To find it, you'll need to:
1. Consult a wiring diagram: A wiring diagram for your specific year, make, and model Sport Trac will show the location of the relevant module. These can sometimes be found online (through sites like Haynes or Chilton manuals) or obtained from a Ford dealership.
2. Carefully remove the passenger-side kick panel: This usually involves removing screws and possibly some clips. Be gentle to avoid breaking anything.
3. Inspect the area thoroughly: Once the kick panel is removed, look for a module with connectors that match the description and function of the 4x4 system. It may be labeled, but it may not be easily identifiable without the wiring diagram. You might find several modules in this area – you need to use the wiring diagram to find the correct one.
4. Trace wires: If you can't visually identify the module, try tracing wires from the transfer case (located under the vehicle) or the 4x4 related switches inside the cabin to see where they lead.
Important Note: Working on your vehicle's electrical system can be dangerous. If you're not comfortable working with automotive electronics, it's best to take your vehicle to a qualified mechanic for diagnosis and repair.