To troubleshoot a non-functional cruise control, you should:
1. Consult your owner's manual: This is the best place to start. It will list all the fuses and their associated circuits. Look for fuses related to the BCM (Body Control Module) or ignition circuits, as the cruise control is tied into these.
2. Check the fuses related to the BCM and ignition: Carefully inspect these fuses with a test light or multimeter, replacing any that are blown. Remember to turn off the ignition before checking fuses.
3. Have the system professionally diagnosed: If checking the fuses doesn't solve the problem, you'll likely need a mechanic or auto electrician to use diagnostic tools to pinpoint the fault. The problem could be a wiring issue, a faulty cruise control module, or a problem with the steering wheel controls.
Simply replacing fuses randomly is not recommended. Misidentifying and replacing incorrect fuses can cause further damage.