C5 (X7) Electronic Parking Brake problem

[GiveMeABreak]

This procedure is usually only when the parking brake is removed or replaced though Mike, which Lenny has done. If you look at my previous post somewhere I mentioned the manual routine of holding the brake control up, but I will have a look to see if there is anything different on your Picasso once I have your VIN and any fault codes Mike.

[lenny1972]

Ok, sorry it has taken me a while to get these together, I've been a little busy today. All these codes have a common reference - ESP ECU. As I mentioned earlier this plays an integral role in the operation of the EPB. As you can see from the diagnostic tables below, lack of Automatic functions including Hill Start are common when there is a fault. Some of the other faults can be caused by the communication errors. Have you changed any parameters anywhere for anything else (however small or insignificant you may think they are? Have you changed anything not related to the parking brake? A small change can affect the vehicle if the parameter is not relevant to this model - as the BSI is shared across PSA vehicles.
No, I didn't change any parameter and I didn't replace any part/ECU

Looking at both the VIN numbers of your car and the donor car - none of these had directional lighting (Xenons), yet the diagnostic screen you have in the first picture indicated it is trying to communicate with the ECU - this should not happen. I suspect that the BSI has been configured incorrectly, because the BSI is looking for an ECU that it has been told is there, but is not. This tells me that the Head Unit and / or the multifunction screen has possibly been changed, since these have their own ECUs and they retain the parameters from the donor vehicles.

As far as I know no replacing activities on Head Unit and Multifunction screen has been done by anyone. In this ten years the only repairing activities on the car was done for:
- replacing an Hydraulic Suspension + the Suspension oil tank (that for some reason get broken)
- replacing the EPB with the part taken from the donor car

Fault Code	U2118
After sales description of the fault code	Fault in the reception of the partial triggering message by the built-in systems interface (BSI):Coherence
Description of the diagnostics	On a partial wake-up request, the frame is invalid or absent
Conditions of activation of the diagnostics	Ignition on
Conditions of disappearance of the fault	-
Down-grade modes if fault present	No back-up mode
Switching on of the warning lamp and/or warning message	Warning lamp - "a" : Not on - "b" : Not on - "c" : Not on
Main customer complaints likely	Switching on of the warning lamp and/or warning message Electrically-controlled parking brake does not apply correctly Electrically-controlled parking brake releases unexpectedly Electrically-controlled parking brake does not release correctly Electrically-controlled parking brake applies itself unexpectedly The hill start assist is not working
Suspect areas	Electric parking brake CAN network ESP (electronic stability control)

Fault Code	U1108
After sales description of the fault code	No communication with the engine management ECU fault: No signal
Description of the diagnostics	The engine management ECU is confirmed absent
Conditions of activation of the diagnostics	Ignition on
Conditions of disappearance of the fault	-
Down-grade modes if fault present	No back-up mode
Switching on of the warning lamp and/or warning message	Warning lamp - "a": Not on - "b": Not on - "c": Not on
Main customer complaints likely	Illumination of LED/Error message Electrically-controlled parking brake does not apply correctly Electrically-controlled parking brake releases unexpectedly Electrically-controlled parking brake does not release correctly Electrically-controlled parking brake applies itself unexpectedly The hill start assist is not working
Suspect areas	Engine ECU

Fault Code	U1213
After sales description of the fault code	Fault - absence of communication with the stability control (ESP) ECU: Value received incorrect
Description of the diagnostics	The ESP ECU sends out data that is invalid or information that is too short
Conditions of activation of the diagnostics	Ignition on
Conditions of disappearance of the fault	Reception of 3 consecutive items of valid information
Down-grade modes if fault present	Possibility 1 - Deactivation of automatic mode - Ignition on: The electrically controlled parking brake releases if the button is not held - Ignition off: The electrically controlled parking brake releases if you hold the button for less than 3 seconds Possibility 2 - Deactivation of the hill start assistance - Dynamic braking by the electric parking brake
Switching on of the warning lamp and/or warning message	Warning lamp - "a" : lit - "b" : lit - "c" : lit
Main customer complaints likely	Illumination of LED/Error message Electrically-controlled parking brake does not apply correctly Electrically-controlled parking brake releases unexpectedly Electrically-controlled parking brake does not release correctly Electrically-controlled parking brake applies itself unexpectedly The hill start assist is not working
Suspect areas	Brake pedal switch Electronic stability control (ESP)

