To find the relevant modules, you'll need to:
1. Consult a wiring diagram: A wiring diagram specific to your 2004 Ford Explorer Sport Trac will show the location of the BCM and PCM. These diagrams are available online (sometimes for purchase) from sources like Ford's official service manuals, or aftermarket repair manual providers such as Haynes or Chilton.
2. Locate the BCM and PCM: Once you have the diagram, it will pinpoint the location of these modules. They are usually under the dashboard, sometimes under the hood, or even in the center console. The BCM is more likely to control the anti-theft functions.
3. Inspect the modules: The modules themselves are usually marked with their function.
In short: There's no single "RAP module." The anti-theft functions are distributed across various modules, most importantly the Body Control Module (BCM). You need a wiring diagram to locate the BCM and potentially the PCM in your specific vehicle.