I think I have discovered why my front PDC sensors aren't working. The right hand side outer one is disconnected as all 3 wires are detached from the connector.
I don't have enough slack to try and solder them straight on the pins but I could possibly try and twist some wires in an effort to ascertain whether or not the rest of them are working (and have a functional system of 3)Before trying it though, would such thing even be possible?
Thanks in advance.

Last edited by vs322 on 23rd Apr 2022 4:52pm. Edited 1 time in total

Well, scrap this.

With huge effort I was able to catch the dangling piece of wiring and pull it upwards over the horns and through the side light cluster space just enough to half-decently splice on some extensions. I twisted and squeezed their free ends through the old connector plug terminals and got the sensor working on the first go!
Now you didn't think it would be that easy, right? Turns out this is the only working front sensor! The other 3 seem dead. I can't swap them out without cutting and splicing as someone else has soldered them on the loom straight. So this is potentially a bumper off job...
On a positive note, I was able to fix some botches on the fog light mountings so all this wasn't a total waste of time. Next step would be to source three or four good sensors from Ebay with their connectors and give it another shot with the soldering gun and heatshrink before biting the bullet and taking off the bumper...

Had a look at the wiring diagram. It seems that the sensors are individually wired to the PDC ECU, which should have occurred to me earlier, thinking of aftermarket solutions and the way sensors plug into their units...
So unless the loom is totally cut, somewhere along the bumper, to the left of the working sensor, then it could be 3 bad sensors (possible but remote) or 3 wrongly soldered sensors (likely)... Before purchasing anything or taking the bumper off, I'll pop those three sensors out and check the colour coding against the diagram. I wouldn't be surprised if someone has mixed up the wires; it won't be the first cock-up I'm discovering on the fatty...