Fault Code	U1118
After sales description of the fault code	Fault: absence of communication with the Built-in Systems Interface (BSI) : No signal
Description of the diagnostics	The BSI is detected absent
Conditions of activation of the diagnostics	Ignition on
Conditions of disappearance of the fault	-
Down-grade modes if fault present	No back-up mode
Switching on of the warning lamp and/or warning message	Warning lamp;- "a" : Not on;- "b" : Not on;- "c" : Not on
Main customer complaints likely	Illumination of LED/Error message Electrically-controlled parking brake does not apply correctly Electrically-controlled parking brake releases unexpectedly The hill start assist is not working
Suspect areas	Built-in systems interface

Fault Code	U2000
After sales description of the fault code	Fault - main triggering status word reception anomaly: Data invalid
Description of the diagnostics	Information too short Missing info
Conditions of activation of the diagnostics	Ignition on
Conditions of disappearance of the fault	-
Down-grade modes if fault present	No back-up mode
Switching on of the warning lamp and/or warning message	Warning lamp - "a": Not on - "b": Not on - "c": Not on
Main customer complaints likely	Illumination of LED/Error message Electrically-controlled parking brake does not apply correctly Electrically-controlled parking brake releases unexpectedly The hill start assist is not working
Suspect Areas	Built-in systems interface

The lamps referred to above are:

EPB Messages.PNG

[lenny1972]

Ok leave it with me - the first screen shot is just saying there is no communication with the directional headlights or the multifunction screen ECUs. That should have nothing to do with the parking brake - however, I do need to ask if you have replaced/ changed / upgraded the car audio system / head unit?

I will study the other errors and report back shortly.

No, I didn't replace neither the audio system or the head unit

[GiveMeABreak]

Lenny, did you see my other post:
viewtopic.php?f=3&t=53941&start=15#p586422

That is what is supposed to be done if replacing the Electric Parking Brake.

Was the battery disconnected before the new brake was fitted?

If the recalibration fails, you can try the BSI reset:

Here’s the BSI Reset / Battery Disconnect / Reconnect Procedure for reference:

[lenny1972]

I've seen your previous post and I've performed the EPB calibration procedure some time ago for several time. Anyway I'll try to re-calibrate the EPB in this days and if it doesn't work I'll try a BSI reset with the procedure described above. I'll let you know

[lenny1972]

So, here I am.
unfortunately I don't have good news.
I've performed with DIABOX both the parking brake recalibration procedure and (following your detailed description) the BSI reset procedure.

After the parking brake re-calibration procedure (and the cancellation of all the errors of the ESP and EPB) I perform a second global test that gave me this errors:
for EPB (FSE) ECU just 2 errors (even if the Diagbox says that the information could be partial because the EPB ECU was not recognised):
- U1213 Difetto assenza di comunicazione con il calcolatore del controllo di stabilità (ESP).
- U2000 Difetto ricezione messaggio di attivazione principale da parte del calcolatore elettronico
di gestione

NOTE: the strange things is that after the cencellation of the ESP errors the global tes didn't find any error..

