedure at your own risk. It worked on my car, but that is no guarantee that it will work on yours. Also, you need to be able to solder to complete the procedure. If you can't solder then find someone who is competent at soldering to do the work for you. Finally, you should ground yourself with an ESD strap or other means while handling the printed circuit boards to avoid any electrostatic discharge damage to the board. I doubt that anything of the board is static sensitive, but its always a good precaution.
Items required:
A phillips screwdriver.
Five 5.1K 1/4 watt through hole resistors.
Solder Iron.
Solder flux and solder.
The first thing you need to do is remove the keyless entry control box. (I'm told the official name is the Illuminated Entry Actuator/Electronic Doorlock Control Processor, but that is too long to type.) This is located in the trunk of the SHO on the left side of the back wall.
http://homepage.mac.com/paulchristenson/filechute/Keyless-1.jpg
There are only two screws holding the box to the trunk, so it is pretty simple to remove.
Next, disconnect the two wire connectors from the control box.
NOTE: Your electric locks won't work without this box installed, so be sure to manually lock your doors if you go anywhere before you get the box reinstalled.
Now that you have the box removed, you can remove the circuit cards. Just flip down the side of the box and the cards should slide out easily.
http://homepage.mac.com/paulchristenson/filechute/Keyless-2.jpg
There are two cards inside the box, and they are attached with a ribbon cable. You need to work on the lower card, so bend the top card to gain access to the lower card. (Don't worry, the ribbon cable is flexible.)
http://homepage.mac.com/paulchristenson/filechute/Keyless-3.jpg
If you hold the cards with the edge connector of the lower card to the right, you will see the IC (big rectangular black thing) at the bottom of the card. Directly above this IC on the right side are five horizontal resistors. They are what determines the factory code.
http://homepage.mac.com/paulchristenson/filechute/Keyless-4.jpg
The top resistor determines the first number, and each successive number is determined by the next resistor down, so the last number is determined by the resistor closest to the IC. Here is how the resistors determine the code. On the right side of the resistors are five possible solder points. The solder point closest to the right of the card is for number 1/2 the next one to the left is for 3/4, then 5/6, 7/8 and finally 9/0. Below is a example drawing with a factory code of 31936.
http://homepage.mac.com/paulchristenson/filechute/Keyless-5.jpg
So, if you want your first number to be 1/2 you need to solder the top resistor in the far right solder point (always leave the left side where it is.) If you want it to be 3/4 you would solder the right side of the top resistor to the second solder point from the right and so on. This is true for each resistor for each number. All you need to do is remove the five resistors and solder new ones in the correct solder points for your personal code.
Once you have the resistors replaced put the cards back in the box and plug in the connectors to check out your new factory code. If it doesn't work, you probably have a cold solder joint. Just resolder your resistors. Be sure to use electric solder flux for a good solder joint. Also, it is a good idea to clean the wire connector contact points with a pencil eraser. This will remove any oxidation which can lead to intermittent operation.