Help please Parking aid issues.

So where to start, I have had an intermittent problem with my cameras and parking sensors not working for a while. Now they don’t work at all. I’ve been trying to diagnose the issue and had no joy.
I have an icar soft obd and I’m getting the faults with every sensor all codes B129c front left side sensor as an example. I try to clear codes and it changes to b1d58 rear sensor power circuit and another for front. My live date for my sensors shows my rears working apart from rear left which isn’t even an option and front have distance of 2.55mm. I have carried out continuity tests on all my harnesses and all good. I’ve also had a multimeter on all sensors and all showing virtually the same readings about 40. I took a guess at parking aid monitor as cant see how all sensors could be faulty but had no joy unless the used Pam is also faulty. When I disconnect my front bumper I can actually clear all faults however still have no cameras. As soon as I select reverse or re connect front fault is back and I get an audible warning like a parking sensor too close. So I guess it must be something to do with front. Sorry this is long winded but I’m out of ideas and I’m not one to go to dealer to sort. Would rather do it myself. Any ideas would be greatly appreciated. Thanks. Also just tried front sensors out of a 2014 Evoque that look the same and initially no warning beep when switched the car on. Checked cameras and all working then selected reverse and everything back to square one. No cameras or sensors.

Hi again, anyone got any ideas?

Learn to drive?

lol not very helpful but thanks.

Might help if you specify what model, year, etc.

But I agree, everyone on the planet should be able to park a car without beeping aids !!

Hi sorry it’s a l405 2013. And yes I can park but park every day in a busy car park with very short bays. So have to get extremely close to the car behind. It’s not really about being able to park it’s about something is not working and I want to fix it.

My understanding that for an L405 you need to use Topix to get access to wiring diagrams, etc. But if thye were intermittent, check & clean all the connectors. The nork that designed it probably programmed it to shutdown just because one tiddly component isn't working . . . . . to generate £££ for the stealers.

Yes had both bumpers off cleaned everything but no joy. Harnesses from Pam to all sensors good. All sensors seem to be good. Swapped parking aid module with used one and no change. Hoping someone had the same issue and resolved it. Have now found a wiring diagram but still can’t find it. Electrics isnt my strong point.

Get a known good sensor and swap it out with the rears, one at a time - you don't need to re-mount the bumper cover to test, just have it connected and put the vehicle in reverse.
When you say a 'reading of 40' 40 what?

Thanks for your input. Resistance of 40 ohms all sensors read the same. Swapped sensors over from my Evoque which are good look identical but different part numbers. Have exactly the same readings as my vogue sensors. The rear left sensor which isn’t showing on my live data has been swapped with the right one and still no sign of rear left sensor but no fault code either.

Pablo63 said:

Hi sorry it’s a l405 2013. And yes I can park but park every day in a busy car park with very short bays. So have to get extremely close to the car behind. It’s not really about being able to park it’s about something is not working and I want to fix it.

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Land Rover owners have a saying: My crumple zone is your car

Why are you testing resistance? on which pins? that is not a valid test for parking sensors on any test plan. Despite checking wiring, you could have poor pin grip, corrosion, volt drop in the harness or any combination of the above and more besides.
Clearly you need to start with the rear left sensor as there is no live data - find out why and you'll be on the way to fully diagnosing the fault. You should only be testing voltage, not resistance - 'resistance is futile' without a load applied, and you won't be able to measure resistance on a live circuit.

sorry I have voltage and earth on each sensor including rear left. And as I said electrics aren’t my thing. Don’t know how to test signal. I was checking resistance on pins to see if any of the sensors had different readings to possibly find an issue.