C003A + C0037 Citroen C4 Grand picasso

[noworries2004]

Hi My Citroen C4 Grand Picasso Exclusive plus is putting up loads of faults. NO electronic hand brake/ ABS faults ESP faults etc.
I have read the faults and teh following keep showing up - C0037 + C003A pointing to rear left and right ABS sensors.
I doubt 2 of them have failed but would like to check the wiring from the ECU.
Does anyone have the wiring diagram for 2014 GP exclusive plus?

Thanks

[dme88]

There is wiring diagrams to buy on eBay and similar sites. Both sensors in the rear sounds a bit much, but it is not impossible. Have you checked the sensors visually? One can also hook up a oscilloscope to the actual sensor, and turn the wheel (Done that, showed that a brand new sensor was faulty)

[noworries2004]

Thanks
Checked the sensors visually and they looked ok.
Didnt put an oscilloscope on them but will try it at the weekend maybe.

If i knew where these went to it would help. Do you know where the ABS ECU is in the engine bay?

[GiveMeABreak]

Ok, so just be aware that there was a Technical Service Bulletin for the C4 Picasso (B78) that specifically mentions these fault codes:

C156C92, C00372F, C003712, C003711, C003701, C003762, C003A2F, C003A12, C003A11, C003A01, C003A62, C003811, C003B11

I have detailed the fault on my post here and what is involved to check it:

viewtopic.php?p=660516#p660516

You can also see another member with the same problem and his photos of the corrosion that caused the wiring breaks / corrosion.

[noworries2004]

Finally got teh the root of thsi issue.

Corrosion + Crack in wire for Handbrake fault.
ABS faults on left and right.
Left ABS cabling above wheel hub had one crack in wiring and i fixed that and fault code was gone.
Right ABS cabling above wheel hub had 2 different cracks/corrosion on the wire. I fixed these by sniping and joining again.

Pictures and info from this post was very helpful.
viewtopic.php?p=660516#p660516

Thanks again

[GiveMeABreak]

No problems, glad you have fixed it and thanks for feeding back the update, as it helps others to see the outcome