Check Setting and click Auto Detect. After auto-detection starts, press steering wheel control buttons one by one. After all the buttons are detected, click Auto Detect again to finish auto-detection.
Clear button clears all the buttons detected. You can tune the Resistor Range and Position manually by putting the values in the edit boxes. Click Save/Apply after you change the values.
If the button bars are too close each other, tune the Adjustment A/B on the Board.
(Resistor range and position of the buttons are stored in the onboard memory of CarPC JoyCon Exr.)

Button bar turns to green when the controller button is pressed.