Then I perform a BSI reset as per your instruction. After the BSI reset I perform a new global test that gave me the following errors:

for the BSI ECU 1 error:
- F5FF Difetto reinizializzazione intempestiva del calcolatore elettronico di gestione (is the first time the Diagbox gave me this error... Can this error depend on the BSI reset procedure performed?? )

for the ESP81 ECU 2 errors :
- U1219 Difetto attivazione automatica del freno di stazionamento con comando elettrico (FSE)
- U2119 Difetto - anomalia ricezione parola stato attivazione Funzione attivazione automatica
del freno di stazionamento con comando elettrico (FSE)

for EPB (FSE) ECU 5 errors:
- U1118 Difetto di comunicazione con la scatola di servitù intelligente(BSI)
- U1313 Difetto assenza di comunicazione con il calcolatore del controllo di stabilità (ESP)
- U1108 Difetto assenza di comunicazione con il calcolatore di controllo motore e il calcolatore
di controllo ibrido(se è presente il calcolatore di controllo ibrido)
- U2000 Difetto ricezione messaggio di attivazione principale da parte del calcolatore elettronico
di gestione
- U1213 Difetto assenza di comunicazione con il calcolatore del controllo di stabilità (ESP).

NOTE: the test says that the EPB ECU is not recognised. As you told me this is surely the reason why I've got all this errors..

What I sincerely didn't understand is why in the two global test sessions the errors on the EPB differ (after the re-calibration just 2 errors while after the BSI reset 5 errors) even if for all the two tests the EPB ECU was declared as "not recognised"

In some forums I've read about people having my same car (with similar problems) that solved this by reviewing the contacts on the BSI.. Even if the problem in my case appeared after the replacing of the EPB, do you think it's possible to investigate for false-contacts on the cables connecting the BSI to the other ECU (and specifically the EPB and ESP)?? I remember that one of the first errors (after replacing the EPB) was a malfunction of the ESP/ABS too (even if now this error is not more showed on the main car display)...Can this be a clue for you?

[GiveMeABreak]

Ok, I'll have to check on those errors Lenny.

It is always important to run a Global Test, make a note of any errors, then clear the faults, and re-run a Global Test again. You may want to take the car for a quick drive before running the second Global Test - this will allow the systems to operate and report any recurring faults that can't always be detected when the car is not being froven like the ESP system.

Let me check up on those codes and I'll report back shortly.

Ok so all those codes still point to the ESP ECU and Electronic Parking Brake - the suspect areas are the Connectors, the Line CAN, the ESP ECU, or the Parking Brake ECU. The BSI error is non-descriptive and just mean an unexpected reinitialisation of the BSI.

There's little else I can suggest at this point Lenny - short of re-tracing all your steps during the repair when the parking brake was fitted. I would get all the electrical connections and plugs re-checked and ensure that all the connectors are secure and have not bee left unplugged - it may sound simple, but this won't be the first time that this has happened where work undertaken in an area of the vehicle resulted in a disturbed electrical plug, or connector that was not plugged back in during the repair causing mayhem, or was knocked during the repair process.

If the communication data lines are not functioning then this would explain all the data errors and anomalies - so too early to start suspecting the BSI and the Engine ECU, the ESP ECU and the Parking Brake ECU! They cannot all be faulty - but the common factor between all of these is the electrical connections / wiring.

That is what I would do first of all. After that, I can't really suggest anything else except a qualified auto electrician familiar with multiplexed CAN networks - or a dealer.

[Trainman]

Finally managed to get the handbrake working again on Sunday.

Following the procedure set out here:https://www.frenchcarforum.co.uk/forum/ ... =3&t=53941 we managed to get the cable released, however, there wasn't enough length to connect the cable to the caliper, so, we stripped the brakes down and rewound the caliper completely back on both sides. then we connected the cable.

then using diagbox, we recalibrated the the handbrake, however, although diagbox was saying that the handbrake was calibrating, we kept getting a fault reported, so in a moment of madness, we pulled the emergency release in the centre console and then did a recalibration again, this time you could hear the handbrake moving on and off. The problem remained of the handbrake still being disabled.

In another moment of madness, i turned the car off, locked the doors, 10 secs later opened the doors, turned the engine on and no lights of any kind. I've driven it yesterday and today and the handbrake is working perfectly normally.

I can't thank Marc and everybody enough for their help and patience.

[GiveMeABreak]

Well done, sometimes it takes a few attempts as timing, battery condition, Data Network status can all affect the outcome.

