1) Wiring Connections: Double-check the wiring connections between the steering wheel and the main vehicle harness. Ensure they are secure and free of any corrosion.
2) Steering Wheel Switch Assembly: The problem might be with the steering wheel switch assembly itself. This assembly houses the buttons and controls for the horn, cruise control, radio, and temp. If the assembly is faulty, it may not be providing proper electrical contact to activate these functions.
3) Multi-Function Switch (MFS) Module: The MFS module is responsible for managing the signals from the steering wheel controls and sending them to the appropriate systems in the vehicle. If the MFS module is faulty or damaged, it could cause the steering wheel controls to malfunction.
4) Vehicle Computer: In some cases, the issue could be with the vehicle's computer or its programming. If the computer does not receive the appropriate signals from the MFS module or the steering wheel switch assembly, it may not activate the horn, cruise control, radio, or temp functions.
Troubleshooting these types of issues can be challenging, and it may require specialized diagnostic equipment and knowledge. If you have limited experience with electrical and electronic troubleshooting, it's recommended to consult with a professional mechanic or auto electrician who can accurately identify and fix the root cause of the problem.
