If you have a problem with the lighting in your steering wheel controls (horn, cruise control, audio controls, etc.), you'll need to:
1. Diagnose the problem: Is it completely dark, intermittently flashing, or dimly lit? This can help determine the issue. A completely dead light suggests a blown fuse, a wiring problem, or a faulty control module. Flickering might indicate a loose connection.
2. Check fuses: Consult your owner's manual to locate the fuse(s) related to the steering wheel controls and check them for continuity. Replace any blown fuses.
3. Take it to a professional: If the problem persists after checking the fuses, the issue likely lies within the steering wheel control module itself. This is a complex component that requires specialized tools and knowledge to diagnose and repair (or replace). Taking your Fusion to a Ford dealership or a qualified auto electrician is the best option. Attempting repairs yourself could potentially damage the steering wheel or airbag system, which is dangerous.