There is no response when the cruise control button of the truck is pressed

The cruise control of my car cannot be used, that is, the cruise control switch can be turned on, and then the button of the constant speed has no effect after pressing it! I have replaced the steering wheel on the car and it is normal. The test buttons on the computer work normally, but the speed cannot be determined.

 

fuse checked out fine, but the relay did not!

 

I did it for about a second, and the speed didn't respond! Check the button on your computer is working!

 

The vehicle has gone out, we need to wait for the relay replacement of another vehicle to check the result after coming back!

 

2018 freightliner cascadia