Parking Sensors- Wiring?

[ianandrachel]

Hi,

Got a problem with my 2005 Alhambra- one of the front parking sensors is not working. I found out which one by listening for the clicks and vag com confirmed it was the middle right. No problem,I thought,and ordered a new sensor. Which also doesn't work when fitted.

I then fitted a known good sensor- still not working. The wiring plug has Earth and postive going to it- nothing at the middle purple wire though which I assume is the signal wire so should show nothing?

 

So is this likely to be a wiring fault or a problem at the module? Vagcom only shows a sensor fault. There is no obvious break in the wires anywhere.