Cruise control light on but wont set

2003 Toyota Matrix cruise control light comes on but will not set. Break lights work so think break switch is good. No DTC's. Speedometer works, not sure if speed controlle sensors controller speedometer. Don't want to change sensors randomly but still cheaper than diagnostics labor at garage which they would probably have to change sensors to solve too since no DTC'S. Is there an order of which you would change first? Are steering wheel column switches known to go bad on these? Any other recommendations?