2016 C4 Picasso Abs, esp, parking brake and tyre inflation monitor faults showing

[GiveMeABreak]

Here you go:

7825 is the rear right Wheel Sensor.
7800 is the ESP ECU

7032 is the Right Hand Rear Wheel Speed Signal Reference on Pin 1 going to Pin 37 of the ECU via the harness interconnections.
7031 Right Hand Rear Wheel Speed Signal on Pin 2 going to pin 22 of the ECU via the harness interconnections.

These go back to the ESP ECU via the 80 AR SP main harness and the ICK5D interconnection.

Main Wiring Diagram



Close up of Rear Right Wheel Sensor



Wiring Harness 80 AR SP



The wheel sensor wiring then connects with ICK5D under the rear seats as shown:



Here is the 4 pin ICK5D connector showing the wheel speed sensor pins in the interconnection: It should be a black 4 pin connector (not 6 pin as shown on the diagram - but can't be sure - you know the French!)

[tomaskriv]

Thanks.

[tomaskriv]

Will try to get my hands there as soon as possible. When ignition on, should I see any voltage on abs sensor pins? Or sensor sends signal to the ecu?

[GiveMeABreak]

There are 2 types of rear wheel speed sensor according to options (semi automatic parking) but pin 1 contains the sensor supply and pin 2 contains the data stream.

[tomaskriv]

Will check at the sensor if I have anything on pin1. If not then will check under the seat connection.
Just hope it will be easy to gain access to that connector..

[tomaskriv]

Marc,
Stupid question:
Ive removed front left wheelarch. Cant see abs unit... Where is this ting located?

[GiveMeABreak]

That's because it's not under the front left wheel arch - it's under the front right wheel arch on this model.

[tomaskriv]

OK. Thank you. Checked wires from rear sensor as far as I was able to reach. Looks Ok. Next step to disconnect them from ABS unit and check with multimeter.

[tomaskriv]

Fron right wheel arch removed. No pump...Well I do have idea what to look for. Cant see it here.....

[GiveMeABreak]

There's a guide I've put up in the member's resources section Tomas:

C4 Picasso MK II (B78) ABS / ESP Module Removal - Refitting

[tomaskriv]

Sorry but I am not authorised to see this forum...

[GiveMeABreak]

Access to information in the Resources Section and live PSA parts info requests require members to have made a contribution to the Forum Tomas. Details below:

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[tomaskriv]

Case closed.
Checked continuity from connector under the seat to sensor - yellow wire dead. One new wire later all good now.
Thank you Marc for wiring diagram and harnes location.
Now only aditive reset left and car will be trouble free.

[GiveMeABreak]

You are welcome, well done on sticking with it. The wiring on these vehicles is legendary!

[garddian]

Hi GiveMeABreak, I dont suppose you have a legend for the other items on this Main Wiring Diagram please.