Hello,
I try to turn to this forum, because my C5 III X7 (2014 HDI Excl.) has a very special problem, maybe someone can help;
in the German forum there’s nearly nobody, who has similar trouble.
Code ‘C1555’ (only), manual brake-switching doesn’t work, automatic on/off is working as it should, P-Symbol displayed permanently, nothing else.
Already done:
Battery renewed, all fuses checked and cleaned, wires so far as possible checked, manual-switch renewed, brake-unit renewed (!, >1000 Euro).
Result: Still the same trouble. Since I don't have access to a wiring diagram I can't get any further now.
Is there anyone who knows more about the wiring, respectively how to go on ?
Thanks,
Clive
C5 III X7, fail of manual brake-function
Moderator: RichardW
-
- Posts: 6911
- Joined: 21 Sep 2002, 19:07
- x 738
Re: C5 III X7, fail of manual brake-function
What is your VIN & i can see if i have the wiring diagram available?
-
- Posts: 6
- Joined: 03 Jan 2023, 09:57
Re: C5 III X7, fail of manual brake-function
Hello Wheeler,
VIN is VF7**************[VIN obfuscated, can be read by forum staff]
Thanks in advance !
VIN is VF7**************[VIN obfuscated, can be read by forum staff]
Thanks in advance !
-
- Posts: 6911
- Joined: 21 Sep 2002, 19:07
- x 738
Re: C5 III X7, fail of manual brake-function
Hi, got the VIN but wont be able to check for a diagram till i get home later tonight.
-
- Posts: 6
- Joined: 03 Jan 2023, 09:57
Re: C5 III X7, fail of manual brake-function
No problem;
Thanks a lot for your effort !
Thanks a lot for your effort !
-
Online
- Forum Admin Team
- Posts: 37592
- Joined: 15 Sep 2015, 19:38
- x 5778
Re: C5 III X7, fail of manual brake-function
I've tidied up this thread and deleted the non-relevant posts.
This is the fault code. Diagram to Follow:
7092: electric handbrake / control
7095: electric handbrake assembly /
This is the fault code. Diagram to Follow:
Fault Code: | C1555 |
Description of Fault: | Activation/deactivation control fault of the electrically-controlled parking brake : Short circuit to positive or short circuit to earth.
|
Conditions for Fault to clear: | Disappearance of the push button fault. |
Downgrade Modes whilst Fault is active: | No manual application or release. Switching on of the warning lamp and/or warning message Warning lamp: - "a" : lit - "b" : Not on - "c" : Not on |
Symptoms: |
|
Suspect Areas: |
|
7092: electric handbrake / control
7095: electric handbrake assembly /
Please Don't PM Me For Technical Help
Marc
Marc
-
- Posts: 6
- Joined: 03 Jan 2023, 09:57
Re: C5 III X7, fail of manual brake-function
Thanks a lot, GiveMeABreak !
My DIAGRA also showed the comment
'Activation/deactivation control fault of the electrically-controlled parking brake : Short circuit to positive or short circuit to earth.',
your code-explanation is more detailed.
So contacts 4,5,9,10 of the brake switch(es) are just connected directly with the black brake-unit at the rear axle
(= 7095/'electric handbrake assembly' ?) - is this correct ? Unfortunately I wasn't an A-pupil in English-lessons ...
My DIAGRA also showed the comment
'Activation/deactivation control fault of the electrically-controlled parking brake : Short circuit to positive or short circuit to earth.',
your code-explanation is more detailed.
So contacts 4,5,9,10 of the brake switch(es) are just connected directly with the black brake-unit at the rear axle
(= 7095/'electric handbrake assembly' ?) - is this correct ? Unfortunately I wasn't an A-pupil in English-lessons ...
-
- Posts: 6
- Joined: 03 Jan 2023, 09:57
Re: C5 III X7, fail of manual brake-function
assembly=Baugruppe,
understood
understood
-
- Posts: 6911
- Joined: 21 Sep 2002, 19:07
- x 738
Re: C5 III X7, fail of manual brake-function
Correct.
It looks like pins 1,2 & 3 are only for the LED lamps inside the switch although pin 1 of the switch shares an earth connection with pin 2 of the handbrake control unit.
-
- Posts: 6
- Joined: 03 Jan 2023, 09:57
Re: C5 III X7, fail of manual brake-function
Since the LEDs are working it just could be broken/bitten wires 4430..4433 or their contact to car-body.
Earth and Voltage are not needed for switch-signals, as far as I see.
Furthermore there is no hidden relais or socket/plug to check, good news.
I have to remove the covers from the underbody to check the harness a bit more; I will report about results.
Thank you very much !
Earth and Voltage are not needed for switch-signals, as far as I see.
Furthermore there is no hidden relais or socket/plug to check, good news.
I have to remove the covers from the underbody to check the harness a bit more; I will report about results.
Thank you very much !
-
- Posts: 1
- Joined: 25 Apr 2024, 10:09
Re: C5 III X7, fail of manual brake-function
It was a C5 (2015) fault with manual braking 7092: electric handbrake / steering / 7095: electric handbrake assembly / wire 10 across the protective tube. About 10 cm from the connector to the electrical assembly. Wire 4430.