Citroen C4 Grand Picasso 2015 MK2 Brake Fault

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jm96
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Citroen C4 Grand Picasso 2015 MK2 Brake Fault

Post by jm96 »

Hi All,

I recently changed my brake pads on my C4. It has an electric hand brake so I had to use a diagnostic machine to release the callipers.

Unfortunately a few weeks after I have got a braking fault which has disabled my handbrake (meaning I can not engage it anymore). It is coming up with parking brake fault stop vehicle in the dashboard. So the handbrake no longer works when I move the button up or down.

I have read on a few places if you leave the ignition on whilst changing the brake pads it causes a fault on the braking system. I unfortunately forgot to turn the ignition off after releasing the handbrake.

I have plugged it onto a diagnostic machine and have come up with the following codes:

C156C(92) Electric parking brake (FSE) actuator sensors
C1561(00) Electric parking brake (FSE) right hand actuator

Has this happened to anyone before and is there a way of fixing this instead of taking it to the dealers!

I appreciate your responses.

Thanks,

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GiveMeABreak
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Re: Citroen C4 Grand Picasso 2015 MK2 Brake Fault

Post by GiveMeABreak »

A mistake others also make. Once the system is put into service mode, the battery should be disconnected, then the reconnection procedure for the battery and the handbrake system followed.

C156C92: Electric parking brake (FSE) actuator sensors: Short circuit to positive or short circuit to earth or open circuit. So either there is a short circuit between the LH and the RH line of the motorised brake calipers or the line supplying the LH or the RH motorised brake caliper is in open circuit (Sensor disconnected).

C156100: Is more specifically related to the Right Hand motorised brake caliper and signifies again either a short circuit to earth, positive or an open circuit.

Try switching the ignition on for 5 seconds, then activate the electronic switch to APPLY the parking break for 5 seconds. If it does not engage you may need to take the plunge and get it to the dealer to sort.

Djmorgan21547739
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Re: Citroen C4 Grand Picasso 2015 MK2 Brake Fault

Post by Djmorgan21547739 »

Hi Marc, I have the first fault C156c92 fse .
I was wondering a: where did you get that explanation from? ( I can't seem to find a workshop manual anywhere for this car!)
And b: are you able to ho into anymore detail ie am I looking for a rubbed wire/ faulty caliper motor?
Kind regards DJ

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GiveMeABreak
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Re: Citroen C4 Grand Picasso 2015 MK2 Brake Fault

Post by GiveMeABreak »

There is a technical service bulletin if you are getting an ESP or FSE warning lamp on with the "Brakes Fault" message, and one or more of the following fault codes:
C156C92, C00372F, C003712, C003711, C003701, C003762, C003A2F, C003A12, C003A11, C003A01, C003A62, C003811, C003B11.

If you are getting fault C156C92, then you need to check the continuity and insulation of the electrical harness between the ESP unit and the rear right and left brake caliper actuators.

You will need a special adaptor harness to do this and before doing so, the battery, ESP ECU, wheel sensors and rear motorised brake caliper actuators must be electrically disconnected.

So as this is a bit of a faff, you may want to get it booked in if you are having the warning message and this specific C156C92 fault code.
image_2020-10-19_112535.png
One of the specific problematic areas is on the rear intermediate electrical harness (1) in the area of the rear wheel arch on the side concerned, once you've released the wires from the spiral sleeve.

If they detect a problem with the wiring, then they will need to locate the issue which is likely to be a break in the wire somewhere.

If they have to replace the rear intermediate harness, it will be anywhere from 3.4 to 4.0 hours to do depending on your engine.

Djmorgan21547739
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Re: Citroen C4 Grand Picasso 2015 MK2 Brake Fault

Post by Djmorgan21547739 »

Hi Marc thank you so much for this information!. I had a quick look today and tracked the wiring harness to its different positions, it looks very exposed and looks in fairly poor condition. I've not had chance yet to strip it apart and look properly but this is z massive help thank you!
Can I ask is this information easy for me to obtain? Or is it main dealer information only?

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GiveMeABreak
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Re: Citroen C4 Grand Picasso 2015 MK2 Brake Fault

Post by GiveMeABreak »

No problems, it's main dealer info - chargeable, but I'm just sharing it with you as it looks relevant to your issue.

Djmorgan21547739
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Re: Citroen C4 Grand Picasso 2015 MK2 Brake Fault

Post by Djmorgan21547739 »

Okk so a little update, I found two corroded wires on the drivers side rear. I have soldered and heat shrieked the wires. Reset the fault codes using the code reader and re assembled.
Marc your an absolute hero for sending me in that direction! Thank you thank you thank you!
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