open tailgate; right hand top corner---pull the rubber boot carefully out of the car body, as you look inside it you will find wires that the insulation is cracking!! theres bound to be one thats snapped, all i do is find a piece of wire the same size (and colour as i am fussy) and repair the wire and extend it a few inches at the same time. the problem is there are so many wires going through the rubber boot that they trap each other and snap. next time mine go i am goingto halve the amount of wires in the rubber boot and extend some so that they pass through the passenger side boot along with the screenwash pipes. admittedly more wiring to install but hopefully i will spend less time doing gynacologist repairs inside the drivers side rubber boot !! Thanks for this.. you are 100% correct. 1 snapped and 3 will snap very soon as the plastic coating has gone. I've fixed the snapped one and and I'll do the rest next weekend