Naval one steering remote help needed.
 

Hi I have just fitted a naval unit to my car. I have used the loom that came with it that replaced the loom in the car but I cannot get the steering wheel controls to work. I've watched the YouTube video. But nothing happens when I press any of the buttons. Am I missing some wiring. The wire I can see that I have not connected is a blue wire that says brake. Any help would be most welcome.