I fitted some new steering wheel control butons yesterday, however, the left buttons no longer work and the right buttons only work if you press quite hard. I fitted the old buttons back and now they are just the same...Anybody any idea why the buttons no longer work?...they are connected up ok because when i turn the lights on they light up.

I could just use the controls on the radio itself...but boy having to stretch over to adjust volume etc can be quite a chore....