cruise control not working

[lufkin]

hi guys, my car was recently converted to manual and cruise control is not working, if you press the button it will turn on, but wont go active, any ideas what this could be, could it be the car isn't recognizing its over 40km/h, if so is there a way around it? its a WH statesman
Thanks

PS already checked break lights

 

[FXST01]

Couple of flowcharts to get you going.

Follow the bouncing ball young fella.