35th Anniversary Thunderbird Registry

Keyless Entry Factory Code

The factory keyless entry code for your vehicle was placed on a small decal or sticker on your passenger side trunk lid hinge, the keyless module itself whick is located inside the drivers side rear quarter behind the carpet liner and inside a black tray that is attached to the inner quarter panel, and the warranty card you got with the car when new. If you still have these, it may be a good idea to remove or cover the sticker from your trunk hinge if it is still there to prevent anyone from viewing your factory code without your knowledge.
Some dealerships have been known to be able to connect to your computer and retrieve these codes as well, for a small fee.

The following information has been verified with my 1990 35th Anniversary Thunderbird as well as two other SuperCoupes.
This information can be helpful to you if:

1. You have lost or otherwise are not sure of the factory code......or
2. You may want to change the factory code yourself if you have the knowledge and tools to do so.
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IMPORTANT NOTE:
The connections to the keyless module are hot with the key off. For safety sake, you may wish to disconnect the battery before you perform the procedure mentioned below. Disconnect the negative (black) cable first, then the positive (red) cable. To reconnect the battery, connect the positive (red) cable first, then the negaitve (black) cable. This will also clear codes and memory for your radio and EEC. Your vehicle will have to "relearn" it's idle and such so don't be alarmed if it isn't running smoothly for a few miles. You will also have to reprogram your radio stations.

The factory keyless entry codes are determined by the configuration of five resistors, hardwired into each car's keyless entry computer module. The module is mounted on a black package tray, which can be located in the trunk compartment, behind the carpet liner on the driver's side rear quarter panel inner wall. Once you have pulled away the carpet liner, you will see the package tray mounted vertically and fastened to the inner wall by two round pull clips at the rear of the tray, with the front of the tray having a tab which slips into an opening in the inner wall. To remove the keyless entry module, pull to unlatch the two round clips at the rear of the tray and then carefully pull the tray back towards you until the tab has cleared it's retaining slot. You can now pull the tray away from the inner wall far enough to flip it over, exposing the keyless entry module and several other components as well. The keyless entry module is a black rectangular plastic box with two connectors plugged into it and is held in place towards the front of the tray by three plastic holders that are part of the tray. With your finger or thumb, gently push the holders away from the module and they will release the module. It doesn't take much pressure to get the clips to release the module. Using a small flat blade screwdriver, gently pry the locking clips on the connectors up and the connectors can then be pulled away from the module. Care should be taken when removing the connectors so their locking clips are not accidentally broken off. Only pry up as far as is necessary to clear the tab they clip over. When pulling the connector from the module, grip the connector itself, not the wires, and pull straight away from the module with a slight side to side wiggling motion. The two connectors are made so that you cannot inadvertently swap them when you reinstall the module. When reinstalling the connectors, push them straight onto the module until the lock clip snaps into place, then gently snap the module back onto the component tray.

To disassemble the module, carefully insert a feeler gauge between the module's end cap and case wall, at the point where the clips retain the housing's end cap. You need to gently pry the outer wall of the housing up and away from the clips and gently pull that side of the module's end cap just to the point where the clips have released, turn the module over and repeat the procedure for the other two remaining retaining clips. You could also use a thin knife blade or screwdriver to accomplish this if your careful not to allow the blade to slip off the module and into your steering hand. With the lock tabs free, the end cap will pull away and the two circuit board sections where the connectors plug onto the module will remain within the case of the module. These two circuit boards are connected to each by a ribbon cable and two white plastic shafts that clip through holes on each of the circuit boards. Gently pull the circuit boards out of their retaining grooves within the housing, pulling on each one a little bit at a time. Note: They must be slipped out of the housing together. Once the boards are free, you will need to separate them by squeezing the spear like tabs at one end of each white plastic stand off which holds them together. You can then separate the boards by opening them like a book, hinging on the ribbon cable. Look at the circuit board that has the round red electrical component soldered to the board and nearby you will see a series of five resistors with long connections soldered next to each other. These are the "hardwired" components that "set" the factory keyless entry code. The particular connections of the resistors are what determines the factory code for your keyless entry keypad. You will find five resistors and not ten because Ford used five "signals" to correspond to the ten numbers 0 through 9. The numbers are set in pairs, meaning 1/2 is one connection, 3/4 is another, 5/6 is another, 7/8 is another, and 9/0 is another. If the two numbers, 5 and 6, are together in a code, then you just push that button marked 5/6 two times. The numbers may be different for you but the computer only knows that signal is coming from that connection twice. The diagram below (not to scale) shows the arrangement of the resistors. The connections are not marked with the numbers but the diagram is labeled for you to know which connections correspond to what numbers.


To add an additional personal code if you desire, just enter the factory code, then within 5 seconds press the 1/2 button, then enter your new additional code, then wait five or more seconds. Your new code should work. To remove any non-factory codes, enter the factory code, wait until the keypad light goes out and it's gone.
At any time without entering a code, pressing 7/8 and 9/0 at the same time will lock all doors. After entering a working code, if you press 3/4 within 5 seconds, you will unlock the passenger door. If within 5 seconds you press 5/6, you will unlock the trunk.

(diagram: courtesy of Ed Wick.)

I hope this information is helpful to you if you don't know the code of your car or a car you have purchased.
For those of you who wish to change your vehicle's Keyless Entry Code, it is recommended that you obtain a second module to experiment with. New units are available from Ford, or, you can most likely save time and money by finding another one used from an individual or an auto dismantler. To change the code, you only need the control module and not the door keypad assembly. This way, if you should decide to rearrange the hardwiring by de-soldering and then re-positioning the resistors and obtain your own preferred code sequence, you can "experiment" or learn on the second module. Then, after your successful modifications are performed, simply plug it in and try your new code. Please be sure your only set of keys are not locked inside the vehicle should the new code fail to work. Also, by working with a second module, your vehicle will remain operational while you modify the second unit and you can store the original unit away for future use or re-installation if you should desire.
 
My sincerest thanks to Ed Wick for his contributions to the Registry for this article. It's much appreciated.
Disclaimer: This article is for personal use only and for assisting owners in maintaining their vehicle. No publishing or reprinting is allowed unless by permission by the author of this article. The author is not responsible for any damage that occurs from the use of this information.