Making some progress on the arduino code.
Here is a summary of the code :
Button Press: If the button is pressed, the servo motor angle is adjusted based on the current angle (0, 45, 90 degrees).
Position Switch: Reads the state of the position switch and displays a message on the LCD indicating whether the grille shutter is shut (0), half-open (45), or fully open (90).
Position Error Detection: Reads the state of the position error switch and displays an error message on the LCD if the position is between certain angles and the error switch is triggered
Fully manual for the time being. Sensor integration (coolant and ambient temperatures) will be done after the grille shutter has been installed on the car.