To troubleshoot, you should:
1. Check the owner's manual: Your owner's manual should list all the fuses and their corresponding circuits. Look for fuses related to power distribution, body control modules, or possibly even the instrument panel. While there's no specific "cruise control" fuse, a blown fuse in one of these related circuits *could* affect cruise control operation.
2. Inspect all fuses carefully: Don't just look for a blown fuse; check for any that are loose or show signs of corrosion.
3. Have the system diagnosed: The best approach is to take your car to a qualified mechanic or auto electrician. They have the tools and expertise to diagnose the problem accurately, whether it's a fuse, a faulty switch, a wiring problem, or a more serious issue within the cruise control system itself. A simple code reader might not find the problem, and visual inspection might miss a subtle wiring issue.