[cenk]

ok, thank you so much for informing

[Mimi]

Hi, I have a problem with my parking brake, error is Parking brake faulty and the Anti-roll bar faulty, faulty code is C1552 (some Force Sensor on the parking brake), when they turn off on diagnostic it works until I start driving and apply the brake, then report the errors again. Can anyone help me what to do, the last thing is to buy a new one.

[GiveMeABreak]

Here's the fault code for C1552.

Key

Switching on of the warning lamp and/or warning message:
"a" : Electric parking brake fault warning lamp
"b" : Electric parking brake warning lamp
"c" : Service warning lamp

Fault Code:	C1552
Description of Fault:	Force sensor fault: Coherence. Incorrect calibration of the effort sensor. Fault is flagged on activation of the electrically-controlled parking brake
Conditions for Fault to clear:	Successive activations of the electrically-controlled parking brake
Downgrade Modes whilst Fault is active:	Deactivation of automatic mode No application Warning Lamps active (see Key above): Warning lamp - "a": lit - "b": On for 10 seconds after the request for application - "c": lit
Symptoms:	Illumination of LED/Error message Electrically-controlled parking brake does not apply correctly Electrically-controlled parking brake releases unexpectedly
Suspect Areas:	Force sensor (Internal electrically-controlled parking brake) Electric parking brake

Here is the sensor inside the EPB:

"a" Magnetic target.
"b" Integrated force sensor.
"c" spring.

The force sensor is of the HALL effect type and is integrated into the EPB.

The force sensor's job is to measure the force applied by the handbrake mechanism on the rear brake caliper cables.

• The magnetic target "a" is connected to the rear left secondary cable.
• A spring "c" stretches to hold the secondary cable in the released position.
• The calibration value of the spring "c" is recorded in the electric handbrake ECU.
• When the handbrake is applied, the movement of the secondary cable compresses the spring "c".
• The movement of the magnetic target "a" is measured by the sensor "b" integrated in the electronic card.
• The electric handbrake ECU compares the value of the movement of the secondary cable with the calibration value of the spring "c" to calculate the force applied to the calipers.

The sensor is not available as a separate part from PSA. So if this problem is becoming a permanent issue, the whole unit may need replacing, unless you can source a second hand unit and keep it for spares.

What you might want to try is to release the handbrake and then try re-apply the handbrake holding the handbrake electronic control up for 10 seconds - this will apply maximum force. Then release it again and try applying it normally with just one normal lifting of the control. It's possible that if the rear pads have been replaced or the rear calipers, that the mechanics did not release the handbrake mechanism using a diagnostic tool to fully release the cables. After, there is a re-attachment procedure that is done using Diagbox to ensure they are properly re-attached and calibrated.

I've not heard of this specific sensor failing before - but it's possible of course.

[Mimi]

Thank you very much Marc, I will check this plastic sensor today to see in what condition is.

[Guntis]

Hello!
Writing for the first time in this group and on the issue of electronic brakes. I own 2008. Citroen C5, 2.0 HDI diesel. We had terrible mines in our city (day -10 and night -12) and I was parked in the arc for about 4 days with the electric brake left on, came the day I came to the car and couldn't unlock it or else, and because she's stuck there, she's standing too. I have to ask you, or as time goes by, when will these handbrake motorinas freeze and Saks funkcionode, or have to change these Motorinas locally.

Thank you straight away if someone answers with an idea:) have a nice day!

[GiveMeABreak]

Hi, perhaps you can use Google translate if English is not your native language as I can't make out some of your post and even trying, the translator is not helping.

From what I can tell, you have left your vehicle parked for a few days and can't release the handbrake? A weak car battery will do and if it is already weak, leaving it for a few days can drain the battery significantly. This is because there are electronic systems that drain power when the car is not in use. If you can access the vehicle, then you can release the bonnet and can start the vehicle with a jump start, after which there should be enough current to release the parking brake.

If this is not possible, then you can use the emergency handbrake release cable that is inside the central glovebox under the rubber mat. Pulling this will release the handbrake. Read the handbook regarding this and on resetting it.