Parking assistance system fault (wiring schematics)

[C5X7_2_2HDI]

Hello everyone

Long story short the parking assistance system doesn't work on my recently purchased C5 X7.
I scanned the system with diagbox and got 11 errors on parking system.
Basically everything that there could be wrong, is.
After deleting errors, the error "BBDB - Sensors supply fault" could not be erased (other errors soon followed after restarting the car).
Which led me to inspect the fuse nr. 14 (15 A - which protects the parking system from overcurrent and short circuit) which was ok.
Just in case I switched it with another 15 A fuse, and the problem still persisted.
Then I got into the boot of my C5 where the module for parking assistance is located.
The further right connector is apparently for front sensors, the middle black connector is for the rear sesnosrs, and the left one is for the CAN bus connection.
The CAN bus connector is very suspicious as there was a zip tie around the wires (see the attached picture).

So now I would like to know if it is possible to get the wiring schematics for the parking system.
I would like to know where every wire goes so I can check each one for continuity.

My VIN is VF7**************[VIN obfuscated, can be read by forum staff], if Marc would be so kind and check if my car came with both front and rear parking sensors.

I would very much appreciate any input on the problem, if anyone has experienced something similar (common power supply failure points etc..)

Cheers!

[GiveMeABreak]

No problems, here you go: but with all those faults the supply seems to be the issue, so whether there has been impact damage or the ECU is fried, I can't say, but check the wiring and earths.

PA ECU

7500 is your Parking Assistance ECU



Some Further Detail:

9024I : comfort data high CAN bus
9025I : comfort data low CAN bus
Z14F : CAN+ supply
Z14G : CAN+ supply
M750 : earth

[C5X7_2_2HDI]

Well, I have now diagnosed my parking assistance system, but still no luck.
First, off I checked for continuity of all the wires from BSI to the parking module (both CAN bus supply, both CAN data lines, and both grounds), and all of them were OK.
I then checked the local ground point, where the module is connected, and measured the resistance to the negative battery terminal and it was a couple of mili-ohms, which is OK.
I then measured the supply voltage from the BSI to the module via CAN supply lines and both were 10,5V which is oddly low, as I think it should be around 12V.
I also measured CAN bus data lines to check for voltage and there was some voltage flickering, which means there is some data being transferred via CAN data lines.
I then measured the output voltage from the module to the sensors and there was NO voltage present on the output.
Than I proceeded to order a used working module, but still NO luck.
With an identical parking module (I checked for correct serial numbers) the error still persists.

So now I am stuck as I don't see any solution to this problem...
I was thinking are there maybe any additional menus where you can configure the parking assistance system in the diagbox software?
I know this is all a long shot, but if there are any suggestions I will very much appreciate them.

Cheers!

[GiveMeABreak]

To do that, you'll need to run global test first (on version 7.57 or earlier), then select the parking assistance ECU from the list of detected ECUs after the test. Then select this and from the following menus, you should have a screen for manual configuration. Select the appropriate option for your vehicle and make sure you don't select Parking space GAP measurement unless you have that system fitted.