Faulty ABS on C4. ABS/ESP wiring, CAN-BUS wiring diagrams request

[dunno15]

Hello I own a Citroen C4 1.6 VTi year 2009 and I'm trying to fix my faulty ABS. I'm getting the C1381 Recirculation pump supply faulty. But the thing is that when I directly actuate it via the ABS module through diagnostics it is working and I can hear it and no errors are found after clearing the error code and trying it again and again. Tried checking the fuel pump/ABS relay thats located on the plastic cover of the engine bay fusebox/BSM and it is giving the proper power, no shorts or any issues there... The error comes back after clearing it after the next start of the vehicle with the ABS/ESP system faulty error with the beep and STOP warning on the car display and the ABS not working properly. So I am asking if anyone could please provide me the ABS/ESP wiring, CAN-BUS wiring diagrams so I can check it more profoundly. The vehicle VIN is VF7**************[VIN obfuscated, can be read by forum staff]. If you have any ideas feel free to tell me

[wheeler]

I am currently away from home this week so cant access wiring diagrams just now.
However if there was an issue with the H/S CAN I would expect the engine would not start. If you unplug the ABS/ESP ecu this breaks the H/S CAN circuit & the engine will not start.
Have you had the connector off the ABS module to check for any signs of water ingress? This was well known on C4's & there were lots of modifications to the ABS systems done on the early models to try to stop water ingress.

[dunno15]

I have not. I will check it this Saturday. Thanks for the tip.

[wheeler]

ESP diagram (well part of of it) doesn't zoom very well
CAN lines are 15 & 27 + 14 & 26